Molecular Docking, 3D QSAR and Designing of New Quinazolinone Analogues as DHFR Inhibitors
|
|
- Alban Warner
- 5 years ago
- Views:
Transcription
1 Molecular Docking, 3D QSAR and Designing of New Quinazolinone Bull. Korean Chem. Soc. 2011, Vol. 32, No DOI /bkcs Molecular Docking, 3D QSAR and Designing of New Quinazolinone Analogues as DHFR Inhibitors L. Yamini, K. Meena Kumari, and M. Vijjulatha * Department of Chemistry, Nizam College, Osmania University, Hyderabad , India * vijjulathamanga@gmail.com Received January 10, 2011, Accepted June 1, 2011 The three dimensional quantitative structure activity relationship (3D QSAR) models were developed using Comparative molecular field analysis (CoMFA), comparative molecular similarity indices analysis (CoMSIA) and docking studies. The fit of Quinazolinone antifolates inside the active site of modeled bovine dihydrofolate reductase (DHFR) was assessed. Both ligand based (LB) and receptor based (RB) QSAR models were generated, these models showed good internal and external statistical reliability that is evident from the q 2 loo, r 2 ncv and r 2 pred. The identified key features enabled us to design new Quinazolinone analogues as DHFR inhibitors. This study is a building bridge between docking studies of homology modeled bovine DHFR protein as well as ligand and target based 3D QSAR techniques of CoMFA and CoMSIA approaches. Key Words : Dihydrofolate Reductase (DHFR), Three dimensional quantitative structure activity relationship (3D QSAR), Ligand Based (LB), Receptor Based (RB), Comparative molecular field analysis (CoMFA), Comparative molecular similarity indices analysis (CoMSIA) Introduction Dihydrofolate reductase enzyme catalyzes the reduction of 7,8-dihydrofolate (DHF) to 5,6,7,8-tetrahydrofolate (THF) by stereo specific hydride transfer from the NADPH cofactor to the C 6 atom of the Pterin ring with concomitant protonation of N 5 atom. DHFR plays a central role in the maintenance of cellular pools of THF and its derivatives which are essential for Purine and Thymidine synthesis and hence for cell growth and proliferation. This enzyme has been the target of important anticancer drugs and antibiotics. 1,2 Quinazolinone skeleton is a frequently encountered heterocyclic moiety in medicinal chemistry with applications including antibacterial, 3 analgesic, 4 anti-inflammatory, 5,6 antifungal, 7 anti malarial, 8 anti hypersensitive, 9 CNS depressant, 10 anticonvulsant, 11 antihistaminic and local anesthetic, 12 anti Parkinson s, 13 antiviral 14 and anticancer. 15 S.T. Al- Rashood et al. 16 synthesized and tested the biological activities of Quinazolinone molecules on bovine DHFR, but the docking studies were done on hdhfr. Since the pharmacological activities of the inhibitors were determined on the bovine DHFR, the enzyme should be bovine DHFR instead of human DHFR (hdhfr) for performing molecular modeling studies. Based on this statement bovine DHFR was considered for our study. The difference between the bovine and human DHFR was an incremental change in the amino acid chronological order. Docking studies were performed on modeled bovine DHFR, in order to investigate the interactions between the inhibitors and the target, bovine DHFR was modeled using mouse DHFR as a template. In this study, lower energy conformation with atom fit alignment (ligand-based LB) and docking conformation (receptorbased RB) were used to build 3D QSAR models. Partial least square (PLS) 17,18 based statistical analysis was carried out on 44 molecules to identify the correlation. The contour maps generated enabled us to design new molecules. Experimental Section FASTA sequence of bovine DHFR residues with accession code of P00376 was retrieved from swiss-port database server. 19 The sequence when subjected to the basic local alignment search tool (BLAST) by setting the server to search the protein data bank. 20 Sequence identity, E values (a statistical measure) and secondary structure similarities were used as constraints during the selection of the template. Pair wise alignment was carried out with Clustal X to define conserved regions, identities, similarities and differences, between the target and the template. 21 The mouse DHFR shared a sequence similarity of 88% with bovine DHFR with identical sequence of amino acids except for the increase in one digit in the chronological order of the amino acids. The active site of the hdhfr represents Ile-7, Ala-9, Trp-24, Glu-30, Gln-35, Asn-64, Arg-70, Val-115, Tyr-121 and Thr- 136 and bovine DHFR active site is represented by Ile-8, Ala-10, Trp-25, Glu-31, Gln-36, Asn-65, Arg-71, Val-116, Tyr-122 and Thr The homology models were generated using MODELLER 8v2. 23,24 The low energy conformation of the protein structure of bovine DHFR was analyzed with PROCHECK, 25 Verify 3D 26,27 and PROSA. 28,29 The built model with > 80% sequence similarity with the template is equivalent to the low resolution X-ray crystal structure. 30 The active sites of both the crystal structure and modeled protein had similar binding pockets, bovine DHFR was considered for molecular docking. A set of 44 molecules with reported IC 50 values for
2 2434 Bull. Korean Chem. Soc. 2011, Vol. 32, No. 7 L. Yamini et al. Table 1. Structures of Molecules used in the 3D QSAR study Table 1. Continued Mol.No IC 50 (µm) pic 50 R 1 R 2 R 3 Core Structure-1 Mol.No IC 50 (µm) pic 50 R 1 R 2 R 3 Core Structure Et H 6-NO Ph H 6-NO Bn H 6-NO Bn H 7-NO Et CH 3 6-NO Ph CH 3 6-NO Bn CH 3 6-NO Bn CH 3 7-NO Ph CH 3 6-NH Bn CH 3 7-NH 2 Core Structure Bn 4-OCH 3-12 * Ph 3,4-OCH Bn 3,4-OCH Ph 3,4,5-OCH Bn 3,4,5-OCH 3 - Core Structure Bn H 4-OCH Ph H 3,4-OCH Bn H 3,4-OCH Ph H 3,4,5-OCH Bn H 3,4,5-OCH Ph CH 3 4-OCH Bn CH 3 4-OCH Ph CH 3 3,4-OCH Bn CH 3 3,4-OCH Ph CH 3 3,4,5-OCH 3 Core Structure Ph H Bn H Ph Br Bn Br Ph CH Bn CH 3-32 * Ph Et - 33 * Bn Et - 34 * Ph Bn Bn Bn - Core Structure Ph H Bn H Ph 4-Br Bn 4-Br Ph 4-CH 3-41 * Bn 4-CH 3-42 * Ph 4-OCH 3-43 * Bn 4-OCH 3-44 * Bn 3,4-OCH 3 - pic 50 = log IC 50. *represents molecules taken for test set, Ph = Phenyl and Bn = Benzyl inhibition of bovine DHFR activity, 16 were taken and converted to corresponding pic 50 values (Table 1). The dataset was divided into training set of 36 molecules and test set of 8 molecules. All molecular modeling calculations were performed on Linux operating system. Three dimensional structure building and all modeling studies were performed using Sybyl 6.9 molecular modeling program package. 31 Gasteiger-Huckel 32 charges were assigned and then energy minimization of each molecule was performed using conjugate gradient method and tripos standard force field 33 with a distance dependant dielectric function. The minimization was terminated when the energy gradient convergence criterion of kcal/mol/å was reached The protein was minimized using conjugate gradient method and tripos standard force field was applied after adding all hydrogen atoms. The minimization was terminated when the energy gradient convergence reached to 0.05 kcal/mol/å. FlexX 37 was used for molecular docking. The analysis of dock poses of all the molecules showed limited interactions with the active site residues with amino acids like ASN65 and ARG71. Ligand based alignment was based on the lowest energy conformation of molecule 23 in the series. The receptor based alignment process is a standard rigid RMSD overlay of selected common structural motive, where the docked poses of the most active molecules was used as template onto which the data set was aligned. 38 The alignment was done using ALIGN DATABASE command in Figure 1. Common substructure used for alignment.
3 Molecular Docking, 3D QSAR and Designing of New Quinazolinone Bull. Korean Chem. Soc. 2011, Vol. 32, No performed by the leave-one-out (LOO) procedure to determine the optimum number of components (ONC) and the coefficient q 2. The optimum number of components obtained is then used to derive the final QSAR model using all of the training set compounds with non-cross validation and to obtain the conventional correlation coefficient (r 2 ). To validate the CoMFA and CoMSIA derived models, the predictive ability for the test set of compounds (expressed as r 2 pred) was determined by using the following equation: r 2 pred = (SD PRESS)/SD Figure 2. Alignment of data set molecules based on common substructure using compound 23 as a template. (a) Receptor based alignment. (b) Ligand based alignment. Sybyl 6.9 taking the substructure that is common to all (Fig. 1). The resultant alignment is shown in Figure 2. Standard Tripos force field was employed for the Comparative Molecular Field Analysis (CoMFA) 39 and Comparative Molecular Similarity Indices (CoMSIA) 40,41 analysis. A 3D cubic lattice overlapping all entered molecules and extended by at least 4 Å in each direction with each lattice intersection of a regularly spaced grid of 2.0 Å was created. The steric and electrostatic parameters were calculated in case of the CoMFA fields, while hydrophobic, H-bond acceptor and H-bond donor parameters in addition to steric and electrostatic were calculated in case of the CoMSIA fields at each lattice. A sp 3 hybridized carbon atom was used as a probe atom to generate steric (Lennard-Jones potential) field energies and a charge of +1 to generate electrostatic (Coulombic potential) field energies. A distance dependent dielectric constant of 1.00 was used. The steric and electrostatic fields were truncated at kcal/mol. The similarity indices descriptors were calculated using the same lattice box employed for CoMFA calculations, using sp 3 carbon as a probe atom with a +1 charge, +1hydrophobicity and +1 H- bond donor and +1 H-bond acceptor properties. A partial least squares regression was used to generate a linear relationship that correlates changes in the computed fields with changes in the corresponding experimental values of biological activity (pic 50 ) for the data set of ligands. Biological activity values of ligands were used as dependent variables in a PLS statistical analysis. The column filtering value (s) was set to 2.0 kcal/mol to improve the signal-tonoise ratio by omitting those lattice points whose energy variations were below this threshold. Cross-validations were SD is the sum of the squared deviations between the biological activities of the test set molecules and the mean activity of the training set compounds. PRESS is the sum of the squared deviation between the observed and the predicted activities of the test set compounds. Since the statistical parameters were found to be the best for the model from the LOO method, it was employed for further predictions of the designed molecules. The designed molecules were also constructed, minimized and docked into the protein active site, as mentioned above. Results and Discussion This section has been divided into discussion of the results from homology modeling, active site identification, QSAR results, contour map analysis and designing of new molecules. During this study no crystallographic data for bovine DHFR was available. Sequence homologous to bovine DHFR having 187 amino acid residues was obtained from the BLAST server with corresponding E values for mouse being and for human as A low E- value indicates a high protein sequence identity. 42 The mouse DHFR (pdb id: 2FZJ; 2.5 Å) was taken as the template protein based on E-value and maximum sequence alignment. Alignment of bovine DHFR protein with the template protein gave a sequence identity of 89% and a sequence similarity of 93%. The initial homology models were generated using MODELLER 8v2. A Ramachandran contour plot of phi (Φ) verses Psi (Ψ) (backbone dihedral angles) for the modeled low energy conformer of bovine DHFR protein, along with plot statistics is shown in Figure 3. Among the 187 amino acids, 128 were in the most favored region, 31 residues in additionally allowed region, 0 residues in generously allowed and one in the disallowed region excluding glycine and proline. This shows that the model generated was stereo chemically valid. The PROSA II server gave pair wise energy and surface energy values based on the mean force potential (a distance based pair potential) as a function of amino acid sequence. Amino acid residues with negative PROSA energies are more reliable and most of the amino acid residues of bovine DHFR had negative energies. The overall Z-score was 8.86 when compared with the Z-score of 8.71 for the template.
4 2436 Bull. Korean Chem. Soc. 2011, Vol. 32, No. 7 L. Yamini et al. Table 2. PLS results summary Statistical Parameters CoMFA Model Ligand based 2 Receptor based CoMSIA Model Ligand based q Molecules in training set Molecules in test set ONC r SEE F r Fraction of Field Contributions: Steric Electrostatic Hydrophobic Acceptor loo 2 ncv 2 pred Receptor based q2loo = cross-validated correlation coefficient by leave one out method, r2ncv = conventional corrélation coefficient, ONC = optimum number of components, SEE = standard error of estimate, F = Fisher test value, r2pred = cross-validated correlation coefficient on test set PROCHECK Ramachandran plot quality Model (a) Template (b) Core Allowed General Disallowed Figure 3. Ramachandran map: (a) 1FZJ template and (b) Bovine homology model. Sequence similarity > 80% between the template and the target is equivalent to medium resolution NMR or low resolution crystal structure, that can be used directly for docking small molecules into the protein active site.30 Active site residues of the bovine DHFR were obtained from NCBI database and further confirmed by SITEID option in Sybyl 6.9. Receptor description file (RDF) was created within the area of 5.0 Å around the active site cavity. The active site residues include ILE-8, ALA-10, TRP-25, GLU-31, GLN36, ASN-65, ARG-71, VAL-116, TYR-122 and THR Six different set of quinazolinone core molecules (shown in Table 1 along with IC50 and pic50 values) were docked into the active site, they showed maximum two hydrogen bond interactions with the active site residues. The 3D QSAR CoMFA and CoMSIA analysis were carried out using quinazolinone derivatives reported as potent inhibitors for bovine DHFR.16 Molecules having precise IC50 values were selected and the molecules that did not show interactions with the protein active site (via docking) were removed from the dataset. A set of 44 molecules were used for derivation of model, these were divided into training set of 36 molecules and test set of 8 molecules. The CoMFA and CoMSIA statistical analysis are summarized in Table 2. Statistical data shows q2loo and for CoMFA ligand based (LB) and receptor based (RB), and for CoMSIA LB and RB respectively. The r2ncv of and for CoMFA ligand based (LB) and receptor based (RB), and for CoMSIA LB and RB respectively, that includes a good internal predictive ability of the models. To test the predictive ability of the models a test set of eight molecules excluded from the model generation were used. The predictive correlation coefficient r2pred of and for CoMFA LB and RB, and and for the CoMSIA models respectively indicates good external predictive ability of the models. The graph for the actual and predicted pic50 values for training set and test of CoMFA LB and RB studies are shown in Figure 4(a), (b) and CoMSIA LB and RB studies shown in Figure 4(c), (d). The CoMSIA models showed better results than CoMFA models, this shows that the hydrophobic fields which were not included in the CoMFA model are important for explaining the potency of the molecules. The observed and
5 Molecular Docking, 3D QSAR and Designing of New Quinazolinone Bull. Korean Chem. Soc. 2011, Vol. 32, No Figure 4. (a)-(d) Scatter Plot of experimental vs. predicted pic 50 (test set is represented as triangles). (a) Ligand based CoMFA. (b) Ligand based CoMSIA. (c) Receptor based CoMFA and (d) Receptor based CoMSIA. Table 3. Data set used for 3D QSAR analysis with corresponding actual and predicted activities for LB and RB CoMFA and CoMSIA values Mol. No Obs. Activity LB Predicted Activity RB Predicted Activity CoMFA CoMSIA CoMFA CoMSIA * Table 3. Continued Mol. No Obs. Activity LB Predicted Activity RB Predicted Activity CoMFA CoMSIA CoMFA CoMSIA * * * * * * *
6 2438 Bull. Korean Chem. Soc. 2011, Vol. 32, No. 7 L. Yamini et al. Figure 5. (a)-(d) Steric contour maps for both ligand and receptor based CoMFA and CoMSIA. (a) & (b) Contours for ligand and receptor based CoMFA (c) & (d) Contours for ligand and receptor based CoMSIA. predictive ability of the molecules are provided in Table 3. To visualize the information content of the derived 3D QSAR models, CoMFA and CoMSIA contour maps were generated. The contour plots are the representation of the lattice points and the difference in the molecular field values at lattice points, strongly connected with difference in the receptor binding affinity. Molecular fields define the favorable or unfavorable interaction energies of aligned molecules with a probe atom traversing across the lattice plots suggesting the modification required to design new molecules. The contour maps of CoMFA denote the region in the space were the molecules would favorably or unfavorably interact with the receptor, while CoMSIA contour maps denote areas within the specified region where the presence of a group with a particular physicochemical property binds to the receptor. The CoMFA and CoMSIA results were graphically interpreted by field contribution maps using the STDEV COEFF field type. Compound 23 the most potent inhibitor among the series was displayed on the maps for visualization. Figure 5(a)-(d) shows the contour maps for LB and RB CoMFA and CoMSIA steric fields with default 80 and 20% level contributions, steric maps of these two models were similar. In the steric contours green and yellow represent favorable and unfavorable respectively. Yellow contour near R 1 substituent indicates steric bulk would decrease the activity and green contour near R 2 substituent indicates steric favored region that accentuates the inhibitory activity by increasing the bulkiness. This is evident from the activity variations seen in different structures. Compounds have maximum activity due to presence of methyl group as R 2 substituent. Where as in Figure 6. (a) Electrostatic contour maps for ligand based and (b) receptor based CoMFA, regions favored for electropositive groups shown in blue where as regions favored for electronegative groups shown in red.
7 Molecular Docking, 3D QSAR and Designing of New Quinazolinone Bull. Korean Chem. Soc. 2011, Vol. 32, No Figure 7. Hydrophobic contour maps of (a) ligand based and (b) receptor based. Yellow contour represents hydrophobic favored regions and white contour represents hydrophobic disfavored. (c) ligand based and (d) receptor based CoMSIA. Purple contour for acceptor favored and red contour for acceptor disfavored. compounds the presence of hydrogen atom a less bulky group has decreased the activity. To satisfy the steric bulkiness at this region, glutamic acid has been substituted that showed maximum hydrogen bond interactions with the active site, hence increasing the activity. Electrostatic contour maps for both LB and RB CoMFA are shown in Figure 6(a) & (b) with field contributions of 90 and 10% for favored and disfavored respectively. The blue and red contours depict the position where positively charged groups and negatively charged groups would be beneficial to inhibitory activity. This can be depicted in the compound where CH 3 group has been introduced on the core structure 3 in the positive favorable contour at region B are better than, respectively compound There is a disparity between the LB and RB CoMFA in the red contour region. There is a large red contour found Figure 8. Structures of newly designed molecules by change in substitutions at R 1 Region named Q 1 and Q 2. Change in substitution at R 1 and R 2 region named Q 3-Q 8.
8 2440 Bull. Korean Chem. Soc. 2011, Vol. 32, No. 7 L. Yamini et al. Table 4. Dock score and predicted activity and calculated IC 50 values of newly designed molecules Molecule No. Ligand Based Receptor Based CoMFA CoMSIA CoMFA CoMSIA Calculated IC 50 (µm) Q Q Q Q Q Q Q Q around the region B in the LB CoMFA suggesting an electronegative group will increase the activity. In contrary to the LB CoMFA the red contour has been shifted away from this region in RB CoMFA, suggesting a flipping in methylene group for better interaction with the receptor binding site. The hydrophobic fields were represented in Figure 7(a) & (b) with field contributions of 90 and 10% for favored and disfavored respectively. Yellow and white contours highlighted areas where hydrophobic and hydrophilic properties were preferred respectively. A large yellow patch at R 2 substituent in core 3, suggesting a hydrophobic group like a methyl increases the activity. The phenyl group at R 1 in core 3 is protruding into the hydrophilic region that would decrease the activity of the molecules. Suggesting an hydrophilic group at this region would still increase the activity. This was taken care while designing the new molecules where small hydrophilic groups like C 2 H 5 OH, CH 3 NH 2 and CH 3 COOH were used to replace phenyl ring, inorder to increase the activity. Hydrogen bond acceptor contour maps for both ligand and receptor based CoMSIA models are shown in Figure 7(c) & (d) with filed contributions of 90 and 10% for favored and disfavored respectively. The red contour indicates disfavored for hydrogen bond acceptor and purple indicates favored for hydrogen bond acceptor hence the presence of CH 3 group in region B of core-3 at red contour showed highest activity. The detailed contour map analysis of both CoMFA and CoMSIA models empowered us to identify structural requirements for the observed inhibitory activity. The analogues were designed to improve the inhibitory activity. The best Figure 9. (a) Modeled protein overlapped with the template (Ribbon form) incorporated with the active site amino acids (Balls and sticks) for template (red) and modeled (peach) protein respectively. (b) Illustrating the field contributions from 3D QSAR depicting steric (green and yellow) and electrostatic (blue and red) for the designed (Q6) molecule embedded in fig a. (c) Hydrogen bonding interactions of the newly designed molecule (Q 6) with the active site.
9 Molecular Docking, 3D QSAR and Designing of New Quinazolinone Bull. Korean Chem. Soc. 2011, Vol. 32, No active molecule has been taken as a reference structure to design new molecules (Fig. 8) and to obtain new potent inhibitors. The newly designed analogues when docked into the protein active site showed increased (6) hydrogen bond interactions (GLN36 (2), VAL116, TYR122, ASN65 (2)) with the active site and showed better dock score and predicted activity with respect to the reference compound (Table 4). In Figure 9, Q 6 molecule was embedded into the QSAR contours in the modeled protein overlapped with the template, showing hydrogen bond interactions with the active site amino acids. The predicted IC 50 values were calculated using the reverse formula of pic 50. IC 50 = e pic 50 It was found that the IC 50 values calculated had an increased activity ranging from 3 fold to 13 fold with respect to the reference molecule. Conclusion Bovine DHFR was modeled using mouse DHFR template having 89% sequence identity, this model has been validated using PROCHECK and PROSA II. The docking methodology has been used as a tool to explain the binding affinity of the newly designed molecules, both LB and RB methods are appropriate to build 3D QSAR models of quinazolinone derivatives. The established models showed good q 2 and r 2 pred values. Factors affecting the inhibitory activities are investigated by combining the contour maps and the results are in good accordance and complementary to each other. Bulky and hydrophobic groups at R 2 and small hydrophilic group at R 1 are preferred. The designed molecules based on these parameters showed better activity than the reference molecules, which indicates the 3D QSAR model generated has a good predictive ability and can be used to design potent inhibitors. All these results yield reliable and precious information for further structure based drug design optimization. Acknowledgments. We gratefully acknowledge support for this research from University Grants Commission, India, Department of Science and Technology, India and Department of chemistry, Nizam College, Hyderabad. We are greatly thankful to Dr. G. N. Sastry, Indian Institute of Chemical technology for Sybyl 6.9 software and his useful suggestions. We also thank Andrew Sali for the academic free license of MODELLER software. References 1. Trimble, J. J.; Murthy, S. C. S.; Bakker, A.; Grassmann, R.; Desrosiers, R. C. Science 1988, 239, Collin, J. Suckling, Enzyme Chemistry; Chapman and Hall Ltd.: 733 Third Avenue, NY, 1984; p Suresha, G. P.; Prakasha, K. C.; Kapfo, W.; Gowda, D. C. E-J Chem. 2010, 7(2), Alagarsamy, V.; Muthukumar, V.; Pavalarani, N.; Vasanthanathan, P.; Revathi, R. Biol. Pharm. Bull. 2003, 26(4), Mani, C. P.; Yakaiah, T.; Raghu, R. R. A.; Narsaiah, B.; ChakraReddy, N.; Sridhar, V.; Venkateshwara, R. J. Eur. J. Med. Chem. 2007, 42, Ravishankar, C. H.; Devender, R. A.; Bhaskar, R. A.; Malla, R. V.; Sattur, P. B. Curr. Sci. 1984, 53, Ouyang, G.; Zhang, P.; Xu, G.; Song, B.; Yang, S.; Jin, L.; Xue, W.; Hu, D.; Lu, P.; Chen, Z. Molecules 2006, 11, Martin, T. A.; Wheller, A. G.; Majewski, R. F.; Corrigan, J. R. J. Med. Chem. 1964, 7, Dienei, J. B.; Dowalo, F.; Hoeven, H. V.; Bender, P.; Loev, B. J. Med. Chem. 1973, 16, Jatav, V.; Mishra, P.; Kashaw, S.; Stables, J. P. Eur. J. Med. Chem. 2008, 4, Ilangovan, P.; Ganguly, S.; Pandi, V. J. Pharm. Res. 2010, 3, Chandrasekhar, V.; Raghurama, R. A.; Malla, R. V. Indian Drugs 1986, 3, Naithani, P. K.; Gautam, P.; Srivastava, V. K.; Shankar, K. Indian J. Chem. 1989, 28B, Magnus, N. A.; Confalone, P. N.; Storace, L.; Patel, M.; Wood, C. C.; Davis, W. P.; Parsons, R. L. J. Org. Chem. 2003, 68, Jantova, S.; Urbancikova, M.; Maliar, T.; Mikuldsova, M.; Rauko, P.; Cipak, L.; Kubikova, J.; Stankovsky, S.; Spirkova, K. Neoplasm. 2001, 48, Sarah, T. R.; Ihsan, A.; Aboldahab et al. Bio. Org. Med. Chem. 2006, 14, Klebe, G.; Abraham, U.; Mietzner, T. J. Med. Chem. 1994, 37, Wold, S.; Ruhe, A.; Wold, H.; Dunn, W. J. I. SIAM J. Sci. Stat. Comput. 1984, 5, Cavalli, A.; Greco, G.; Novelliono, E.; Recanatini, M. Boiorg. Med. Chem. 2000, 8, Boeckmann, B.; Bairoch, A.; Apwweiler, R.; Blatter, M. C.; Estreicher, A.; Gasteiger, E.; Martin, M. J.; Michoud, K.; O Doonovan, C.; Phan, I.; Pilbout, S.; Schneider, M. Nucl. Acids Res. 2003, 31, Altschul, S. F.; Thomas, L. M.; Alejandro, A. S.; Jinghui, Z.; Zheng, Z.; Miller, W.; Lipman, D. J. Nucleic Acids Res. 1997, 25, Balazs, J.; Arpad, M. J. Mol. Grap. and Model. 2007, 25, Sali, A.; Blundell, T. L. J. Mol. Biol. 1993, 234, Marti-Renom, M. A.; Stuart, A. C.; Fiser, A.; Sanchez, R.; Melo, F.; Sali, A. Annu. Rev. Biophys. Biomol. Struct. 2000, 29, Laskowski, R. A.; Mac, A. M. W.; Moss, D. S.; Thornton, J. M. J. Appl. Cryst. 1993, 26, Bowie, J. U.; Lüthy, R.; Eisenberg, D. Science 1991, 253, Lüthy, R.; Bowie, J. U.; Eisenberg, D. Nature 1992, 356, Wiederstein & Sippl Nucleic Acid Res. 2007, 35, W Sippl, M. J. Proteins 1993, 17, Sali, A.; Kurian, J. Trends Biochem. Sci. 1999, 22, M SYBYL Molecular Modeling System, version 6.9, Tripos Inc., St. Louis, MO, Gasteiger, J.; Marsili, M. Tetrahedron 1980, 363, Stitch, I.; Car, R.; Parrinello, M.; Baroni, S. Phys. Rev. B 1989, 39, Leach, A. Molecular Modelling, Principles and Applications; Longman: Harlow, Essex, England, Forcefield-Based Simulations; Accelerys, Corp.: San Diego, CA. Chapter 4, Minimization. 36. Jensen, F. Introduction to Computational Chemistry; John Wiley: Chichester, England, 1999; p 322.
10 2442 Bull. Korean Chem. Soc. 2011, Vol. 32, No. 7 L. Yamini et al. 37. Rarey, M.; Kramer, B.; Lengauer, T.; Kleb, G. A. J. Mol. Biol. 1996, 261, Balazs, J.; Arpad, M. J. Mol. Grap. And Model 2007, 25, Cramer, R. D., III.; Patterson, D. E.; Bunce, J. D. J. Am. Chem Soc. 1988, 110, Cramer, R. D., III.; Bunce, J. D.; Patterson, D. E. Quant. Struct. Act. Relat. 1988, 7, Klebe, G.; Abraham, U.; Mietzner, T. J. Med. Chem 1994, 37, Altschul, S. F.; Gish, W.; Miller, W.; Myers, E. W.; Lipman, D. J. J. Mol. Biol. 1990, 215, 403.
Molecular docking, 3D-QSAR studies of indole hydrazone as Staphylococcus aureus pyruvate kinase inhibitor
World Journal of Pharmaceutical Sciences ISSN (Print): 2321-3310; ISSN (Online): 2321-3086 Published by Atom and Cell Publishers All Rights Reserved Available online at: http://www.wjpsonline.org/ Original
More information3D-QSAR Studies on Angiotensin-Converting Enzyme (ACE) Inhibitors: a Molecular Design in Hypertensive Agents
952 Bull. Korean Chem. Soc. 2005, Vol. 26, No. 6 Amor A. San Juan and Seung Joo Cho 3D-QSAR Studies on Angiotensin-Converting Enzyme (ACE) Inhibitors: a Molecular Design in Hypertensive Agents Amor A.
More information5.1. Hardwares, Softwares and Web server used in Molecular modeling
5. EXPERIMENTAL The tools, techniques and procedures/methods used for carrying out research work reported in this thesis have been described as follows: 5.1. Hardwares, Softwares and Web server used in
More informationLigand-based QSAR Studies on the Indolinones Derivatives Bull. Korean Chem. Soc. 2004, Vol. 25, No
Ligand-based QSAR Studies on the Indolinones Derivatives Bull. Korean Chem. Soc. 2004, Vol. 25, No. 12 1801 Ligand-based QSAR Studies on the Indolinones Derivatives as Inhibitors of the Protein Tyrosine
More informationISSN: ; CODEN ECJHAO E-Journal of Chemistry 2009, 6(3),
ISS: 0973-4945; CODE ECJHAO E- Chemistry http://www.e-journals.net 2009, 6(3), 651-658 Comparative Molecular Field Analysis (CoMFA) for Thiotetrazole Alkynylacetanilides, a on-ucleoside Inhibitor of HIV-1
More information* Author to whom correspondence should be addressed; Tel.: ; Fax:
Int. J. Mol. Sci. 2011, 12, 946-970; doi:10.3390/ijms12020946 OPEN ACCESS Article International Journal of Molecular Sciences ISSN 1422-0067 www.mdpi.com/journal/ijms Structural Determination of Three
More informationT. J. Hou, Z. M. Li, Z. Li, J. Liu, and X. J. Xu*,
1002 J. Chem. Inf. Comput. Sci. 2000, 40, 1002-1009 Three-Dimensional Quantitative Structure-Activity Relationship Analysis of the New Potent Sulfonylureas Using Comparative Molecular Similarity Indices
More informationMolecular Modeling Study of Some Anthelmintic 2-phenyl Benzimidazole-1- Acetamides as β-tubulin Inhibitor
Sawant et al : Molecular Modeling Study of Some Anthelmintic 2-phenyl Benzimidazole-1-Acetamides as -tubulin Inhibitor 1269 International Journal of Drug Design and Discovery Volume 5 Issue 1 January March
More informationEnhancing Specificity in the Janus Kinases: A Study on the Thienopyridine. JAK2 Selective Mechanism Combined Molecular Dynamics Simulation
Electronic Supplementary Material (ESI) for Molecular BioSystems. This journal is The Royal Society of Chemistry 2015 Supporting Information Enhancing Specificity in the Janus Kinases: A Study on the Thienopyridine
More informationIntroduction to Comparative Protein Modeling. Chapter 4 Part I
Introduction to Comparative Protein Modeling Chapter 4 Part I 1 Information on Proteins Each modeling study depends on the quality of the known experimental data. Basis of the model Search in the literature
More informationIdentifying Interaction Hot Spots with SuperStar
Identifying Interaction Hot Spots with SuperStar Version 1.0 November 2017 Table of Contents Identifying Interaction Hot Spots with SuperStar... 2 Case Study... 3 Introduction... 3 Generate SuperStar Maps
More informationHologram and Receptor-Guided 3D QSAR Analysis of Anilinobipyridine JNK3 Inhibitors
3D QSAR Analysis of Anilinobipyridine JK3 Inhibitors Bull. Korean Chem. Soc. 2009, Vol. 30, o. 11 2739 Hologram and Receptor-Guided 3D QSAR Analysis of Anilinobipyridine JK3 Inhibitors Jae Yoon Chung,,
More information3D QSAR analysis of quinolone based s- triazines as antimicrobial agent
International Journal of PharmTech Research CODEN (USA): IJPRIF ISSN : 0974-4304 Vol.4, No.3, pp 1096-1100, July-Sept 2012 3D QSAR analysis of quinolone based s- triazines as antimicrobial agent Ramesh
More informationAnalogue and Structure Based Drug Designing of Prenylated Flavonoid Derivatives as PKB/Akt1 Inhibitors
Available online at www.ijpcr.com International Journal of Pharmaceutical and Clinical esearch 2016; 8(8): 1205-1211 esearch Article ISS- 0975 1556 Analogue and Structure Based Drug Designing of Prenylated
More informationHomology modeling of Ferredoxin-nitrite reductase from Arabidopsis thaliana
www.bioinformation.net Hypothesis Volume 6(3) Homology modeling of Ferredoxin-nitrite reductase from Arabidopsis thaliana Karim Kherraz*, Khaled Kherraz, Abdelkrim Kameli Biology department, Ecole Normale
More informationMohmed et al., IJPSR, 2016; Vol. 7(3): E-ISSN: ; P-ISSN:
IJPSR (2016), Vol. 7, Issue 3 (Research Article) Received on 23 September, 2015; received in revised form, 05 November, 2015; accepted, 17 December, 2015; published 01 March, 2016 3D-QSAR STUDY OF BENZOTHIAZOLE
More informationStudies of New Fused Benzazepine as Selective Dopamine D3 Receptor Antagonists Using 3D-QSAR, Molecular Docking and Molecular Dynamics
Int. J. Mol. Sci. 2011, 12, 1196-1221; doi:10.3390/ijms12021196 OPEN ACCESS Article International Journal of Molecular Sciences ISSN 1422-0067 www.mdpi.com/journal/ijms Studies of New Fused Benzazepine
More informationSelf-Organizing Molecular Field Analysis on a New Series of COX-2 Selective Inhibitors: 1,5-Diarylimidazoles
Int. J. Mol. Sci. 2006, 7, 220-229 International Journal of Molecular Sciences ISSN 1422-0067 2006 by MDPI www.mdpi.org/ijms/ Self-Organizing Molecular Field Analysis on a New Series of COX-2 Selective
More information* Author to whom correspondence should be addressed; Tel.: ; Fax:
Int. J. Mol. Sci. 2011, 12, 1807-1835; doi:10.3390/ijms12031807 OPEN ACCESS International Journal of Molecular Sciences Article ISSN 1422-0067 www.mdpi.com/journal/ijms Combined 3D-QSAR, Molecular Docking
More informationUsing Bayesian Statistics to Predict Water Affinity and Behavior in Protein Binding Sites. J. Andrew Surface
Using Bayesian Statistics to Predict Water Affinity and Behavior in Protein Binding Sites Introduction J. Andrew Surface Hampden-Sydney College / Virginia Commonwealth University In the past several decades
More informationJournal of Molecular Graphics and Modelling
Journal of Molecular Graphics and Modelling 30 (2011) 67 81 Contents lists available at ScienceDirect Journal of Molecular Graphics and Modelling journal homepage: www.elsevier.com/locate/jmgm Development
More informationStructural biology and drug design: An overview
Structural biology and drug design: An overview livier Taboureau Assitant professor Chemoinformatics group-cbs-dtu otab@cbs.dtu.dk Drug discovery Drug and drug design A drug is a key molecule involved
More informationModeling for 3D structure prediction
Modeling for 3D structure prediction What is a predicted structure? A structure that is constructed using as the sole source of information data obtained from computer based data-mining. However, mixing
More informationQuinazolinone Derivatives as Growth Hormone Secretagogue Receptor Inhibitors: 3D-QSAR study
International Journal of ChemTech Research CODE (USA): IJCRGG, ISS: 0974-4290, ISS(Online):2455-9555 Vol.9, o.05 pp 896-903, 2016 Quinazolinone Derivatives as Growth Hormone Secretagogue Receptor Inhibitors:
More informationExamples of Protein Modeling. Protein Modeling. Primary Structure. Protein Structure Description. Protein Sequence Sources. Importing Sequences to MOE
Examples of Protein Modeling Protein Modeling Visualization Examination of an experimental structure to gain insight about a research question Dynamics To examine the dynamics of protein structures To
More informationDOCKING TUTORIAL. A. The docking Workflow
2 nd Strasbourg Summer School on Chemoinformatics VVF Obernai, France, 20-24 June 2010 E. Kellenberger DOCKING TUTORIAL A. The docking Workflow 1. Ligand preparation It consists in the standardization
More informationStructure and evolution of the spliceosomal peptidyl-prolyl cistrans isomerase Cwc27
Acta Cryst. (2014). D70, doi:10.1107/s1399004714021695 Supporting information Volume 70 (2014) Supporting information for article: Structure and evolution of the spliceosomal peptidyl-prolyl cistrans isomerase
More informationDifferent conformations of the drugs within the virtual library of FDA approved drugs will be generated.
Chapter 3 Molecular Modeling 3.1. Introduction In this study pharmacophore models will be created to screen a virtual library of FDA approved drugs for compounds that may inhibit MA-A and MA-B. The virtual
More informationViewing and Analyzing Proteins, Ligands and their Complexes 2
2 Viewing and Analyzing Proteins, Ligands and their Complexes 2 Overview Viewing the accessible surface Analyzing the properties of proteins containing thousands of atoms is best accomplished by representing
More informationSecondary Structure. Bioch/BIMS 503 Lecture 2. Structure and Function of Proteins. Further Reading. Φ, Ψ angles alone determine protein structure
Bioch/BIMS 503 Lecture 2 Structure and Function of Proteins August 28, 2008 Robert Nakamoto rkn3c@virginia.edu 2-0279 Secondary Structure Φ Ψ angles determine protein structure Φ Ψ angles are restricted
More informationElectronic Supplementary Information Effective lead optimization targeted for displacing bridging water molecule
Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is the Owner Societies 2018 Electronic Supplementary Information Effective lead optimization targeted for displacing
More informationCan protein model accuracy be. identified? NO! CBS, BioCentrum, Morten Nielsen, DTU
Can protein model accuracy be identified? Morten Nielsen, CBS, BioCentrum, DTU NO! Identification of Protein-model accuracy Why is it important? What is accuracy RMSD, fraction correct, Protein model correctness/quality
More informationFull Papers. 1 Introduction. Min Yang a, Lu Zhou a *, Zhili Zuo b *, Ricardo Mancera c, Hang Song a, Xiangyang Tang d, Xiang Ma a
Docking Study and Three-Dimensional Quantitative Structure-Activity Relationship (3D-QSAR) Analyses of Min Yang a, Lu Zhou a *, Zhili Zuo b *, Ricardo Mancera c, Hang Song a, Xiangyang Tang d, Xiang Ma
More informationRanjit P. Bahadur Assistant Professor Department of Biotechnology Indian Institute of Technology Kharagpur, India. 1 st November, 2013
Hydration of protein-rna recognition sites Ranjit P. Bahadur Assistant Professor Department of Biotechnology Indian Institute of Technology Kharagpur, India 1 st November, 2013 Central Dogma of life DNA
More informationChemical properties that affect binding of enzyme-inhibiting drugs to enzymes
Introduction Chemical properties that affect binding of enzyme-inhibiting drugs to enzymes The production of new drugs requires time for development and testing, and can result in large prohibitive costs
More informationSensitive NMR Approach for Determining the Binding Mode of Tightly Binding Ligand Molecules to Protein Targets
Supporting information Sensitive NMR Approach for Determining the Binding Mode of Tightly Binding Ligand Molecules to Protein Targets Wan-Na Chen, Christoph Nitsche, Kala Bharath Pilla, Bim Graham, Thomas
More information3D QSAR studies of Substituted Benzamides as Nonacidic Antiinflammatory Agents by knn MFA Approach
INTERNATIONAL JOURNAL OF ADVANCES IN PARMACY, BIOLOGY AND CEMISTRY Research Article 3D QSAR studies of Substituted Benzamides as Nonacidic Antiinflammatory Agents by knn MFA Approach Anupama A. Parate*
More informationCharacterization of Binding Mode for Human Coagulation Factor XI (FXI) Inhibitors
1212 Bull. Korean Chem. Soc. 2013, Vol. 34, No. 4 Jae Eun Cho et al. http://dx.doi.org/10.5012/bkcs.2013.34.4.1212 Characterization of Binding Mode for Human Coagulation Factor XI (FXI) Inhibitors Jae
More informationSUPPLEMENTARY INFORMATION
SUPPLEMENTARY INFORMATION doi:10.1038/nature11524 Supplementary discussion Functional analysis of the sugar porter family (SP) signature motifs. As seen in Fig. 5c, single point mutation of the conserved
More informationNonlinear QSAR and 3D QSAR
onlinear QSAR and 3D QSAR Hugo Kubinyi Germany E-Mail kubinyi@t-online.de HomePage www.kubinyi.de onlinear Lipophilicity-Activity Relationships drug receptor Possible Reasons for onlinear Lipophilicity-Activity
More informationChem. 27 Section 1 Conformational Analysis Week of Feb. 6, TF: Walter E. Kowtoniuk Mallinckrodt 303 Liu Laboratory
Chem. 27 Section 1 Conformational Analysis TF: Walter E. Kowtoniuk wekowton@fas.harvard.edu Mallinckrodt 303 Liu Laboratory ffice hours are: Monday and Wednesday 3:00-4:00pm in Mallinckrodt 303 Course
More informationBiological Macromolecules
Introduction for Chem 493 Chemistry of Biological Macromolecules Dr. L. Luyt January 2008 Dr. L. Luyt Chem 493-2008 1 Biological macromolecules are the molecules of life allow for organization serve a
More information3D-QSAR study on heterocyclic topoisomerase II inhibitors using CoMSIAy
SAR and QSAR in Environmental Research Vol. 17, No. 2, April 2006, 121 132 3D-QSAR study on heterocyclic topoisomerase II inhibitors using CoMSIAy B. TEKINER-GULBAS, O. TEMIZ-ARPACI, I. YILDIZ*, E. AKI-SENER
More informationPlan. Day 2: Exercise on MHC molecules.
Plan Day 1: What is Chemoinformatics and Drug Design? Methods and Algorithms used in Chemoinformatics including SVM. Cross validation and sequence encoding Example and exercise with herg potassium channel:
More informationVolume 12(2)
Open access www.bioinformation.net Volume 12(2) Hypothesis Insights from molecular modeling, docking and simulation of imidazole nucleus containing chalcones with EGFR kinase domain for improved binding
More informationRetrieving hits through in silico screening and expert assessment M. N. Drwal a,b and R. Griffith a
Retrieving hits through in silico screening and expert assessment M.. Drwal a,b and R. Griffith a a: School of Medical Sciences/Pharmacology, USW, Sydney, Australia b: Charité Berlin, Germany Abstract:
More informationHOMOLOGY MODELING. The sequence alignment and template structure are then used to produce a structural model of the target.
HOMOLOGY MODELING Homology modeling, also known as comparative modeling of protein refers to constructing an atomic-resolution model of the "target" protein from its amino acid sequence and an experimental
More informationA 3D-QSAR Study of Celebrex-based PDK1 Inhibitors Using CoMFA Method
Journal of the Chinese Chemical Society, 2009, 56, 59-64 59 A 3D-QSAR Study of Celebrex-based PDK1 Inhibitors Using CoMFA Method Wen-Hung Wang a ( ),N.R.Jena a ( ), Yi-Ching Wang b ( ) and Ying-Chieh Sun
More informationIntroduction to Computational Modelling and Functional Analysis of Proteins
Introduction to Computational Modelling and Functional Analysis of Proteins AG Prof. Dr. Monika Fritz Pure and Applied Biomineralisation Institute for Biophysics AG Prof. Dr. Manfred Radmacher Institute
More information3D-QSAR and Molecular Docking Studies on Derivatives of MK-0457, GSK and SNS-314 as Inhibitors against Aurora B Kinase
Int. J. Mol. Sci. 2010, 11, 4326-4347; doi:10.3390/ijms11114326 OPEN ACCESS Article International Journal of Molecular Sciences ISSN 1422-0067 http://www.mdpi.com/journal/ijms 3D-QSAR and Molecular Docking
More informationProtein Structure Bioinformatics Introduction
1 Swiss Institute of Bioinformatics Protein Structure Bioinformatics Introduction Basel, 27. September 2004 Torsten Schwede Biozentrum - Universität Basel Swiss Institute of Bioinformatics Klingelbergstr
More informationComputational analysis of the activity of pongachalcone I against highly resistant bacteria Pseudomonas putida
Computational analysis of the activity of pongachalcone I against highly resistant bacteria Pseudomonas putida Satya B. Paul 1, Sudip Choudhury 2,* 1 Department of Chemistry, Assam University, Silchar,
More informationDATE A DAtabase of TIM Barrel Enzymes
DATE A DAtabase of TIM Barrel Enzymes 2 2.1 Introduction.. 2.2 Objective and salient features of the database 2.2.1 Choice of the dataset.. 2.3 Statistical information on the database.. 2.4 Features....
More informationOther Cells. Hormones. Viruses. Toxins. Cell. Bacteria
Other Cells Hormones Viruses Toxins Cell Bacteria ΔH < 0 reaction is exothermic, tells us nothing about the spontaneity of the reaction Δ H > 0 reaction is endothermic, tells us nothing about the spontaneity
More informationTable 1. Crystallographic data collection, phasing and refinement statistics. Native Hg soaked Mn soaked 1 Mn soaked 2
Table 1. Crystallographic data collection, phasing and refinement statistics Native Hg soaked Mn soaked 1 Mn soaked 2 Data collection Space group P2 1 2 1 2 1 P2 1 2 1 2 1 P2 1 2 1 2 1 P2 1 2 1 2 1 Cell
More informationProtein-Ligand Docking Evaluations
Introduction Protein-Ligand Docking Evaluations Protein-ligand docking: Given a protein and a ligand, determine the pose(s) and conformation(s) minimizing the total energy of the protein-ligand complex
More informationTutorial: Structural Analysis of a Protein-Protein Complex
Molecular Modeling Section (MMS) Department of Pharmaceutical and Pharmacological Sciences University of Padova Via Marzolo 5-35131 Padova (IT) @contact: stefano.moro@unipd.it Tutorial: Structural Analysis
More information7.91 Amy Keating. Solving structures using X-ray crystallography & NMR spectroscopy
7.91 Amy Keating Solving structures using X-ray crystallography & NMR spectroscopy How are X-ray crystal structures determined? 1. Grow crystals - structure determination by X-ray crystallography relies
More informationDescription of Molecules with Molecular Interaction Fields (MIF)
Description of Molecules with Molecular Interaction Fields (MIF) Introduction to Ligand-Based Drug Design Chimica Farmaceutica 2 Reduction of Dimensionality into Few New Highly Informative Entities -----
More informationVisualization of Macromolecular Structures
Visualization of Macromolecular Structures Present by: Qihang Li orig. author: O Donoghue, et al. Structural biology is rapidly accumulating a wealth of detailed information. Over 60,000 high-resolution
More informationICM-Chemist-Pro How-To Guide. Version 3.6-1h Last Updated 12/29/2009
ICM-Chemist-Pro How-To Guide Version 3.6-1h Last Updated 12/29/2009 ICM-Chemist-Pro ICM 3D LIGAND EDITOR: SETUP 1. Read in a ligand molecule or PDB file. How to setup the ligand in the ICM 3D Ligand Editor.
More informationUser Guide for LeDock
User Guide for LeDock Hongtao Zhao, PhD Email: htzhao@lephar.com Website: www.lephar.com Copyright 2017 Hongtao Zhao. All rights reserved. Introduction LeDock is flexible small-molecule docking software,
More informationIn silico pharmacology for drug discovery
In silico pharmacology for drug discovery In silico drug design In silico methods can contribute to drug targets identification through application of bionformatics tools. Currently, the application of
More informationHomology Modeling. Roberto Lins EPFL - summer semester 2005
Homology Modeling Roberto Lins EPFL - summer semester 2005 Disclaimer: course material is mainly taken from: P.E. Bourne & H Weissig, Structural Bioinformatics; C.A. Orengo, D.T. Jones & J.M. Thornton,
More informationMedicinal Chemistry/ CHEM 458/658 Chapter 4- Computer-Aided Drug Design
Medicinal Chemistry/ CHEM 458/658 Chapter 4- Computer-Aided Drug Design Bela Torok Department of Chemistry University of Massachusetts Boston Boston, MA 1 Computer Aided Drug Design - Introduction Development
More informationmolecules ISSN by MDPI
Molecules 2000, 5, 945-955 molecules ISSN 1420-3049 2000 by MDPI http://www.mdpi.org Three-Dimensional Quantitative Structural Activity Relationship (3D-QSAR) Studies of Some 1,5-Diarylpyrazoles: Analogue
More informationSpacer conformation in biologically active molecules*
Pure Appl. Chem., Vol. 76, No. 5, pp. 959 964, 2004. 2004 IUPAC Spacer conformation in biologically active molecules* J. Karolak-Wojciechowska and A. Fruziński Institute of General and Ecological Chemistry,
More information3D QSAR and Pharmacophore Modelling of Selected Benzimidazole Derivatives as Factor IXa Inhibitors
Research Paper 3D QSAR and Pharmacophore Modelling of Selected Benzimidazole Derivatives as Factor IXa Inhibitors S. S. KUMBHAR*, P. B. CHOUDHARI AD M. S. BHATIA Drug Design and Development Group, Department
More informationInternational Journal of Research and Development in Pharmacy and Life Sciences. Review Article
International Journal of Research and Development in Pharmacy and Life Sciences Available online at http//www.ijrdpl.com October - November, 2012, Vol. 1, No.4, pp 167-175 ISSN: 2278-0238 Review Article
More informationCHAPTER 3. Vibrational Characteristics of PTP-1B Inhibitors
CHAPTER 3 Vibrational Characteristics of PTP-1B Inhibitors 3.1 Preface Theoretical Frequency calculations were performed on the molecules chosen in this study. Initially all the geometries were optimized
More informationPose and affinity prediction by ICM in D3R GC3. Max Totrov Molsoft
Pose and affinity prediction by ICM in D3R GC3 Max Totrov Molsoft Pose prediction method: ICM-dock ICM-dock: - pre-sampling of ligand conformers - multiple trajectory Monte-Carlo with gradient minimization
More informationVirtual Screening: How Are We Doing?
Virtual Screening: How Are We Doing? Mark E. Snow, James Dunbar, Lakshmi Narasimhan, Jack A. Bikker, Dan Ortwine, Christopher Whitehead, Yiannis Kaznessis, Dave Moreland, Christine Humblet Pfizer Global
More informationSUPPLEMENTARY INFORMATION
Supplementary Results DNA binding property of the SRA domain was examined by an electrophoresis mobility shift assay (EMSA) using synthesized 12-bp oligonucleotide duplexes containing unmodified, hemi-methylated,
More informationBioengineering & Bioinformatics Summer Institute, Dept. Computational Biology, University of Pittsburgh, PGH, PA
Pharmacophore Model Development for the Identification of Novel Acetylcholinesterase Inhibitors Edwin Kamau Dept Chem & Biochem Kennesa State Uni ersit Kennesa GA 30144 Dept. Chem. & Biochem. Kennesaw
More informationMedicinal Chemistry/ CHEM 458/658 Chapter 3- SAR and QSAR
Medicinal Chemistry/ CHEM 458/658 Chapter 3- SAR and QSAR Bela Torok Department of Chemistry University of Massachusetts Boston Boston, MA 1 Introduction Structure-Activity Relationship (SAR) - similar
More informationDr. Sander B. Nabuurs. Computational Drug Discovery group Center for Molecular and Biomolecular Informatics Radboud University Medical Centre
Dr. Sander B. Nabuurs Computational Drug Discovery group Center for Molecular and Biomolecular Informatics Radboud University Medical Centre The road to new drugs. How to find new hits? High Throughput
More informationComputational chemical biology to address non-traditional drug targets. John Karanicolas
Computational chemical biology to address non-traditional drug targets John Karanicolas Our computational toolbox Structure-based approaches Ligand-based approaches Detailed MD simulations 2D fingerprints
More informationFigure 1. Molecules geometries of 5021 and Each neutral group in CHARMM topology was grouped in dash circle.
Project I Chemistry 8021, Spring 2005/2/23 This document was turned in by a student as a homework paper. 1. Methods First, the cartesian coordinates of 5021 and 8021 molecules (Fig. 1) are generated, in
More informationWeek 10: Homology Modelling (II) - HHpred
Week 10: Homology Modelling (II) - HHpred Course: Tools for Structural Biology Fabian Glaser BKU - Technion 1 2 Identify and align related structures by sequence methods is not an easy task All comparative
More informationNMR study of complexes between low molecular mass inhibitors and the West Nile virus NS2B-NS3 protease
University of Wollongong Research Online Faculty of Science - Papers (Archive) Faculty of Science, Medicine and Health 2009 NMR study of complexes between low molecular mass inhibitors and the West Nile
More informationDesign and Molecular Docking Studies of Some 1,3,4-Oxadiazole Derivatives
Research Article Design and Molecular Docking Studies of Some 1,3,4-Oxadiazole Derivatives Dinesh Rishipathak *1, Prabhakar Shirodkar 2 1 Department of Pharmaceutical Chemistry, MET s Institute of Pharmacy,
More informationInt. J. Pharm. Sci. Rev. Res., 30(1), January February 2015; Article No. 06, Pages: 28-34
Research Article Application of 3D QSAR CoMFA/CoMSIA and In Silico Docking Studies on Potent Inhibitors of Interleukin-2 Inducible T-cell Kinase (ITK) Shravan Kumar Gunda*, Sri Swathi Mutya, Sharada Durgam,
More informationFrancisco Melo, Damien Devos, Eric Depiereux and Ernest Feytmans
From: ISMB-97 Proceedings. Copyright 1997, AAAI (www.aaai.org). All rights reserved. ANOLEA: A www Server to Assess Protein Structures Francisco Melo, Damien Devos, Eric Depiereux and Ernest Feytmans Facultés
More informationSolutions and Non-Covalent Binding Forces
Chapter 3 Solutions and Non-Covalent Binding Forces 3.1 Solvent and solution properties Molecules stick together using the following forces: dipole-dipole, dipole-induced dipole, hydrogen bond, van der
More informationSupporting Information
Supporting Information Superagonist, Full Agonist, Partial Agonist and Antagonist Actions of Arylguanidines at 5-Hydroxytryptamine-3 (5-HT 3 ) Subunit A Receptors Katie Alix, Shailesh Khatri, Philip D.
More informationNitrogenase MoFe protein from Clostridium pasteurianum at 1.08 Å resolution: comparison with the Azotobacter vinelandii MoFe protein
Acta Cryst. (2015). D71, 274-282, doi:10.1107/s1399004714025243 Supporting information Volume 71 (2015) Supporting information for article: Nitrogenase MoFe protein from Clostridium pasteurianum at 1.08
More informationDocking. GBCB 5874: Problem Solving in GBCB
Docking Benzamidine Docking to Trypsin Relationship to Drug Design Ligand-based design QSAR Pharmacophore modeling Can be done without 3-D structure of protein Receptor/Structure-based design Molecular
More informationJournal of Molecular Graphics and Modelling
Journal of Molecular Graphics and Modelling 38 (2012) 194 210 Contents lists available at SciVerse ScienceDirect Journal of Molecular Graphics and Modelling j ourna l ho me page: www.elsevier.com/locate/jmgm
More informationNature Structural & Molecular Biology: doi: /nsmb Supplementary Figure 1
Supplementary Figure 1 Crystallization. a, Crystallization constructs of the ET B receptor are shown, with all of the modifications to the human wild-type the ET B receptor indicated. Residues interacting
More informationBIOINF Drug Design 2. Jens Krüger and Philipp Thiel Summer Lecture 5: 3D Structure Comparison Part 1: Rigid Superposition, Pharmacophores
BIOINF 472 Drug Design 2 Jens Krüger and Philipp Thiel Summer 2014 Lecture 5: D Structure Comparison Part 1: Rigid Superposition, Pharmacophores Overview Comparison of D structures Rigid superposition
More informationChemical properties that affect binding of enzyme-inhibiting drugs to enzymes
Chemical properties that affect binding of enzyme-inhibiting drugs to enzymes Introduction The production of new drugs requires time for development and testing, and can result in large prohibitive costs
More informationMolecular Docking and 3D-QSAR Based Design of Novel Imidazopyridinone Derivatives as Pseudomonas Aeruginosa Thymidylate Kinase Inhibitors
http://www.e-journals.in Chemical Science Transactions DI:10.7598/cst2014.704 2014, 3(2), 498-509 RESEARC ARTICLE Molecular Docking and 3D-QSAR Based Design of ovel Imidazopyridinone Derivatives as Pseudomonas
More informationElectronic Supplementary Information. A biologically relevant fluorescent probe to assess the binding of ceramide to the CERT transfer protein
This journal is The Royal Society of Chemistry 20 Electronic Supplementary Information A biologically relevant fluorescent probe to assess the binding of ceramide to the CERT transfer protein Stéphanie
More informationUsing Higher Calculus to Study Biologically Important Molecules Julie C. Mitchell
Using Higher Calculus to Study Biologically Important Molecules Julie C. Mitchell Mathematics and Biochemistry University of Wisconsin - Madison 0 There Are Many Kinds Of Proteins The word protein comes
More informationβ1 Structure Prediction and Validation
13 Chapter 2 β1 Structure Prediction and Validation 2.1 Overview Over several years, GPCR prediction methods in the Goddard lab have evolved to keep pace with the changing field of GPCR structure. Despite
More informationSupplementary Materials for
www.sciencesignaling.org/cgi/content/full/5/243/ra68/dc1 Supplementary Materials for Superbinder SH2 Domains Act as Antagonists of Cell Signaling Tomonori Kaneko, Haiming Huang, Xuan Cao, Xing Li, Chengjun
More informationJournal of Pharmacology and Experimental Therapy-JPET#172536
A NEW NON-PEPTIDIC INHIBITOR OF THE 14-3-3 DOCKING SITE INDUCES APOPTOTIC CELL DEATH IN CHRONIC MYELOID LEUKEMIA SENSITIVE OR RESISTANT TO IMATINIB Manuela Mancini, Valentina Corradi, Sara Petta, Enza
More informationSUPPLEMENTARY INFORMATION
doi:10.1038/nature11085 Supplementary Tables: Supplementary Table 1. Summary of crystallographic and structure refinement data Structure BRIL-NOP receptor Data collection Number of crystals 23 Space group
More informationSupporting Information
Supporting Information Micelle-Triggered b-hairpin to a-helix Transition in a 14-Residue Peptide from a Choline-Binding Repeat of the Pneumococcal Autolysin LytA HØctor Zamora-Carreras, [a] Beatriz Maestro,
More informationBSc and MSc Degree Examinations
Examination Candidate Number: Desk Number: BSc and MSc Degree Examinations 2018-9 Department : BIOLOGY Title of Exam: Molecular Biology and Biochemistry Part I Time Allowed: 1 hour and 30 minutes Marking
More information