Uptake of Adenosine 5'-Monophosphate by Escherichia coli
|
|
- Harry Simon
- 6 years ago
- Views:
Transcription
1 JOURNAL OF BACTERIOLoGY, Feb. 1975, p Copyright 1975 American Society for Microbiology Vol. 11, No. Printed in U.S.A. Uptake of Adenosine 5'-Monophosphate by Escherichia coli EZRA YAGIL* AND IFOR R. BEACHAM Department of Biochemistry, George S. Wise Center for Life Sciences, Tel-Aviv University, Tel-Aviv, Israel, and Department of Botany and Microbiology, University College of Wales, Aberystwyth SY3 3DA, United Kingdom Received for publication 16 September 1974 Adenosine 5'-monophosphate is dephosphorylated before its uptake by cells of Escherichia coli. This is demonstrated by using a radioactive double-labeled culture, and with a 5'-nucleotidase-deficient mutant strain. The adenosine formed is further phosphorolyzed to adenine as a prerequisite for its uptake and incorporation. The cellular localization of the enzymes involved in the catabolism of adenosine 5'-monophosphate is discussed. In recent years several active transport mechanisms for phosphorylated metabolites have been elucidated, for example L-ai-glycerol phosphate (1) and several hexose phosphates (5, 8, 9, 5). These phosphorylated compounds are taken up by the bacterial cell in their intact form; their specific transport systems were detected in mutant strains impaired in the transport mechanism for the non-phosphorylated forms of the metabolites (for review see reference 18). Adenosine 5'-monephosphate (AMP) can readily serve as a carbon source for cells of Escherichia coli (7) and the adenine moiety is incorporated into the nucleic acids of the cell (1). The enzyme 5'-nucleotidase (EC , known also as uridine diphosphate sugar hydrolase) is a surface enzyme located between the two membranes of the cell envelope (11) and it cleaves AMP to adenosine and inorganic phosphate. It is therefore not known whether AMP can enter the cell in its intact form or whether it must be dephosphorylated before its uptake, though the latter possibility is strongly suggested by the finding that mutants deficient in 5'-nucleotidase are unable to use AMP as a carbon source (). In this communication we provide direct evidence that dephosphorylation by 5'-nucleotidase is obligatory for uptake of the adenosine moiety. Furthermore, we confirm previous reports on Salmonella cells (15) and on membrane vesicles of E. coli (1) that the adenosine formed as a result of the dephosphorylation is further cleaved to adenine before it is incorporated by the cell. MATERIALS AND METHODS Bacterial strains. Table 1 lists the bacterial strains used, which were all E. coli K-1 strains. Growth conditions. The cells were grown at 37 C in phosphate-buffered minimal M9 medium (). Glucose concentration was.%, the concentration of required amino acids was gg/ml, and of thiamine, Ag/ml. Uptake experiments. Radioactive-labeled compounds were added to exponentially growing cell cultures. In the double-label experiments portions of.5 ml were removed at intervals and filtered through nitrocellulose filters (.45 Am pore size). The filters were immediately washed at room temperature with ml of M9 buffer (M9 medium without glucose) and dried under a lamp. The filtrate was counted by placing 5 uliters onto another filter, which was then dried. The filters were counted in a scintillation spectrometer using toluene scintillation solution. In the experiments labeled with a single radioactive compound, two kinds of samples were taken at intervals: for the measurement of label incorporated into the nucleic acids,.1 ml was added to 1. ml of 5% cold trichloroacetic acid, and after at least 3 min the trichloroacetic acid was filtered and the filter was washed with ml of cold water, dried, and counted as described. To measure incorporation by whole cells,.1 ml of the culture was put directly onto a filter, washed with ml of M9 buffer, dried, and TABLE 1. Characteristics of Escherichia coli strains Strain Sex Genotype Refer- AB F- thr ara leu proa lac tsx gal his stra xyl mtl arg thi upp 5A-1 F- thr ara leu proa lac tsx gal his stra xyl mtl arg thi uppa ushe 4K F- serb arga thr leu thi stra 6 4K-6 F- pup udp tpp dra upp thr 6 l leu thi stra a upp, UMP pyrophosphorylase (uracil phosphoribosyl transferase). b ush, Uridine diphosphate sugar hydrolase (5'- nucleotidase). 41
2 4 YAGIL AND BEACHAM J. BACTERIOL. counted. Radiochemicals. [3PJAMP, ammonium salt, [- 3H]AMP, ammonium salt, and [8-14C]adenosine sulfate were purchased from the Radiochemical Centre, Amersham, Bucks, U.K. RESULTS To determine whether AMP is taken up in its intact form or whether it must be dephosphorylated before its uptake, we added to a growing culture of cells a mixture of [3P]AMP and [3H ]AMP labeled at position of the adenine moiety. The disappearance of the label from the medium (Fig. 1A) and its uptake by the cells (Fig. 1B) were followed. Only the tritium label was removed from the medium while being incorpoiated into the cells; the 3P label remained entirely in the medium, and no incorporation was detected. This shows that AMP is dephosphorylated before its uptake. Uptake of inorganic 3P was not observed since the growth medium contained a large excess of unlabeled inorganic phosphate. We have recently described the isolation and properties of 5'-nucleotidase-deficient mutants (). Figure shows the ability to take up and incorporate labeled [3H ]AMP by such a mutant (5A-1) as compared to the parental wild-type strain (AB1157-1). In Fig. A uptake is shown by whole cells, which includes both the cellular pool of the labeled nucleotide and incorporation into nucleic acids. Figure B shows the incorporation into the nucleic acid only (acid-precipitable material). The difference between the values in Fig. A and B is considered as unincorporated soluble label taken up into the cellular 4 [ _ (A) (8) 3 p3 Ẹ'D. _ o a (A) WHOLE CELLS AB (+) 5A-1 (ush) r (B)NUCLEIC ACIDS -. % (C) PCooL I FIG.. Uptake and incorporation of label by a 5'-nucleotidase-deficient mutant (Ush, strain 5A-1) and its Ush+ parental strain (AB1157-1) supplemented with [3H1AMP. Logarithmically growing cultures (-.7 x 18 cells/ml) were labeled with [3H]AMP (.5 MM; 1 mci/gmol) and uptake by whole cells (A) and incorporation into nucleic acids (B) were measured as described in Materials and Methods. Part (C) shows the difference between (A) and (B). E - A A FIG. 1. Uptake of label by a culture of strain AB supplemented with a mixture of [3PJAMP (.33 um;.6 qci/umol) and [3H1AMP (.33 um;.63 mci/mgmol). The labeled compounds were added to a growing culture (-4 x 1' cells/ml) and at intervals portions were filtered through a membrane (see Materials and Methods). (A) label remaining in filtrate; (B) label taken up by the cells. pool (Fig. C). It is clear that the uptake of AMP is abolished by the 5'-nucleotidase-deficient mutant strain, which confirms that AMP must be cleaved before its uptake, and that 5'-nucleotidase is specifically involved. The question arises whether the adenosine formed as a result of AMP dephosphorylation can now be taken up in its intact form or must be further cleaved to adenine. Evidence for the latter possibility was already given for cells of Salmonella (15) and membrane vesicles of E. coli (1). To investigate this question we used a mutant strain lacking purine nucleoside phosphorylase activity (Pup-, EC.4..1) which was isolated by the method described by Ahmad
3 VOL. 11, 1975 UPTAKE OF AMP BY E. COLI 43 and Pritchard (1). This enzyme which phosphorolyzes adenosine to adenine and ribose- 1-phosphate is inducible by adenosine (19). Figure 3 shows the uptake and incorporation of labeled adenosine and of adenine in an induced culture of Pup- cells as compared to the parental Pup+ strain. As previously, part A shows uptake and incorporation by whole cells, part B shows incorporation only, and part C, which is the difference between A and B, indicates the pool of free label within the cells. Only the uptake of adenosine, and not that of adenine, is 6 5 a r4 E c (B) NUClLEIC ACIDS (C) PC)OL /g FIG. 3. Uptake and incorporation of label by a purine nucleoside phosphorylase-deficient mutant (Pup-, strain 4K-6) and its Pup+ parental strain (4K) in cultures labeled with [14C]adenosine or ["4C]adenine. The cultures were grown logarithmically for one generation in the presence of 1 mm adenosine and then centrifuged, washed, and resuspended in fresh M9 minimal medium to a cell density of 1. 7 x 18 cells/m 1. [14C ]adenosine or [14C ]adenine (11.3 um; 5.88 MCi/mmol) were added. Uptake by whole cells (A) and incorporation into nucleic acids (B) were measured as described in Materials and Methods. Part (C) shows the difference between (A) and (B). I/ significantly reduced by the Pup- mutation. This clearly demonstrates that purine nucleoside phosphorylase is essential for substantial uptake and incorporation of adenosine, i.e., adenosine must be first cleaved to adenine. The residual incorporation and uptake to labeled adenosine observed in the Pup- strain could either be due to leakiness of the pup mutation or due to uptake of adenosine (, 1; see Discussion) and its conversion to nucleotides by the appropriate kinases. DISCUSSION The experiments reported by Lichtenstein, Barner, and Cohen (17) showed that cytidine 5'-monophosphate is dephosphorylated before its uptake by E. coli. We have shown that a purine nucleotide, AMP, is likewise dephosphorylated before uptake, and that 5'-nucleotidase is exclusively involved. For the efficient utilization of the adenosine formed as a result of the dephosphorylation, it must first be cleaved by purine nucleoside phosphorylase to adenine and ribose-1-phosphate. Hochstadt-Ozer (1) likewise showed that membrane vesicles of E. coli cannot take up adenosine unless it is first cleaved to adenine, and the latter is directly converted to AMP by a membrane-associated phosphoribosyl transferase. Furthermore, Hoffmeyer and Neuhard (15) have found that the purine requirement of purine auxotrophs of Salmonella typhimurium, which are also defective in purine nucleoside phosphorylase activity (Pup-), cannot be satisfied by adenosine or deoxyadenosine. These investigators have suggested that the metabolic inertness of adenosine in a Pup- mutant strain is due to the lack of adenosine kinase. The data of Fig. 3, which show that the Pup- mutation reduces the soluble pool when adenosine is provided (Fig. 3C), suggest that intact adenosine is not taken up by the cell. In contrast, several investigators have proposed the existence of an uptake mechanism of adenosine (and other nucleosides) (6, 16,, 1). According to the data discussed above, such an uptake mechanism is not a major reaction in the utilization of adenosine. Furthermore, its existence has not yet been directly proven, since in all reported investigations the nucleosides used were radioactively labeled in the base moiety only. The pathway by which AMP is utilized by E. coli is proposed in Fig. 4. The cellular localization of 5'-nucleotidase, purine nucleoside phosphorylase,. and adenine phosphoribosyl transferase is noteworthy and is pointed out in Fig. 4. All three enzymes are
4 44 YAGIL AND BEACHAM J. BACTERIOL. We thank Nava Silberstein for skillful technical assistance. 5 FIG. 4. Catabolism and uptake of AMP across the cell envelope. Symbols: (OM) outer membrane, (IM) inner membrane, (Ado) adenosine, (A) adenine, (PRPP) phosphoribosyl pyrophosphate, (Ush) UDPsugar hydrolase (5'-nucleotidase), (Pup) purine nucleoside phosphorylase, (Apt) adenine phosphoribosyl transferase. selectively released into the medium when the cells are osmotically shocked (3, 11, 14, ), which indicates a "surface" localization. In contrast, when the cells are converted into spherophasts by the action of lysozyme and ethylenediaminetetraacetic acid (a treatment which ruptures the outer membrane; reference 11), 5'-nucleotidase, but not purine nucleoside phosphorylase, is released into the medium (3, 4, 3). This indicates that 5'-nucleotidase is located unbound in the periplasmic space, whereas purine nucleoside phosphorylase, though being surface localized, is not periplasmic. A second line of evidence suggesting that purine nucleoside phosphorylase as well as adenine phosphoribosyl transferase are surface located is provided by the finding that both activities are retained in membrane vesicles formed from osmotically disrupted spheroplasts (1, 13). Taketo and Kuno (3), on the other hand, were unable to detect specific binding of purine phosphorylase to membranes. Thus, although in Fig. 4 these two enzymes are shown in association with the inner membrane, the nature of their surface localization is not yet clear. ACKNOWLEDGMENTS Part of this work was supported by the Science Research Council (United Kingdom). E. Y. was supported by a Fellowship of the European Molecular Biology Organisation. LITERATURE CITED 1. Ahmad, S. I., and R. H. Pritchard A map of four genes specifying enzymes involved in catabolism of nucleosides and deoxynucleosides in Escherichia coli. Mol. Gen. Genet. 14: Beacham, I. R., R. Kahana, L. Levy, and E. Yagil Mutants of Escherichia coli K-1 "cryptic" or deficient in 5'-nucleotidase (uridine diphosphate-sugar hydrolase) and 3-nucleotidase (cyclic phosphodiesterase) activity. J. Bacteriol. 116: Beacham, I. R., E. Yagil, K. Beacham, and R. H. Pritchard On the localization of enzymes of deoxynucleoside catabolism in Escherichia coli. FEBS Lett. 16: Cerny, G., and M. Teuber Comparative polyacrylamide electrophoresis of periplasmic proteins released from gram-negative bacteria by polymyxin B. Arch. Mikrobiol. 8: Dietz, G. W., and L. A. Heppel Studies on the uptake of hexose phosphates. III. Mechanism of uptake of glucose-i-phosphate in Escherichia coli. J. Biol. Chem. 46: Doskocil, J Inducible nucleoside permease in Escherichia coli. Biochem. Biophys. Res. Commun. 56: Eggleston, L. V., and H. A. Krebs Permeability of Escherichia coli to ribose and ribose nucleotides. Biochem. J. 73: Fraenkel, D. G., F. Falcoz-Kelley, and B. L. Horecker The utilization of glucose-6-phosphate by glucokinaseless and wild type strains of Escherichia coli. Proc. Nat. Acad. Sci. U.S.A. 5: Hagihira, H., T. H. Wilson, and E. C. C. Lin Studies on the glucose-transport system in Escherichia coli with a-methylglucoside as substrate. Biochim. Biophys. Acta 78: Hayashi, S. I., J. P. Koch, and E. C. C. Lin Active transport of L-a-glycerophosphate in Escherichia coli. J. Biol. Chem. 39: Heppel, L. A The concept of periplasmic enzymes, p In L. I. Rothfield (ed.), Structure and function of biological membranes. Academic Press Inc., New York. 1. Hochstadt-Ozer, J The regulation of purine utilization in bacteria. IV. Role of membrane-localized and pericytoplasmic enzymes in the mechanism of purine nucleoside transport across isolated Escherichia coli membranes. J, Biol. Chem. 47: Hochstadt-Ozer, J., and E. R. Stadman The regulation of purine utilization in bacteria. II. Adenine phosphoriboyltransferase in isolated membrane preparations and its role in transport of adenine across the membrane. J. Biol. Chem. 46: Hochstadt-Ozer, J., and E. R. Stadman The regulation of purine utilization in bacteria. III. The involvement of purine phosphoribosyl transferases in the uptake of adenine and other nucleic acid precursors by intact resting cells. J. Biol. Chem. 46: Hoffmeyer, J., and J. Neuhard Metabolism of exogenous purine bases and nucleosides by Salmonella typhimurium. J. Bacteriol. 16: Komatsu, Y., and K. Tanaka A showdomycinresistant mutant of Escherichia coli K-1 with altered nucleoside transport character. Biochim. Biophys. Acta 88: Lichtenstein, J., H. D. Barner, and S. S. Cohen The metabolism of exogenously supplied nucleotides
5 VOL. 11, 1975 UPTAKE OF AMP BY E. COLI 45 by Escherichia coli. J. Biol. Chem. 35: Lin, E. C. C The genetics of bacterial transport systems. Annu. Rev. Genet. 4: Munch-Peterson, A On the catabolism of deoxyribonucleosides in cells and cell extracts of Escherichia coli. Eur. J. Biochem. 6: Petersen, R. N., J. Boniface, and A. L. Koch Energy requirements, interactions and distinctions in the mechanisms for transport of various nucleosides in Escherichia coli. Biochim. Biophys. Acta 135: Petersen, R. N., and A. L. Koch The relationship of adenosine and inosine transport in Escherichia coli. Biochim. Biophys. Acta 16: Pritchard, R. H., and K. G. Lark Induction of replication by thymine starvation at the chromosome origin in Escherichia coli. J. Mol. Biol. 9: Taketo, A., and S. Kuno Internal localization of nucleoside catabolic enzymes in Escherichia coli. J. Biochem. 7: Taylor, A. L., and C. D. Trotter Linkage map of Escherichia coli strain K-1. Bacteriol. Rev. 36: Winkler, H. H A hexose-phosphate transport system in Escherichia coli. Biochim. Biophys. Acta 117: Yagil, E., and A. Rosner Phosphorolysis of 5- fluoro-'-deoxyuridine in Escherichia coli and its inhibition by nucleosides. J. Bacteriol. 18:
Prerequisites Properties of allosteric enzymes. Basic mechanisms involving regulation of metabolic pathways.
Case 16 Allosteric Regulation of ATCase Focus concept An enzyme involved in nucleotide synthesis is subject to regulation by a variety of combinations of nucleotides. Prerequisites Properties of allosteric
More informationTHE THIRD GENERAL TRANSPORT SYSTEM BRANCHED-CHAIN AMINO ACIDS IN SALMONELLA T YPHIMURI UM KEIKO MATSUBARA, KUNIHARU OHNISHI, AND KAZUYOSHI KIRITANI
J. Gen. Appl. Microbiol., 34, 183-189 (1988) THE THIRD GENERAL TRANSPORT SYSTEM BRANCHED-CHAIN AMINO ACIDS IN SALMONELLA T YPHIMURI UM FOR KEIKO MATSUBARA, KUNIHARU OHNISHI, AND KAZUYOSHI KIRITANI Department
More informationMetabolism of Pyrimidines and Pyrimidine Nucleosides by Salmonella typhimurium
JOURNAL OF BAcTERIOLOGY, Apr. 1972, p. 219-228 Copyright 0 1972 American Society for Microbiology Vol. 110, No. 1 Printed in U.S.A. Metabolism of Pyrimidines and Pyrimidine Nucleosides by Salmonella typhimurium
More informationInteractions between Mutations Mecting Ribosome Synthesis in Escherichia coli
Journal of General Microbiology (1 989, 131, 945-949. Printed in Great Britain 945 Interactions between Mutations Mecting Ribosome Synthesis in Escherichia coli By PETER D. BUTLER, EMILIO CATTANEO AND
More informationUptake of AMP, ADP, and ATP in Escherichia coli W
Biosci. Biotechnol. Biochem., 75 (1), 7 12, 2011 Uptake of AMP, ADP, and ATP in Escherichia coli W Kimiko WATANABE, y Satsuki TOMIOKA, Kiyoko TANIMURA, Hisae OKU, and Koichiro ISOI School of Pharmacy and
More informationIntroduction. Gene expression is the combined process of :
1 To know and explain: Regulation of Bacterial Gene Expression Constitutive ( house keeping) vs. Controllable genes OPERON structure and its role in gene regulation Regulation of Eukaryotic Gene Expression
More informationA REGULATORY TRANSPORT MUTANT FOR BRANCHED-CHAIN AMINO ACIDS IN SALMONELLA TYPHIMURIUM KUNIHARU OHNISHI, KEIKO MURATA AND KAZUYOSHI KIRITANI
JAPAN. J. GENETICS Vol. 55, No. 5: 349-359 (1980) A REGULATORY TRANSPORT MUTANT FOR BRANCHED-CHAIN AMINO ACIDS IN SALMONELLA TYPHIMURIUM KUNIHARU OHNISHI, KEIKO MURATA AND KAZUYOSHI KIRITANI Department
More informationIntroduction to Molecular and Cell Biology
Introduction to Molecular and Cell Biology Molecular biology seeks to understand the physical and chemical basis of life. and helps us answer the following? What is the molecular basis of disease? What
More information2012 Univ Aguilera Lecture. Introduction to Molecular and Cell Biology
2012 Univ. 1301 Aguilera Lecture Introduction to Molecular and Cell Biology Molecular biology seeks to understand the physical and chemical basis of life. and helps us answer the following? What is the
More informationEFFECT OF ph AND AMMONIUM IONS ON THE PERMEABILITY
EFFECT OF ph AND AMMONIUM IONS ON THE PERMEABILITY OF BACILLUS PASTEURII W. R. WILEY AND J. L. STOKES Department of Bacteriology and Public Health, Washington State University, Pullman, Washington ABSTRACT
More informationTransport of Vitamin B12 in Escherichia coli: Energy
JOURNAL OF BACTERIOLOGY, Oct. 1976, p. 99-104 Copyright X) 1976 American Society for Microbiology Vol. 128, No. 1 Printed in U.S.A. Transport of Vitamin B12 in Escherichia coli: Energy Dependence CLIVE
More informationHelical Macrofiber Formation in Bacillus subtilis: Inhibition by Penicillin G
JOURNAL OF BACTERIOLOGY, June 1984, p. 1182-1187 0021-9193/84/061182-06$02.00/0 Copyright C 1984, American Society for Microbiology Vol. 158, No. 3 Helical Macrofiber Formation in Bacillus subtilis: Inhibition
More informationThe body has three primary lines of defense against changes in hydrogen ion concentration in the body fluids.
ph and Nucleic acids Hydrogen Ion (H+) concentration is precisely regulated. The H+ concentration in the extracellular fluid is maintained at a very low level, averaging 0.00000004Eq/L. normal variations
More informationElectron Microscopic Studies on Mode of Action of Polymyxin
JOURNAL OF BACrERIOLOGY, Jan. 1969, p. 448452 Vol. 97, No. I Copyright 1969 American Society for Microbiology Printed In U.S.A. Electron Microscopic Studies on Mode of Action of Polymyxin M. KOIKE, K.
More informationSpecificity of Uracil Uptake in Neurospora crassa
JoURAL OF BACTERIOLOGY, July 1979, p. 212-219 Vol. 139, o. 1 21-9193/79/7-212/8$2./ Specificity of Uracil Uptake in eurospora crassa PAULETTE DALKE* AD JAE M. MAGILL Department ofbiochemistry and Biophysics,
More informationRegulation of Methionyl-Transfer Ribonucleic
JOURNAL OF BACTERIOLOGY, June 1973, p. 1007-1013 Copyright i 1973 American Society for Microbiology Vol. 114, No. 3 Printed in U.S.A. Regulation of Methionyl-Transfer Ribonucleic Acid Synthetase Formation
More informationCh. 2 BASIC CHEMISTRY. Copyright 2010 Pearson Education, Inc.
Ch. 2 BASIC CHEMISTRY Matter and Composition of Matter Definition: Anything that has mass and occupies space Matter is made up of elements An element cannot be broken down by ordinary chemical means Atoms
More informationTranscarbamylase in Salmonella typhimurium
JOURNAL oi BACTERIOLOGY, Apr. 1972, p. 66-70 Copyright i 1972 American Society for Microbiology Vol. 110, No. 1 Printed in U.S.A. Structural Genes for Ornithine Transcarbamylase in Salmonella typhimurium
More informationA pentose bisphosphate pathway for nucleoside degradation in Archaea. Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto , Japan.
SUPPLEMENTARY INFORMATION A pentose bisphosphate pathway for nucleoside degradation in Archaea Riku Aono 1,, Takaaki Sato 1,, Tadayuki Imanaka, and Haruyuki Atomi 1, * 7 8 9 10 11 1 Department of Synthetic
More informationImportance of Glutathione for Growth and Survival of Escherichia coli Cells: Detoxification of Methylglyoxal and Maintenance of Intracellular K
JOURNAL OF BACTERIOLOGY, Aug. 1998, p. 4314 4318 Vol. 180, No. 16 0021-9193/98/$04.00 0 Copyright 1998, American Society for Microbiology. All Rights Reserved. Importance of Glutathione for Growth and
More informationTopic 4 - #14 The Lactose Operon
Topic 4 - #14 The Lactose Operon The Lactose Operon The lactose operon is an operon which is responsible for the transport and metabolism of the sugar lactose in E. coli. - Lactose is one of many organic
More informationBio 119 Solute Transport 7/11/2004 SOLUTE TRANSPORT. READING: BOM-10 Sec. 4.7 Membrane Transport Systems p. 71
SOLUTE TRANSPORT READG: BOM10 Sec. 4.7 Membrane Transport Systems p. 71 DISCUSSION QUESTIONS BOM10: Chapter 4; #6, #8 1. What are the 4 essential features of carrier mediated transport? 2. What does it
More informationThe Chemical Level of Organization
PowerPoint Lecture Slides prepared by Meg Flemming Austin Community College C H A P T E R 2 The Chemical Level of Organization Chapter 2 Learning Outcomes 2-1 2-2 2-3 2-4 Describe an atom and how atomic
More informationNucleoside Salvage Pathway for NAD Biosynthesis in
JOURNAL OF BACTERIOLOGY, Dec. 1982, p. 1111-1116 0021-9193/82/121111-06S02.000/ Copyright C 1982, American Society for Microbiology Vol. 152, No. 3 Nucleoside Salvage Pathway for Biosynthesis in Salmonella
More informationThis is an example of cellular respiration, which can be used to make beer and wine using different metabolic pathways For these reasons we call this
Chapter 6 Carvings from ancient Egypt show barley being crushed and mixed with water (left) and then put into closed vessels (centre) where airless conditions are suitable for the production of alcohol
More informationChem Lecture 10 Lipid, Amino Acid, and Nucleotide Metabolism Part III: Nucleotide Metabolism
Chem 352 - Lecture 10 Lipid, Amino Acid, and Nucleotide Metabolism Part III: Nucleotide Metabolism Lipid Metabolism Chem 352, Lecture 10, Part I: Lipid Metabolism 2 Lipid Metabolism Question: Draw a general
More informationNUTRITION AND METABOLISM OF MARINE BACTERIA'
NUTRITION AND METABOLISM OF MARINE BACTERIA' XII. ION ACTIVATION OF ADENOSINE TRIPHOSPHATASE IN MEMBRANES OF MARINE BACTERIAL CELLS GABRIEL R. DRAPEAU AND ROBERT A. MAcLEOD Department of Bacteriology,
More informationDr. Nafith Abu Tarboush
8 Dr. Nafith Abu Tarboush June 30 th 2013 Ahmad Ayyat Nucleic Acids: Molecules that carries information for growth and production of cells, and they are Polymers of "Nucleotides" (the monomers).01 Nucleotide
More informationBiology 112 Practice Midterm Questions
Biology 112 Practice Midterm Questions 1. Identify which statement is true or false I. Bacterial cell walls prevent osmotic lysis II. All bacterial cell walls contain an LPS layer III. In a Gram stain,
More informationModelling of molecular genetic systems in bacterial cell 73
Modelling of molecular genetic systems in bacterial cell 73 Chapter # GENE NETWOR RECONSTRUCTION AND MATHEMATICAL MODELING OF SALVAGE PATHWAYS: REGULATION OF ADENINE PHOSPHORIBOSYLTRANSFERASE ACTIVITY
More informationOptimization of Immunoblot Protocol for Use with a Yeast Strain Containing the CDC7 Gene Tagged with myc
OPTIMIZATION OF IMMUNOBLOT PROTOCOL 121 Optimization of Immunoblot Protocol for Use with a Yeast Strain Containing the CDC7 Gene Tagged with myc Jacqueline Bjornton and John Wheeler Faculty Sponsor: Anne
More informationREQUIRING MUTANTS OF ESCHERICHIA COLI
EFFECT OF ENERGY SUPPLY ON ENZYME INDUCTION BY PYRIMIDINE REQUIRING MUTANTS OF ESCHERICHIA COLI ARTHUR B. PARDEE Virus Laboratory, University of California, Berkeley, California Received for publication
More informationBIOLOGY 10/11/2014. An Introduction to Metabolism. Outline. Overview: The Energy of Life
8 An Introduction to Metabolism CAMPBELL BIOLOGY TENTH EDITION Reece Urry Cain Wasserman Minorsky Jackson Outline I. Forms of Energy II. Laws of Thermodynamics III. Energy and metabolism IV. ATP V. Enzymes
More information9/25/2011. Outline. Overview: The Energy of Life. I. Forms of Energy II. Laws of Thermodynamics III. Energy and metabolism IV. ATP V.
Chapter 8 Introduction to Metabolism Outline I. Forms of Energy II. Laws of Thermodynamics III. Energy and metabolism IV. ATP V. Enzymes Overview: The Energy of Life Figure 8.1 The living cell is a miniature
More informationDISRUPTION OF THE ESCHERICHIA COLI OUTER MEMBRANE PERMEABILITY BARRIER BY IMMOBILIZED POLYMYXIN B. KENNETH S. ROSENTHAL* and DANIEL R.
VOL. XXX NO. 12 THE JOURNAL OF ANTIBIOTICS 1087 DISRUPTION OF THE ESCHERICHIA COLI OUTER MEMBRANE PERMEABILITY BARRIER BY IMMOBILIZED POLYMYXIN B KENNETH S. ROSENTHAL* and DANIEL R. STORM Department of
More informationEnergy Transformation, Cellular Energy & Enzymes (Outline)
Energy Transformation, Cellular Energy & Enzymes (Outline) Energy conversions and recycling of matter in the ecosystem. Forms of energy: potential and kinetic energy The two laws of thermodynamic and definitions
More informationFull file at Essentials of Anatomy & Physiology (Martini/ Bartholomew) Chapter 2 The Chemical Level of Organization
Essentials of Anatomy & Physiology (Martini/ Bartholomew) Chapter 2 The Chemical Level of Organization Multiple Choice 1) An unstable isotope that emits subatomic particles spontaneously is called A) a
More informationCHAPTER 15 Metabolism: Basic Concepts and Design
CHAPTER 15 Metabolism: Basic Concepts and Design Chapter 15 An overview of Metabolism Metabolism is the sum of cellular reactions - Metabolism the entire network of chemical reactions carried out by living
More informationChapter 6- An Introduction to Metabolism*
Chapter 6- An Introduction to Metabolism* *Lecture notes are to be used as a study guide only and do not represent the comprehensive information you will need to know for the exams. The Energy of Life
More informationGene. and fl-methyl-l-arabinoside competitively inhibit the uptake of L-arabinose. arabinose metabolism, including arae. Although
JOURNAL OF BACERIOLOGY, Aug. 1972, p. 606-613 Copyright 0 1972 American Society for Microbiology Vol. 111, No. 2 Printed in U.S.A. A Second Transport System for L-Arabinose in Escherichia coli B/r Controlled
More informationMicrobiology: A Systems Approach, 2 nd ed. Chapter 2: The Chemistry of Biology
Microbiology: A Systems Approach, 2 nd ed. Chapter 2: The Chemistry of Biology 2.1 Atoms, Bonds, and Molecules: Fundamental Building Blocks Matter: anything that occupies space and has mass Can be liquid,
More informationLecture 10: Cyclins, cyclin kinases and cell division
Chem*3560 Lecture 10: Cyclins, cyclin kinases and cell division The eukaryotic cell cycle Actively growing mammalian cells divide roughly every 24 hours, and follow a precise sequence of events know as
More informationAn Introduction to Metabolism
Chapter 8 An Introduction to Metabolism Dr. Wendy Sera Houston Community College Biology 1406 Key Concepts in Chapter 8 1. An organism s metabolism transforms matter and energy, subject to the laws of
More informationUnit 2: Basic Chemistry
Unit 2: Basic Chemistry I. Matter and Energy A. Matter anything that occupies space and has mass (weight) B. Energy the ability to do work 1. Chemical 2. Electrical 3. Mechanical 4. Radiant C. Composition
More informationEFFECTS OF GROWTH CONDITIONS ON SENSITIVITY OF ESCHERICHIA COLI TO INACTIVATION BY ULTRAVIOLET AND 32P DECAY Y. YAN*
JAPAN. J. GENETICS Vol. 44, No. 5: 275-284 (1969) EFFECTS OF GROWTH CONDITIONS ON SENSITIVITY OF ESCHERICHIA COLI TO INACTIVATION BY ULTRAVIOLET AND 32P DECAY Received December 23, 1968 Y. YAN* Laboratory
More informationCoordinated Alterations in Ribosomes and Cytoplasmic
JOURNAL OF BACTERIOLOGY, Feb. 1976, p. 524-530 Copyright i 1976 American Society for Microbiology Vol. 125, No. 2 Printed in U.S.A. Coordinated Alterations in Ribosomes and Cytoplasmic Membrane in Sucrose-Dependent,
More informationChemistry 5.07SC Biological Chemistry I Fall Semester, 2013
Chemistry 5.07SC Biological Chemistry I Fall Semester, 2013 Lecture 10. Biochemical Transformations II. Phosphoryl transfer and the kinetics and thermodynamics of energy currency in the cell: ATP and GTP.
More informationSECTION J, BIOCHEMISTRY Growth Stimulation of Escherichia coli by 2-Thiouracil
289 SECTION J, BIOCHEMISTRY Growth Stimulation of Escherichia coli by 2-Thiouracil PAUL T. CARDEILHAC and ERNEST M. HODNETT, Oklahoma State University, Stillwater 2-Thiouracil has been extensively tested
More informationChapter Two: The Chemistry of Biology. The molecules of life make up the structure of cells Chemistry of biological molecule
Chapter Two: The Chemistry of Biology The molecules of life make up the structure of cells Chemistry of biological molecule Atoms and Elements: Atoms: The basic units of all matter, containing three major
More informationTHE EDIBLE OPERON David O. Freier Lynchburg College [BIOL 220W Cellular Diversity]
THE EDIBLE OPERON David O. Freier Lynchburg College [BIOL 220W Cellular Diversity] You have the following resources available to you: Short bread cookies = DNA / genetic elements Fudge Mint cookies = RNA
More informationGENES AND CHROMOSOMES III. Lecture 5. Biology Department Concordia University. Dr. S. Azam BIOL 266/
GENES AND CHROMOSOMES III Lecture 5 BIOL 266/4 2014-15 Dr. S. Azam Biology Department Concordia University CELL NUCLEUS AND THE CONTROL OF GENE EXPRESSION OPERONS Introduction All cells in a multi-cellular
More informationBiological Process Term Enrichment
Biological Process Term Enrichment cellular protein localization cellular macromolecule localization intracellular protein transport intracellular transport generation of precursor metabolites and energy
More informationBioenergetics, or biochemical thermodynamics, is the study of the energy changes accompanying biochemical reactions. Biologic systems are essentially
Bioenergetics Bioenergetics, or biochemical thermodynamics, is the study of the energy changes accompanying biochemical reactions. Biologic systems are essentially isothermic and use chemical energy to
More informationSynchronization of Cell Division in Microorganisms by Percoll
JOURNAL OF BACTERIOLOGY, Oct. 198, p. 17-21 21-9193/8/1-17/5$2./ Vol. 144, No. 1 Synchronization of Cell Division in Microorganisms by Percoll Gradients RINA D. DWEK, LIAT H. KOBRIN, NILI GROSSMAN, AND
More informationChemical Basis of Life
Chemical Basis of Life Jan 30 11:42 AM In order to understand digestion and nutrition, we need some basic biochemistry Chemistry studies the composition of matter and its changes as well as the change
More informationGACE Biology Assessment Test I (026) Curriculum Crosswalk
Subarea I. Cell Biology: Cell Structure and Function (50%) Objective 1: Understands the basic biochemistry and metabolism of living organisms A. Understands the chemical structures and properties of biologically
More informationCHAPTER 8. An Introduction to Metabolism
CHAPTER 8 An Introduction to Metabolism WHAT YOU NEED TO KNOW: Examples of endergonic and exergonic reactions. The key role of ATP in energy coupling. That enzymes work by lowering the energy of activation.
More informationTransmembrane Domains (TMDs) of ABC transporters
Transmembrane Domains (TMDs) of ABC transporters Most ABC transporters contain heterodimeric TMDs (e.g. HisMQ, MalFG) TMDs show only limited sequence homology (high diversity) High degree of conservation
More informationAn Introduction to Metabolism
CAMPBELL BIOLOGY IN FOCUS Urry Cain Wasserman Minorsky Jackson Reece 6 An Introduction to Metabolism Lecture Presentations by Kathleen Fitzpatrick and Nicole Tunbridge Overview: The Energy of Life The
More informationMetabolism and Energy. Mrs. Stahl AP Biology
Metabolism and Energy Mrs. Stahl AP Biology The Energy of Life The living cell is a miniature chemical factory where thousands of reactions occur The cell extracts energy stored in sugars and other fuels
More informationChapter 8 Notes. An Introduction to Metabolism
Chapter 8 Notes An Introduction to Metabolism Describe how allosteric regulators may inhibit or stimulate the activity of an enzyme. Objectives Distinguish between the following pairs of terms: catabolic
More informationRegulation of levels of purine biosynthetic enzymes in Bacillus subtilis: effects of changing purine nucleotide pools
Journal of General Microbiology (1991), 137, 2381-2394. Printed in Great Britain 2387 Regulation of levels of purine biosynthetic enzymes in Bacillus subtilis: effects of changing purine nucleotide pools
More informationUnit 4 Bioenergetics Test Review
Section A: Adenosine Triphosphate Unit 4 Bioenergetics Test Review Adenosine triphosphate (ATP) is the energy molecule used by all cells to do work. It is a nucleotide consisting of adenine (a base), ribose
More informationSPRINGFIELD TECHNICAL COMMUNITY COLLEGE ACADEMIC AFFAIRS
SPRINGFIELD TECHNICAL COMMUNITY COLLEGE ACADEMIC AFFAIRS Course Number: BIOL 102 Department: Biological Sciences Course Title: Principles of Biology 1 Semester: Spring Year: 1997 Objectives/ 1. Summarize
More informationBiology Slide 1 of 20
Biology 1 of 20 8-1 Energy and Life 2 of 20 8-1 Energy and Life Autotrophs and Heterotrophs Where do plants get the energy they need to produce food? Living things need energy to survive. This energy comes
More informationAnalyze Nucleotides, Nucleosides, Purine, and Pyrimidine Bases Simultaneously with the Ultra IBD Column
pharmaceutical #9 Applications note Analyze Nucleotides, Nucleosides, Purine, and Pyrimidine Bases Simultaneously with the Ultra IBD Column Mixtures of nucleotides, nucleosides, and their respective purine
More informationEnergy for biological processes
1 Energy transfer When you have finished revising this topic, you should: be able to explain the difference between catabolic and anabolic reactions be able to describe the part played by in cell metabolism
More informationBacterial Genetics & Operons
Bacterial Genetics & Operons The Bacterial Genome Because bacteria have simple genomes, they are used most often in molecular genetics studies Most of what we know about bacterial genetics comes from the
More information3.2 ATP: Energy Currency of the Cell 141
: Energy urrency of the ell Thousands of reactions take place in living cells. Many reactions require the addition of for the assembly of complex molecules from simple reactants. These reactions include
More informationAn Introduction to Metabolism
Chapter 8 1 An Introduction to Metabolism PowerPoint Lecture Presentations for Biology Eighth Edition Neil Campbell and Jane Reece Lectures by Chris Romero, updated by Erin Barley with contributions from
More information2/25/2013. Electronic Configurations
1 2 3 4 5 Chapter 2 Chemical Principles The Structure of Atoms Chemistry is the study of interactions between atoms and molecules The atom is the smallest unit of matter that enters into chemical reactions
More informationAn Introduction to Metabolism
LECTURE PRESENTATIONS For CAMPBELL BIOLOGY, NINTH EDITION Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Robert B. Jackson Chapter 8 An Introduction to Metabolism
More informationMET ABOLISM: Str uctur e and Metabolism of Nucleotide USMAN SUMO FRIEND T AMBUNAN ARLI ADIT YA PARIKESIT RIDO UT OMO
MET ABLISM: Str uctur e and Metabolism of ucleotide USMA SUM FRIED T AMBUA ARLI ADIT YA PARIKESIT RID UT M ucleotide Function Building blocks for DA and RA Intracellular source of energy - Adenosine tr
More informationBIOLOGY. An Introduction to Metabolism CAMPBELL. Reece Urry Cain Wasserman Minorsky Jackson
CAMPBELL BIOLOGY TENTH EDITION Reece Urry Cain Wasserman Minorsky Jackson 8 An Introduction to Metabolism Lecture Presentation by Nicole Tunbridge and Kathleen Fitzpatrick The Energy of Life The living
More informationZwitterionic character of nucleotides: possible significance in the evolution of nucleic acids
Volume 5 Number 11 November 1978 Nucleic Acids Research Zwitterionic character of nucleotides: possible significance in the evolution of nucleic acids M.Sundaralingam and P.Prusiner Department of Biochemistry,
More informationChapter 2: Chemical Basis of Life
Chapter 2: Chemical Basis of Life Chemistry is the scientific study of the composition of matter and how composition changes. In order to understand human physiological processes, it is important to understand
More informationBiological Pathways Representation by Petri Nets and extension
Biological Pathways Representation by and extensions December 6, 2006 Biological Pathways Representation by and extension 1 The cell Pathways 2 Definitions 3 4 Biological Pathways Representation by and
More informationAgrobacterium tumefasciens, the Ti Plasmid, and Crown Gall Tumorigenesis
Agrobacterium tumefasciens, the Ti Plasmid, and Crown Gall Tumorigenesis BOM-11: 10.9 Plasmids: General Principles (review) p. 274 10.11 Conjugation: Essential Features (review) p. 278 19.21 Agrobacterium
More informationDevelopment Team. Regulation of gene expression in Prokaryotes: Lac Operon. Molecular Cell Biology. Department of Zoology, University of Delhi
Paper Module : 15 : 23 Development Team Principal Investigator : Prof. Neeta Sehgal Department of Zoology, University of Delhi Co-Principal Investigator : Prof. D.K. Singh Department of Zoology, University
More informationChapter 2: The Chemical Basis of Life
Chapter 2: The Chemical Basis of Life I. Basic Chemistry A. Matter, Mass, and Weight 1. All living and nonliving things are composed of 2. represents the amount of matter. 3. is caused by the gravitational
More informationWHAT REGULATES RESPIRATION IN MITOCHONDRIA?
Vol. 39, No. 2, May 1996 BIOCHEMISTRY and MOLECULAR BIOLOGY INTERNATIONAL Pages 415-4 ] 9 WHAT REGULATES RESPIRATION IN MITOCHONDRIA? Bernard Korzeniewski Institute of Molecular Biology, Jagiellonian University,
More informationProkaryotic Gene Expression (Learning Objectives)
Prokaryotic Gene Expression (Learning Objectives) 1. Learn how bacteria respond to changes of metabolites in their environment: short-term and longer-term. 2. Compare and contrast transcriptional control
More informationChapter 002 The Chemistry of Biology
Chapter 002 The Chemistry of Biology Multiple Choice Questions 1. Anything that occupies space and has mass is called A. Atomic B. Living C. Matter D. Energy E. Space 2. The electrons of an atom are A.
More informationDepartment of Biology, Reuelle College, Uniuersity of California, San Diego, La Jolla, California Received August 30, 1966
ENZYME ANALYSIS OF THE TRYPTOPHAN PATHWAY IN ASPERGILLUS NIDULANS R. HUTTER2 AND J. A. DEMOSS Department of Biology, Reuelle College, Uniuersity of California, San Diego, La Jolla, California 92037 Received
More informationCHAPTER 13 PROKARYOTE GENES: E. COLI LAC OPERON
PROKARYOTE GENES: E. COLI LAC OPERON CHAPTER 13 CHAPTER 13 PROKARYOTE GENES: E. COLI LAC OPERON Figure 1. Electron micrograph of growing E. coli. Some show the constriction at the location where daughter
More informationCell and Molecular Biology
Cell and Molecular Biology (3000719): academic year 2013 Content & Objective :Cell Chemistry and Biosynthesis 3 rd Edition, 1994, pp. 41-88. 4 th Edition, 2002, pp. 47-127. 5 th Edition, 2008, pp. 45-124.
More informationENZYMATIC FORMATION OF URIDINE DIPHOSPHATE GLUCOSE WITH PREPARATIONS FROM IMPATIENS HOLSTII* N. C. GANGULIt
ENZYMATIC FORMATION OF URIDINE DIPHOSPHATE GLUCOSE WITH PREPARATIONS FROM IMPATIENS HOLSTII* BY N. C. GANGULIt (From the Department of Agricultural Biochemistry, College of Agriculture, University of California,
More informationChapter 8: Energy and Metabolism
Chapter 8: Energy and Metabolism Why do organisms need energy? How do organisms manage their energy needs? Defining terms and issues: energy and thermodynamics metabolic reactions and energy transfers
More informationMetabolism and Enzymes
Energy Basics Metabolism and Enzymes Chapter 5 Pgs. 77 86 Chapter 8 Pgs. 142 162 Energy is the capacity to cause change, and is required to do work. Very difficult to define quantity. Two types of energy:
More informationRequirement for Membrane Potential in Active Transport of
JOURNAL OF BACTERIOLOGY, Jan. 1979, p. 221-225 0021-9193/79/01-0221/05$02.00/0 Vol. 137, No. 1 Requirement for Membrane Potential in Active Transport of Glutamine by Escherichia coli CHARLES A. PLATEt
More informationObjectives INTRODUCTION TO METABOLISM. Metabolism. Catabolic Pathways. Anabolic Pathways 3/6/2011. How to Read a Chemical Equation
Objectives INTRODUCTION TO METABOLISM. Chapter 8 Metabolism, Energy, and Life Explain the role of catabolic and anabolic pathways in cell metabolism Distinguish between kinetic and potential energy Distinguish
More informationRegulation of gene expression. Premedical - Biology
Regulation of gene expression Premedical - Biology Regulation of gene expression in prokaryotic cell Operon units system of negative feedback positive and negative regulation in eukaryotic cell - at any
More informationHYDROGEN. technique. uptake/co2 uptake, which according to equation (1) should equal 4, has
184 BA CTERIOLOG Y: H. A. BARKER PROC. N. A. S. STUDIES ON THE METHANE FERMENTATION. VI. THE IN- FLUENCE OF CARBON DIOXIDE CONCENTRATION ON THE RATE OF CARBON DIOXIDE REDUCTION BY MOLECULAR HYDROGEN By
More informationEnzymatic Assay of CASEIN KINASE II
PRINCIPLE: Casein +?- 32 P-ATP Casein Kinase II > [ 32 P]-Phosphorylated Casein + ADP CONDITIONS: T = 37 C, ph 7.5 METHOD: Radiolabelled Stop Reaction REAGENTS: A. 100 mm HEPES Buffer, ph 7.5 at 37 C (Enzyme
More informationIntroduction to Microbiology BIOL 220 Summer Session I, 1996 Exam # 1
Name I. Multiple Choice (1 point each) Introduction to Microbiology BIOL 220 Summer Session I, 1996 Exam # 1 B 1. Which is possessed by eukaryotes but not by prokaryotes? A. Cell wall B. Distinct nucleus
More informationEnergy Transformation and Metabolism (Outline)
Energy Transformation and Metabolism (Outline) - Definitions & Laws of Thermodynamics - Overview of energy flow ecosystem - Biochemical processes: Anabolic/endergonic & Catabolic/exergonic - Chemical reactions
More informationKinetics of Phosphate Incorporation into Adenosine Triphosphate and Guanosine Triphosphate in Bacteria1
JouRNAL OF BACTERIOLOGY, Dec. 1973, p 1113-1123 Copyright i 1973 American Society for Microbiology Vol. 116, No. 3 Printed in U.SA. Kinetics of Phosphate Incorporation into Adenosine Triphosphate and Guanosine
More informationUNIVERSITY OF YORK. BA, BSc, and MSc Degree Examinations Department : BIOLOGY. Title of Exam: Molecular microbiology
Examination Candidate Number: Desk Number: UNIVERSITY OF YORK BA, BSc, and MSc Degree Examinations 2017-8 Department : BIOLOGY Title of Exam: Molecular microbiology Time Allowed: 1 hour 30 minutes Marking
More informationC. Incorrect! Catalysts themselves are not altered or consumed during the reaction.
Human Physiology - Problem Drill 04: Enzymes and Energy Question No. 1 of 10 Instructions: (1) Read the problem and answer choices carefully, (2) Work the problems on paper as needed, (3) Pick the answer,
More informationFull file at
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Which of the following is an uncharged particle found in the nucleus of 1) an atom and which has
More information