Chemical Shift Restraints Tools and Methods. Andrea Cavalli
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1 Chemical Shift Restraints Tools and Methods Andrea Cavalli
2 Overview
3 Methods Overview
4 Methods Details Overview
5 Methods Details Results/Discussion Overview
6 Methods
7 Methods Cheshire base solid-state
8 Methods Cheshire base solid-state CamShift new predictor Monte Carlo/Molecular Dynamics
9 Methods Cheshire base solid-state CamShift new predictor Monte Carlo/Molecular Dynamics CamDock protein-protein docking
10 About CHESHIRE: CHEmical SHifts REstraints
11 About CHESHIRE: CHEmical SHifts REstraints 3D structure determination from NMR chemical shifts.
12 About CHESHIRE: CHEmical SHifts REstraints 3D structure determination from NMR chemical shifts. Chemical shifts are easy to measure
13 About CHESHIRE: CHEmical SHifts REstraints 3D structure determination from NMR chemical shifts. Chemical shifts are easy to measure Can be measured with great accuracy
14 About CHESHIRE: CHEmical SHifts REstraints 3D structure determination from NMR chemical shifts. Chemical shifts are easy to measure Can be measured with great accuracy Contain a lot of structural informations (CSI, TALOS,...)
15 About CHESHIRE: CHEmical SHifts REstraints 3D structure determination from NMR chemical shifts. Chemical shifts are easy to measure Can be measured with great accuracy Contain a lot of structural informations (CSI, TALOS,...) In some cases they are the only available data
16 About CHESHIRE: CHEmical SHifts REstraints 3D structure determination from NMR chemical shifts. Chemical shifts are easy to measure Can be measured with great accuracy Contain a lot of structural informations (CSI, TALOS,...) In some cases they are the only available data but...
17 NOE-NMR vs CHESHIRE
18 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances
19 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances Chemical shifts values are indirectly related to geometry (SHIFTX, CamShift)
20 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances Chemical shifts values are indirectly related to geometry (SHIFTX, CamShift) NOEs have long-range information
21 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances Chemical shifts values are indirectly related to geometry (SHIFTX, CamShift) NOEs have long-range information Chemical shifts are local
22 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances Chemical shifts values are indirectly related to geometry (SHIFTX, CamShift) NOEs have long-range information Chemical shifts are local NOEs are redundant
23 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances Chemical shifts values are indirectly related to geometry (SHIFTX, CamShift) NOEs have long-range information Chemical shifts are local NOEs are redundant There is only one chemical shift per atom
24 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances Chemical shifts values are indirectly related to geometry (SHIFTX, CamShift) NOEs have long-range information Chemical shifts are local NOEs are redundant There is only one chemical shift per atom Clear quality control (number of assigned NOEs, NOEs violation)
25 NOE-NMR vs CHESHIRE NOEs have a direct structural interpretation as distances Chemical shifts values are indirectly related to geometry (SHIFTX, CamShift) NOEs have long-range information Chemical shifts are local NOEs are redundant There is only one chemical shift per atom Clear quality control (number of assigned NOEs, NOEs violation) Weak Q-factor
26 Idea
27 Idea Force field -920 Free Energy Cα-RMSD
28 Idea Force field Chemical shifts Free Energy Chemical Shift Cα-RMSD Cα-RMSD
29 Idea Force field Combined score Chemical shifts Free Energy Chemical Shift Chemical Shift Cα-RMSD Cα-RMSD Cα-RMSD
30 Idea Force field Combined score Chemical shifts Free Energy Chemical Shift Chemical Shift Cα-RMSD Cα-RMSD Cα-RMSD Structures have to be very close to the native one in order to feel chemical shifts score.
31 CHESHIRE Determination or prediction? Experiment Theory
32 CHESHIRE Determination or prediction? X-ray NMR Experiment Theory
33 CHESHIRE Determination or prediction? X-ray NMR ab initio Experiment Theory
34 CHESHIRE Determination or prediction? X-ray NMR Homology modeling > 50 % Homology modeling < 50 % ab initio Experiment Theory
35 CHESHIRE Determination or prediction? X-ray NMR Homology modeling > 50 % CHESHIRE Homology modeling < 50 % ab initio Experiment Theory
36 CHESHIRE Determination or prediction? Jigsaw puzzle
37 Steps Chemical shifts Prediction of local geometry Database SCOP domains Fragment selection SHIFX Fragment assembly Energy function Refinement
38 Local structure 1 Chemical shifts Prediction of local geometry Database Secondary structure prediction P 3 (S 1,S 2,S 3 AA 1,AA 2,AA 3 ), P cs (S Hα,N,Cα,Cβ,AA) E = N N i=1logp 3 (i) K cs logp cs (i) i=1 Secondary structure propensity P(S A)= N S N
39 Local structure 2 Chemical shifts Prediction of local geometry Database Torsion angle prediction S(Φ i,ψ i A,CS)=Sym(B,A)+Sym( CS A, CS B )+Sym(S A,S B ) Three best scoring cluster centers are taken as prediction.
40 Fragment selection Chemical shifts Fragment selection Database E = Fragments of length 3 and 9 aa N N i=1e cs (A i, CS A,B i, CS B )+K tor E tar (Φ i,ψ i,b) i=1 Performance Protein 3Pred TOPOS Ubiquitin FF domain Calbindin HPR
41 Fold Fragment assembly Energy function
42 Fold Fragment assembly Energy function
43 Refinement 1 Chemical shifts Refinement Energy function Energy function E re f = E ff /log(1 C cs ) where C cs = K χ (1 C χ ), C χ correlation of CS type χ χ {Hα,N,Cα,Cβ}
44 Refinement 2
45 Refinement 2 Structure with large Rg are discarded
46 Refinement 2 Structure with large Rg are discarded Side-chains are added
47 Refinement 2 Structure with large Rg are discarded Side-chains are added Initial ranking
48 Refinement 2 Takes one structure at random from the best-list. New structure generated by simulated annealing. Structure with large Rg are discarded Side-chains are added Initial ranking Keeps a list of the 100 best structures
49 Results
50 Results
51 The largest
52 The largest 2GW6, 123 aa 1.72 Å backbone RMSD
53 The smallest
54 The smallest 1PV0, 46 aa 1.37 Å backbone RMSD
55 Solid-State NMR of protein G
56 Solid-State NMR of protein G
57 Solid-State NMR of protein G Structure RMSD N (5.5 A ) Q (RDC) 1P7F GB GB JU K0P
58 Failures
59 Failures 0 S = *NA, R= Score Number of Amino Acids
60 Failures 1ZGG S = *NA, R= Refined Structures Refined Native Structure Expected Score Score -400 Score Score Number of Amino Acids C!-RMSD C!-RMSD
61 Failures 1ZGG S = *NA, R= Refined Structures Refined Native Structure Expected Score Score -400 Score Score Number of Amino Acids C!-RMSD C!-RMSD Why? Usually because the assembly stage does not generate low RMSD models.
62 CamShift
63 CamShift Chemical shifts are predicted using distances to neighboring atoms R N C C H H O R N C C H H O
64 CamShift Chemical shifts are predicted using distances to neighboring atoms Accurate as ShiftX or Sparta and orders of magnitude faster R N C C H H O R N C C H H O
65 CamShift Chemical shifts are predicted using distances to neighboring atoms Accurate as ShiftX or Sparta and orders of magnitude faster CamShift with physical force field and ReX molecular dynamics N R C C H H R N C C H H O O
66 CamShift Chemical shifts are predicted using distances to neighboring atoms Accurate as ShiftX or Sparta and orders of magnitude faster CamShift with physical force field and ReX molecular dynamics ~ 1 A from unfolded for small proteins (1uzc, 1ubq,..) N R C C H H R N C C H H O O
67 CamShift-MD 2jvw: 61 residues Lowest Energy Structure 1.41Å RMSD 2jva: 108 residues Lowest Energy Structure 1.98 Å RMSD
68 CamShift Full No Long range Sparta HN HA N CA CB CO
69 Conclusions
70 Conclusions Protein structure determination with chemical shifts is possible...
71 Conclusions Protein structure determination with chemical shifts is possible... but difficult... very difficult...
72 Conclusions Protein structure determination with chemical shifts is possible... but difficult... very difficult... CHESHIRE works (at the moment) for proteins up to ~100 aa.
73 Conclusions Protein structure determination with chemical shifts is possible... but difficult... very difficult... CHESHIRE works (at the moment) for proteins up to ~100 aa. results are stable ~ Å Cα RMSD.
74 Conclusions Protein structure determination with chemical shifts is possible... but difficult... very difficult... CHESHIRE works (at the moment) for proteins up to ~100 aa. results are stable ~ Å Cα RMSD. self-consistent criterion to (maybe) detect failures of the method.
75 Conclusions Protein structure determination with chemical shifts is possible... but difficult... very difficult... CHESHIRE works (at the moment) for proteins up to ~100 aa. results are stable ~ Å Cα RMSD. self-consistent criterion to (maybe) detect failures of the method. can be used for complexes and with solid-state CS.
76 Conclusions Protein structure determination with chemical shifts is possible... but difficult... very difficult... CHESHIRE works (at the moment) for proteins up to ~100 aa. results are stable ~ Å Cα RMSD. self-consistent criterion to (maybe) detect failures of the method. can be used for complexes and with solid-state CS.
77 Acknowledgments Michele Vendruscolo Chris Dobson Xavier Salvatella Kai Kohlhof Paul Robustelli Danny Hsu Rinaldo Wander Montalvao
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