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Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
Published on: July 16, 2017
Spectral analysis of a protein conformational switch
1Department of Pharmacology and Systems Therapeutics, Mount Sinai School of Medicine of NYU, New York, New York 10029, USA. Shalom.Rackovsky@mssm.edu
Physical Review Letters
|July 21, 2011
Summary
Single amino acid mutations can cause significant protein conformational changes, challenging current folding physics. Global sequence analysis is crucial for understanding protein structure, as local methods can be misleading.
Area of Science:
- Protein folding physics
- Structural biology
- Biophysics
Background:
- Conformational switching in proteins, triggered by single amino acid mutations, poses a significant challenge to understanding protein folding.
- Sequence-local methods, frequently employed for structural homology detection, are insufficient for explaining this phenomenon.
Purpose of the Study:
- To investigate how single amino acid mutations induce conformational changes in proteins.
- To evaluate the efficacy of sequence-local versus global sequence analysis in predicting protein structure and function.
Main Methods:
- Analysis of protein sequences from the G(A) and G(B) domains of Streptococcus protein G.
- Comparison of local sequence identity with global patterns of physical properties.
- Correlation of physical property differences with observed conformational changes.
Main Results:
- Proteins with nearly identical local sequences exhibited markedly different global physical property patterns.
- These global differences in physical properties were consistent with observed drastic conformational changes.
- Sequence-local methods were found to be inadequate for predicting these conformational shifts.
Conclusions:
- Single-residue mutations can lead to substantial protein conformational changes.
- Global sequence analysis provides a more accurate approach for understanding protein sequence-structure relationships than sequence-local methods.
- Rethinking homology detection methods is necessary to account for conformational plasticity.
