Importance of mutant position in Ramachandran plot for predicting protein stability of surface mutations - PubMed (original) (raw)
. 2002 Aug 5;64(4):210-20.
doi: 10.1002/bip.10125.
Affiliations
- PMID: 12115138
- DOI: 10.1002/bip.10125
Importance of mutant position in Ramachandran plot for predicting protein stability of surface mutations
M Michael Gromiha et al. Biopolymers. 2002.
Abstract
Understanding the mechanisms by which mutations affect protein stability is one of the most important problems in molecular biology. In this work, we analyzed the relationship between changes in protein stability caused by surface mutations and changes in 49 physicochemical, energetic, and conformational properties of amino acid residues. We found that the hydration entropy was the major contributor to the stability of surface mutations in helical segments; other properties responsible for size and volume of molecule also correlated significantly with stability. Classification of coil mutations based on their locations in the (phi-psi) map improved the correlation significantly, demonstrating the existence of a relationship between stability and strain energy, which indicates that the role of strain energy is very important for the stability of surface mutations. We observed that the inclusion of sequence and structural information raised the correlation, indicating the influence of surrounding residues on the stability of surface mutations. Further, we examined the previously reported "inverse relationship" between stability and hydrophobicity, and observed that the inverse hydrophobic effect was generally applicable only to coil mutations. The present study leads to a simple method for predicting protein stability changes caused by amino acid substitutions, which will be useful for protein engineering in designing novel proteins with increased stability and altered function.
Copyright 2002 Wiley Periodicals, Inc. Biopolymers 64: 210-220, 2002
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