Document Detail


Role of hydrophobic core on the thermal stability of proteins - molecular dynamics simulations on a single point mutant of sso7d abstract.
MedLine Citation:
PMID:  22292954     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The role of salt bridges in chromatin protein Sso7d, from S. solfataricus has previously been shown to be crucial for its unusual high thermal stability. Experimental studies have shown that single site mutation of Sso7d (F31A) leads to a substantial decrease in the thermal stability of this protein due to distortion of the hydrophobic core. In the present study, we have performed a total of 0.2__s long molecular dynamics (MD) simulations on F31A at room temperature, and at 360_K, close to the melting temperature of the wild type (WT) protein to investigate the role of hydrophobic core on protein stability. Sso7d-WT was shown to be stable at both 300 and 360_K; however, F31A undergoes denaturation at 360_K, consistent with experimental results. The structural and energetic properties obtained using the analysis of MD trajectories indicate that the single mutation results in high flexibility of the protein, and loosening of intramolecular interactions. Correlation between the dynamics of the salt bridges with the structural transitions and the unfolding pathway indicate the importance of both salt bridges and hydrophobic in effecting thermal stability of proteins in general.
Authors:
U D Priyakumar
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of biomolecular structure & dynamics     Volume:  29     ISSN:  1538-0254     ISO Abbreviation:  J. Biomol. Struct. Dyn.     Publication Date:  2012 Apr 
Date Detail:
Created Date:  2012-02-01     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8404176     Medline TA:  J Biomol Struct Dyn     Country:  United States    
Other Details:
Languages:  eng     Pagination:  961-71     Citation Subset:  IM    
Affiliation:
Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad 500 032, India. deva@iiit.ac.in_
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