Paper Info
Title
beta-Hairpins, alpha-helices, and the intermediates among the secondary structures in the energy landscape of a peptide from a distal beta-hairpin of SH3 domain.
Abstract
Energy landscape of a peptide, extracted from a distal beta-hairpin of src SH3 domain, in explicit water was obtained with the multicanonical molecular dynamics. A variety of beta-hairpins with various strand-strand hydrogen bonds were found in the energy landscape at 300 K. There was no energy barrier between random-coil and hairpins. Thus, the peptide conformation can easily change from the random-coil to the hairpins in the thermal fluctuations at 300 K. The landscape also included two clusters of alpha-helices, among which an energy barrier existed, and besides, these helix clusters were separated from the other conformations. Thus, the free-energy barrier exists among the helices and the other conformations. Intermediate clusters were found between the helix and the hairpin clusters. The current study showed that the isolated state of this peptide in water fluctuates among random-coil, beta-hairpin, and alpha-helix. In SH3 domain, which has a topology of mainly beta-protein, the whole-protein folding may proceed when the segment is folded in the beta-hairpin and the other parts of the protein are coupled with the beta-hairpin in an energetically or kinetically favorite way. (C) 2003 Wiley Periodicals, Inc.
Year
DOI
Venue
2003
10.1002/jcc.10160
JOURNAL OF COMPUTATIONAL CHEMISTRY
Keywords
DocType
Volume
multicanonical molecular dynamics,principal component analysis,folding pathway,intermediate,secondary structure
Journal
24
Issue
ISSN
Citations 
3
0192-8651
0
PageRank 
References 
Authors
0.34
0
4
Name
Order
Citations
PageRank
Kazuyoshi Ikeda1241.30
Oxana V. Galzitskaya212520.15
Haruki Nakamura355072.85
Junichi Higo42210.94