An entropy criterion to detect minimally frustrated intermediates in native proteins

被引:23
作者
Compiani, M
Fariselli, P
Martelli, PL
Casadio, R
机构
[1] Univ Camerino, Dipartimento Sci Chim, I-62032 Camerino, MC, Italy
[2] Univ Bologna, Lab Biofis, I-40126 Bologna, Italy
关键词
D O I
10.1073/pnas.95.16.9290
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The analysis of the information flow in a feed-forward neural network suggests that the output of the network can be used to compute a structural entropy for the sequence-to-secondary structure mapping. On this basis, me formulate a minimum entropy criterion For the identification of minimally frustrated traits with helical conformation that correspond to initiation sites of protein folding. The entropy of protein segments can be viewed as a nucleation propensity that is useful to characterize putative regions where folding is likely to be initiated with the formation of stretches of a-helices under the predominant influence of local interactions. Our procedure is successfully tested in the search for initiation sites of protein folding for which independent experimental and computational evidence exists. Our results lend support to the view that folding is a hierarchical event in which, in harmony with the minimal frustration principle, the final conformation preserves structural modules formed in the early stages of the process.
引用
收藏
页码:9290 / 9294
页数:5
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