Using Kinetic Network Models To Probe Non-Native Salt-Bridge Effects on α-Helix Folding

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• 作者：Guangfeng Zhou ; Vincent A. Voelz
• 刊名：Journal of Physical Chemistry B
• 出版年：2016
• 出版时间：February 11, 2016
• 年：2016
• 卷：120
• 期：5
• 页码：926-935
• 全文大小：626K
• ISSN：1520-5207

文摘

Salt–bridge interactions play an important role in stabilizing many protein structures, and have been shown to be designable features for protein design. In this work, we study the effects of non-native salt bridges on the folding of a soluble alanine-based peptide (Fs peptide) using extensive all-atom molecular dynamics simulations performed on the Folding@home distributed computing platform. Using Markov State Models, we show how non-native salt-bridges affect the folding kinetics of Fs peptide by perturbing specific conformational states. Furthermore, we present methods for the automatic detection and analysis of such states. These results provide insight into helix folding mechanisms and useful information to guide simulation-based computational protein design.