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

J Phys Chem B. 2016 Feb 11;120(5):926-35. doi: 10.1021/acs.jpcb.5b11767. Epub 2016 Feb 1.

Abstract

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.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Kinetics
  • Markov Chains
  • Molecular Dynamics Simulation*
  • Protein Folding
  • Proteins / chemistry*
  • Salts / chemistry

Substances

  • Proteins
  • Salts