Cited by 477Protein Structure and DynamicsAdvanced Physical and Chemical Molecular InteractionsRNA and protein synthesis mechanisms

Coarse master equations for peptide folding dynamics

Buchete, Nicolae-Viorel, Hummer, Gerhard·2008·The Journal of Physical Chemistry B

Abstract

We construct coarse master equations for peptide folding dynamics from atomistic molecular dynamics simulations. A maximum-likelihood propagator-based method allows us to extract accurate rates for the transitions between the different conformational states of the small helix-forming peptide Ala5. Assigning the conformational states by using transition paths instead of instantaneous molecular coordinates suppresses the effects of fast non-Markovian dynamics. The resulting master equations are validated by comparing their analytical correlation functions with those obtained directly from the molecular dynamics simulations. We find that the master equations properly capture the character and relaxation times of the entire spectrum of conformational relaxation processes. By using the eigenvectors of the transition rate matrix, we are able to systematically coarse-grain the system. We find that a two-state description, with a folded and an unfolded state, roughly captures the slow conformational dynamics. A four-state model, with two folded and two unfolded states, accurately recovers the three slowest relaxation process with time scales between 1.5 and 7 ns. The master equation models not only give access to the slow conformational dynamics but also shed light on the molecular mechanisms of the helix-coil transition.

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Crossref · 10.1021/jp0761665

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  • The core-based projection method was first introduced for MSM construction in [22].

    “An alternative approach is the core-based projection method, long familiar to the transition path sampling community but first introduced for MSM construction in [22].”

    From Markov state models of biomolecular conformational dynamics (2014) · cites this paper as [22]

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Authors
Buchete, N.-V., & Hummer, G.
Affiliations
National Institutes of Health (US)
Corresponding author
Hummer, Gerhard
Venue
The Journal of Physical Chemistry B
Published
2008-01-31
Volume
112
Issue
19
Pages
6057-6069
ISSN
  • 1520-5207 (ISSN-L)
  • 1520-6106
OpenAlex
W2025899185
Cited by
477
References
65
Citations by year
2026: 8 · 2025: 17 · 2024: 14 · 2023: 20 · 2022: 23 · 2021: 23 · 2020: 30 · 2019: 34 · 2018: 35 · 2017: 32 · 2016: 37 · 2015: 31 · 2014: 26 · 2013: 34 · 2012: 31
FWCI
11.02
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physical Chemistry B (publishedVersion)
  • PubMed (publishedVersion)
  • MPG.PuRe (Max Planck Society) (submittedVersion)
Funders
National Institutes of Health
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Advanced Physical and Chemical Molecular Interactions
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
Keywords
helix-coil transition, conformational relaxation, transition rate matrix, transition pathways, non-Markovian dynamics, two-state model, four-state model, relaxation time, correlation functions
MeSH terms
Computer Simulation, Models, Molecular, Peptides, Temperature, Time Factors, Protein Structure, Tertiary, Protein Folding

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