Cited by 35Protein Structure and DynamicsRNA and protein synthesis mechanismsAdvanced Physical and Chemical Molecular Interactions

Folding kinetics and unfolded state dynamics of the GB1 hairpin from molecular simulation

De Sancho, David, Mittal, Jeetain, Best, Robert B.·2013·Journal of Chemical Theory and Computation

Abstract

The C-terminal β-hairpin of protein G is a 16-residue peptide that folds in a two-state fashion akin to many larger proteins. However, with an experimental folding time of ∼6 μs, it remains a challenging system for all-atom, explicitly solvated, molecular dynamics simulations. Here, we use a large simulation data set (0.7 ms total) of the hairpin at 300 and 350 K to interpret its folding via a master equation approach. We find a separation of over an order of magnitude between the longest and second longest relaxation times, with the slowest relaxation corresponding to folding. However, in spite of this apparent two-state dynamics, the folding rate determined based on a first-passage time analysis depends on the initial conditions chosen, with a nonexponential distribution of first passage times being obtained in some cases. Using the master equation model, we are now able to account quantitatively for the observed distribution of first passage times. The deviation from the expected exponential distribution for a two-state system arises from slow dynamics in the unfolded state, associated with formation and melting of helical structures. Our results help to reconcile recent findings of slow dynamics in unfolded proteins with observed two-state folding kinetics. At the same time, they indicate that care is required in estimating folding kinetics from many short folding simulations. Last, we are able to use the master equation model to obtain details of the folding mechanism and folding transition state, which appear consistent with the "zipper" mechanism inferred from the experiment.

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Crossref · 10.1021/ct301033r

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  • The MSM approach has led to the construction of extremely detailed statistical models of folding mechanism and unfolded state dynamics for some small peptides and proteins.

    “By contrast, the MSM approach has led to the construction of extremely detailed statistical models of folding mechanism and unfolded state dynamics for some small peptides and proteins (e.g. [44, 45]).”

    From Markov state models of biomolecular conformational dynamics (2014) · cites this paper as [44]

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Authors
De Sancho, D., Mittal, J., & Best, R. B.
Affiliations
  • Cambridge University, Department of Chemistry, Lensfield Road Cambridge CB2 1EW, United Kingdom
  • Department of Chemical Engineering, 111 Research Drive, Iacocca Hall, Bethlehem, Pennsylvania 18015, United States
  • National Institutes of Health (US)
Corresponding author
Best, Robert B.
Venue
Journal of Chemical Theory and Computation
Published
2013-02-07
Volume
9
Issue
3
Pages
1743-1753
ISSN
  • 1549-9618 (ISSN-L)
  • 1549-9626
OpenAlex
W2327274849
Cited by
35
References
70
Citations by year
2026: 1 · 2024: 1 · 2023: 2 · 2021: 2 · 2020: 1 · 2019: 3 · 2018: 4 · 2017: 1 · 2016: 4 · 2015: 9 · 2014: 4 · 2013: 3
FWCI
2.98
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Chemical Theory and Computation (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › RNA and protein synthesis mechanisms
  • Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Advanced Physical and Chemical Molecular Interactions
Keywords
protein G, folding kinetics, two-state folding, master equation, first passage time distribution, non-exponential kinetics, folding transition state, zipper mechanism, relaxation time

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