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Anders Irbäck. Photo.

Anders Irbäck

Professor

Anders Irbäck. Photo.

Protein folding in the absence of a clear free-energy barrier

Author

  • Anders Irbäck

Summary, in English

Many small proteins fold in a two-state manner, the rate-limiting step being the passage of the free-energy barrier separating the unfolded state from the native one. The free-energy barrier is, however, weak or absent for the fastest-folding proteins. Here a simple diffusion picture for such proteins is discussed. It is tested on a model protein that makes a three-helix bundle. Assuming the motion along individual reaction coordinates to be diffusive on timescales beyond the reconfiguration time for a single helix, it is found that the relaxation time can be predicted within a factor of two. It is also shown that melting curves for this protein to a good approximation can be described in terms of a simple two-state system, despite the absence of a clear free-energy barrier.

Department/s

  • Computational Biology and Biological Physics

Publishing year

2003

Language

English

Pages

4867-4878

Publication/Series

Acta Physica Polonica. Series B: Elementary Particle Physics, Nuclear Physics, Statistical Physics, Theory of Relativity, Field Theory

Volume

34

Issue

10

Document type

Journal article

Publisher

Jagellonian University, Cracow, Poland

Topic

  • Biophysics

Status

Published

ISBN/ISSN/Other

  • ISSN: 0587-4254