Cited by 75Protein Structure and DynamicsNonlinear Photonic SystemsNonlinear Dynamics and Pattern Formation

Discrete breathers in protein structures

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Piazza, Francesco, Sanejouand, Yves-Henri·2008·Physical Biology

Abstract

Recently, using a numerical surface cooling approach, we have shown that highly energetic discrete breathers (DBs) can form in the stiffest parts of nonlinear network models of large protein structures. In the present study, using an analytical approach, we extend our previous results to low-energy discrete breathers as well as to smaller proteins. We confirm and further scrutinize the striking site selectiveness of energy localization in the presence of spatial disorder. In particular, we find that, as a sheer consequence of disorder, a non-zero energy gap for exciting a DB at a given site either exists or not. Remarkably, in the former case, the gaps arise as a result of the impossibility of exciting small-amplitude modes in the first place. In contrast, in the latter case, a small subset of linear edge modes acts as accumulation points, whereby DBs can be continued to arbitrary small energies, while unavoidably approaching one of such normal modes. In particular, the case of the edge mode seems peculiar, its dispersion relation being simple and little system dependent. Concerning the structure-dynamics relationship, we find that the regions of protein structures where DBs form easily (zero or small gaps) are unfailingly the most highly connected ones, also characterized by weak local clustering. Remarkably, a systematic analysis on a large database of enzyme structures reveals that amino-acid residues involved in catalysis tend to be located in such regions. This finding reinforces the idea that localized modes of nonlinear origin may play an important biological role, e.g., by providing a ready channel for energy storage and/or contributing to lower energy barriers of chemical reactions.

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Authors
Piazza, F., & Sanejouand, Y.-H.
Affiliations
  • École Polytechnique Fédérale de Lausanne (CH)
  • École Normale Supérieure de Lyon (FR)
Venue
Physical Biology
Published
2008-05-01
Volume
5
Issue
2
Pages
026001
ISSN
  • 1478-3967 (ISSN-L)
  • 1478-3975
OpenAlex
W2065371880
Cited by
75
References
64
Citations by year
2026: 1 · 2025: 1 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 3 · 2019: 4 · 2018: 2 · 2017: 3 · 2016: 8 · 2015: 3 · 2014: 11 · 2013: 8 · 2012: 6
FWCI
2.60
Type
journal article
Language
en
Open access
Locations
  • Physical Biology (publishedVersion)
  • PubMed (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • HAL (submittedVersion)
  • Florence Research (University of Florence) (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion)
  • Infoscience (Ecole Polytechnique Fédérale de Lausanne) (submittedVersion, cc-by-nc-nd)
  • arXiv (Cornell University)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Protein Structure and Dynamics
  • Physical Sciences › Physics and Astronomy › Statistical and Nonlinear Physics › Nonlinear Photonic Systems
  • Physical Sciences › Computer Science › Computer Networks and Communications › Nonlinear Dynamics and Pattern Formation
Keywords
discrete breathers, protein structure, energy localization, spatial disorder, nonlinear network model, edge states, site selectivity, protein connectivity, local clustering, enzyme catalytic residues, structure-dynamics relationship
MeSH terms
Computer Simulation, Protein Conformation, Proteins, Thermodynamics

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