A spin-1 representation for dual-funnel energy landscapes
Abstract
The interconversion between the left- and right-handed helical folds of a polypeptide defines a dual-funneled free energy landscape. In this context, the funnel minima are connected through a continuum of unfolded conformations, evocative of the classical helix-coil transition. Physical intuition and recent conjectures suggest that this landscape can be mapped by assigning a left- or right-handed helical state to each residue. In this study, we explore this possibility using all-atom replica exchange molecular dynamics and an Ising-like model, demonstrating that the energy landscape architecture is at odds with a two-state picture. A three-state model—left, right, and unstructured—can account for most key intermediates during chiral interconversion. Additionally, competing folds and excited conformational states still impose limitations on the scope of this approach. However, the improvement is stark: Moving from a two-state to a three-state model decreases the fit error from 1.6 kBT to 0.3 kBT along the left-to-right interconversion pathway.
- Authors:
-
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States); Univ. of Maryland, College Park, MD (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1471315
- Report Number(s):
- LA-UR-18-28756
Journal ID: ISSN 0021-9606
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Chemical Physics
- Additional Journal Information:
- Journal Volume: 149; Journal Issue: 3; Journal ID: ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Citation Formats
Elenewski, Justin E., Velizhanin, Kirill A., and Zwolak, Michael. A spin-1 representation for dual-funnel energy landscapes. United States: N. p., 2018.
Web. doi:10.1063/1.5036677.
Elenewski, Justin E., Velizhanin, Kirill A., & Zwolak, Michael. A spin-1 representation for dual-funnel energy landscapes. United States. doi:https://doi.org/10.1063/1.5036677
Elenewski, Justin E., Velizhanin, Kirill A., and Zwolak, Michael. Fri .
"A spin-1 representation for dual-funnel energy landscapes". United States. doi:https://doi.org/10.1063/1.5036677. https://www.osti.gov/servlets/purl/1471315.
@article{osti_1471315,
title = {A spin-1 representation for dual-funnel energy landscapes},
author = {Elenewski, Justin E. and Velizhanin, Kirill A. and Zwolak, Michael},
abstractNote = {The interconversion between the left- and right-handed helical folds of a polypeptide defines a dual-funneled free energy landscape. In this context, the funnel minima are connected through a continuum of unfolded conformations, evocative of the classical helix-coil transition. Physical intuition and recent conjectures suggest that this landscape can be mapped by assigning a left- or right-handed helical state to each residue. In this study, we explore this possibility using all-atom replica exchange molecular dynamics and an Ising-like model, demonstrating that the energy landscape architecture is at odds with a two-state picture. A three-state model—left, right, and unstructured—can account for most key intermediates during chiral interconversion. Additionally, competing folds and excited conformational states still impose limitations on the scope of this approach. However, the improvement is stark: Moving from a two-state to a three-state model decreases the fit error from 1.6 kBT to 0.3 kBT along the left-to-right interconversion pathway.},
doi = {10.1063/1.5036677},
journal = {Journal of Chemical Physics},
number = 3,
volume = 149,
place = {United States},
year = {2018},
month = {7}
}
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