Topology, Landscapes, and Biomolecular Energy Transport

Published: October 11, 2019

Author(s)

Justin E. Elenewski, Kirill Velizhanin, Michael P. Zwolak

Abstract

While ubiquitous, energy redistribution remains a poorly understood facet of the nonequilibrium thermodynamics of biomolecules. At the molecular level, finite-size effects, pronounced nonlinearities, and ballistic processes conspire to produce behavior that diverges from the macroscale. Here, we show that transient thermal transport reflects macromolecular energy landscape architecture through both (i) the topological characteristics of the conformational ensemble and (ii) the nonlinear processes that mediate dynamics. While the former determines transport pathways via molecular contacts, the latter reflects the ruggedness of the landscape for local motion of atoms and molecular fragments. Unlike transport through small–molecule systems, such as alkanes, nonlinearity dominates over coherent processes at even quite short time- and length-scales. Our exhaustive all-atom simulations and novel local-in-time and space analysis, applicable to both theory and experiment, permit dissection of energy migration in biomolecules. The approach demonstrates that vibrational energy transport can probe otherwise inaccessible aspects of macromolecular dynamics and interactions that underly biological function.
Citation: Nature Communications
Volume: 10
Issue: 1
Pub Type: Journals

Keywords

biomolecules, nonlinearity, thermal transport, energy landscape, protein, biophysics, heat, free energy landscape, molecular dynamics
Created October 11, 2019, Updated October 17, 2019