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Type: Journal article
Title: Energy landscapes of a pair of adsorbed peptides
Author: Ross-Naylor, J.A.
Mijajlovic, M.
Biggs, M.J.
Citation: Journal of Physical Chemistry B, 2020; 124(12):2401-2409
Publisher: American Chemical Society
Issue Date: 2020
ISSN: 1520-5207
Statement of
James A. Ross-Naylor, Milan Mijajlovic and Mark J. Biggs
Abstract: The wide relevance of peptide adsorption in natural and synthetic contexts means it has attracted much attention. Molecular dynamics (MD) simulation has been widely used in these endeavors. Much of this has focused on single peptides due to the computational effort required to capture the rare events that characterize their adsorption. This focus is, however, of limited practical relevance as in reality, most systems of interest operate in the nondilute regime where peptides will interact with other adsorbed peptides. As an alternative to MD simulation, we have used energy landscape mapping (ELM) to investigate two met-enkephalin molecules adsorbed at a gas/graphite interface. Major conformations of the adsorbed peptides and the connecting transition states are elucidated along with the associated energy barriers and rates of exchange. The last of these makes clear that MD simulations are currently of limited use in probing the co-adsorption of two peptides, let alone more. The constant volume heat capacity as a function of temperature is also presented. Overall, this study represents a significant step toward characterizing peptide adsorption beyond the dilute limit.
Rights: © 2020 American Chemical Society
RMID: 1000016874
DOI: 10.1021/acs.jpcb.0c00859
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Appears in Collections:Physics publications

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