Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/123196
Citations
Scopus Web of Science® Altmetric
?
?
Type: Journal article
Title: Backbone-constrained peptides: temperature and secondary structure affect solid-state electron transport
Author: Guo, C.
Yu, J.
Horsley, J.R.
Sheves, M.
Cahen, D.
Abell, A.D.
Citation: Journal of Physical Chemistry B, 2019; 123(51):10951-10958
Publisher: American Chemical Society
Issue Date: 2019
ISSN: 1520-6106
1520-5207
Statement of
Responsibility: 
Cunlan Guo, Jingxian Yu, John R. Horsley, Mordechai Sheves, David Cahen, and Andrew D. Abell
Abstract: The primary sequence and secondary structure of a peptide are crucial to charge migration, not only in solution (electron transfer, ET), but also in the solid-state (electron transport, ETp). Hence, understanding the charge migration mechanisms is fundamental to the development of biomolecular devices and sensors. We report studies on four Aib-containing helical peptide analogues: two acyclic linear peptides with one and two electron-rich alkene-based side chains, respectively, and two peptides that are further rigidified into a macrocycle by a side bridge constraint, containing one or no alkene. ETp was investigated across Au/peptide/Au junctions, between 80 and 340 K in combination with the molecular dynamic (MD) simulations. The results reveal that the helical structure of the peptide and electron-rich side chain both facilitate the ETp. As temperature increases, the loss of helical structure, change of monolayer tilt angle, and increase of thermally activated fluctuations affect the conductance of peptides. Specifically, room temperature conductance across the peptide monolayers correlates well with previously observed ET rate constants, where an interplay between backbone rigidity and electron-rich side chains was revealed. Our findings provide new means to manipulate electronic transport across solid-state peptide junctions.
Keywords: Alkenes; Peptides; Temperature; Protein Structure, Secondary; Electron Transport; Molecular Dynamics Simulation
Rights: © 2019 American Chemical Society
RMID: 1000011228
DOI: 10.1021/acs.jpcb.9b07753
Grant ID: http://purl.org/au-research/grants/arc/DP180101581
Appears in Collections:Chemical Engineering publications

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.