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Long-range donor-acceptor electron transport mediated by α helices.

Brizhik, L. S. and Luo, J. and Piette, B. M. A. G. and Zakrzewski, W. J. (2019) 'Long-range donor-acceptor electron transport mediated by α helices.', Physical review E.r, 100 (6). 062205.


We study the long-range electron and energy transfer mediated by a polaron on an α-helix polypeptide chain coupled to donor and acceptor molecules at opposite ends of the chain. We show that for specific parameters of the system, an electron initially located on the donor can tunnel onto the α helix, forming a polaron, which then travels to the other extremity of the polypeptide chain, where it is captured by the acceptor. We consider three families of couplings between the donor, the acceptor, and the chain and show that one of them can lead to a 90% efficiency of the electron transport from donor to acceptor. We also show that this process remains stable at physiological temperatures in the presence of thermal fluctuations in the system.

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Publisher statement:Reprinted with permission from the American Physical Society: Brizhik, L. S., Luo, J., Piette, B. M. A. G. & Zakrzewski, W. J. (2019). Long-range donor-acceptor electron transport mediated by α helices. Physical Review E 100(6): 062205.© 2019 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.
Date accepted:03 December 2019
Date deposited:08 January 2020
Date of first online publication:19 December 2019
Date first made open access:08 January 2020

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