Journal
PHYSICAL REVIEW LETTERS
Volume 101, Issue 15, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.101.158102
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Funding
- NIH [GM-048043]
- Duke Center for Theoretical and Mathematical Sciences
- University of Cyprus
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In the soft-wet environment of biomolecular electron transfer, it is possible that structural fluctuations could wash out medium-specific electronic effects on electron tunneling rates. We show that beyond a transition distance (2-3 angstrom in water and 6-7 angstrom in proteins), fluctuation contributions to the mean-squared donor-to-acceptor tunneling matrix element are likely to dominate over the average matrix element. Even though fluctuations dominate the tunneling mechanism at larger distances, we find that the protein fold is remembered by the electronic coupling, and structure remains a key determinant of electron transfer kinetics.
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