Journal
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
Volume 142, Issue 45, Pages 19217-19225Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c08836
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Funding
- Azrieli Foundation
- Israel Science Foundation (ISF)
- German Science Foundation (DFG)
- Benoziyo Endowment Fund for the Advancement of Science
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We observe reversible, bias-induced switching of conductance via a blue copper protein azurin mutant, N42C Az, with a nearly 10-fold increase at vertical bar V vertical bar > 0.8 V than at lower bias. No such switching is found for wild-type azurin, WT Az, up to vertical bar 1.2 V vertical bar, beyond which irreversible changes occur. The N42C Az mutant will, when positioned between electrodes in a solid-state Au-protein-Au junction, have an orientation opposite that of WT Az with respect to the electrodes. Current(s) via both proteins are temperature-independent, consistent with quantum mechanical tunneling as dominant transport mechanism. No noticeable difference is resolved between the two proteins in conductance and inelastic electron tunneling spectra at
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