Long-Range Electron Transfer in Engineered Azurins Exhibits Marcus Inverted Region Behavior.
The Marcus theory of electron transfer (ET) predicts that while the ET rate constants increase with rising driving force until it equals a reaction's reorganization energy, at higher driving force the ET rate decreases, having reached the Marcus inverted region. While experimental evidence of the inverted region has been reported for organic and inorganic ET reactions as well as for proteins conjugated with ancillary redox moieties, evidence of the inverted region in a "protein-only" system has remained elusive. We herein provide such evidence in a series of nonderivatized proteins. These results may facilitate the design of ET centers for future applications such as advanced energy conversions.
†Department of Analytical and Bioinorganic Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen 2100, Denmark.
Ole
O
Farver
Parisa
P
Hosseinzadeh
Nicholas M
NM
Marshall
∥Department of Chemistry, Washington State University, PO Box 644630, Pullman, Washington 99164, United States.
Scot
S
Wherland
Yi
Y
Lu
§Department of Immunology, Weizmann Institute of Science, Wolfson Building, Rehovot 76100, Israel.
Israel
I
Pecht
D001400:Azurin / Q000737:chemistry*; D004583:Electrons; D007700:Kinetics
D001400:Azurin
Marcus theory; blue copper; electron transfer; protein engineering; reorganization energy