Proteins tune the reactivity of metal sites; less understood is the impact of association with a redox partner. We demonstrate the utility of carbon–deuterium labels for selective analysis of delicate metal sites. Introduced into plastocyanin, they reveal substantial strengthening of the key Cu-Cys89 bond upon association with cytochrome f.
C. C. Mammoser, R. E. Agh, N. M. Garcia, Y. Wang and M. C. Thielges, Phys. Chem. Chem. Phys., 2022, 24, 21588 DOI: 10.1039/D2CP03314C
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