Abstract
The transfer of electrons between proteins is an essential step in biological energy production. Two protein redox partners are often artificially crosslinked to investigate the poorly understood mechanism by which they interact. To better understand the effect of crosslinking on electron transfer rates, we have constructed dimers of azurin by crosslinking the monomers. The measured electron exchange rates, combined with crystal structures of the dimers, demonstrate that the length of the linker can have a dramatic effect on the structure of the dimer and the electron transfer rate. The presence of ordered water molecules in the protein–protein interface may considerably influence the electronic coupling between redox centers.
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Acknowledgements
We thank M.Ph. Verbeet and L.J.C. Jeuken for their help with the mutagenesis, C. Erkelens for his technical assistance during NMR measurements, A.D. Bain for his advice in using the MEX/MEXICO programs, C.C. Moser and P.L. Dutton for providing the ET Rates software and I.V. Kurnikov for his help in using the HARLEM program. This work is supported in part by grants of the EU, the National Research Council of Italy (to A.Mer., D.C. and G.R.) and the Deutsche Forschungsgemeinschaft (to O.E. and A.Mes.).
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van Amsterdam, I., Ubbink, M., Einsle, O. et al. Dramatic modulation of electron transfer in protein complexes by crosslinking. Nat Struct Mol Biol 9, 48–52 (2002). https://doi.org/10.1038/nsb736
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DOI: https://doi.org/10.1038/nsb736
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