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Investigation of the aurovertin binding site of Escherichia coli F1-ATPase by fluorescence spectroscopy and site-directed mutagenesis

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Grell,  Ernst
Molecular Biophysics Group, Max Planck Institute of Biophysics, Max Planck Society;

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Citation

Weber, J., Lee, R. S., Grell, E., & Senior, A. E. (1992). Investigation of the aurovertin binding site of Escherichia coli F1-ATPase by fluorescence spectroscopy and site-directed mutagenesis. Biochemistry, 31(22), 5112-5116. doi:10.1021/bi00137a004.


Cite as: http://hdl.handle.net/21.11116/0000-0008-00C9-5
Abstract
(1) Previous mutational analyses have shown that residue beta R398 of the beta-subunit is a key residue for binding of the inhibitory antibiotic aurovertin to Escherichia coli F1Fo-ATP synthase. Here, we studied purified F1 from the beta R398C and beta R398W mutants. ATPase activity in both cases was resistant to aurovertin inhibition. The fluorescence spectrum (lambda exc = 278 or 295 nm) of beta R398W F1 showed a significant red-shift as compared to wild-type and beta R398C enzymes, indicating that residue beta R398 lies in a polar environment. On the basis of this and previous evidence, we propose that aurovertin binding to F1-ATPase involves a specific charged donor-acceptor H-bond between residue beta R398 and the 7-hydroxyl group of aurovertin. (2) The fluorescent substrate analog lin-benzo-ADP was shown to bind to beta R398W F1 catalytic sites with the same Kd values as to wild-type F1, and with the same quenching of the fluorescence of the analog. Fluorescence energy transfer was seen between the beta R398W residue and bound lin-benzo-ADP. Analysis of transfer efficiency at varying stoichiometry of bound lin-benzo-ADP showed that interaction occurred between one beta R398W residue and one catalytic-site-bound analog molecule at a distance of approximately 23 A. The relationships of the aurovertin and catalytic sites in the primary and tertiary structure are discussed.