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• W1580223847 abstract "The catalytic site of Escherichia coli F1 was probed using a reactive ATP analogue, adenosine triphosphopyridoxal (AP3-PL). For complete loss of enzyme activity, about 1 mol of AP3-PL bound to 1 mol of F1 was estimated to be required in the presence or absence of Mg2+. About 70% of the label was bound to the alpha subunit and the rest to the beta subunit in the absence of Mg2+, and the alpha Lys-201 and beta Lys-155 residues, respectively, were the major target residues (Tagaya, M., Noumi, T., Nakano, K., Futai, M., and Fukui, T. (1988) FEBS Lett. 233, 347-351). Addition of Mg2+ decreased the AP3-PL concentration required for half-maximal inhibition, and predominant labeling of the beta subunit (beta Lys-155 and beta Lys-201) with the reagent. ATP and ADP were protective ligands in the presence and absence of Mg2+. The alpha subunit mutation (alpha Lys-201—-Gln or alpha Lys-201 deletion) were active in oxidative phosphorylation. However, purified mutant F1s showed impaired low multi-site activity, although their uni-site catalyses were essentially normal. Thus alpha Lys-201 is not a catalytic residue, but may be important for catalytic cooperativity. Mutant F1s were inhibited less by AP3-PL in the absence of Mg2+, and consistent with this, modifications of their alpha subunits by AP3-PL were reduced. AP3-PL was more inhibitory to the mutant enzymes in the presence of Mg2+, and bound to the beta Lys-155 and beta Lys-201 residues of mutant F1 (alpha Lys-201—-Gln). These results strongly suggest that alpha Lys-201, beta Lys-155, and beta Lys-201 are located close together near the gamma-phosphate group of ATP bound to the catalytic site, and that the two beta residues and the gamma-phosphate group become closer to each other in the presence of Mg2+." @default.
• W1580223847 created "2016-06-24" @default.
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• W1580223847 date "1991-03-01" @default.
• W1580223847 modified "2023-09-27" @default.
• W1580223847 title "Catalytic site of F1-ATPase of Escherichia coli. Lys-155 and Lys-201 of the beta subunit are located near the gamma-phosphate group of ATP in the presence of Mg2+." @default.
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• W1580223847 doi "https://doi.org/10.1016/s0021-9258(19)67612-x" @default.
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