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• W2140673804 abstract "This paper describes the role of alpha-subunit VISIT-DG sequence residues alphaSer-347 and alphaGly-351 in catalytic sites of Escherichia coli F(1)F(o) ATP synthase. X-ray structures show the very highly conserved alpha-subunit VISIT-DG sequence in close proximity to the conserved phosphate-binding residues alphaArg-376, betaArg-182, betaLys-155, and betaArg-246 in the phosphate-binding subdomain. Mutations alphaS347Q and alphaG351Q caused loss of oxidative phosphorylation and reduced ATPase activity of F(1)F(o) in membranes by 100- and 150-fold, respectively, whereas alphaS347A mutation showed only a 13-fold loss of activity and also retained some oxidative phosphorylation activity. The ATPase of alphaS347Q mutant was not inhibited, and the alphaS347A mutant was slightly inhibited by MgADP-azide, MgADP-fluoroaluminate, or MgADP-fluoroscandium, in contrast to wild type and alphaG351Q mutant. Whereas 7-chloro-4-nitrobenzo-2-oxa-1, 3-diazole (NBD-Cl) inhibited wild type and alphaG351Q mutant ATPase essentially completely, ATPase in alphaS347A or alphaS347Q mutant was inhibited maximally by approximately 80-90%, although reaction still occurred at residue betaTyr-297, proximal to the alpha-subunit VISIT-DG sequence, near the phosphate-binding pocket. Inhibition characteristics supported the conclusion that NBD-Cl reacts inbetaE (empty) catalytic sites, as shown previously by x-ray structure analysis. Phosphate protected against NBD-Cl inhibition in wild type and alphaG351Q mutant but not in alphaS347Q or alphaS347A mutant. The results demonstrate that alphaSer-347 is an additional residue involved in phosphate-binding and transition state stabilization in ATP synthase catalytic sites. In contrast, alphaGly-351, although strongly conserved and clearly important for function, appears not to play a direct role." @default.
• W2140673804 created "2016-06-24" @default.
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• W2140673804 date "2009-04-01" @default.
• W2140673804 modified "2023-09-26" @default.
• W2140673804 title "Role of α-Subunit VISIT-DG Sequence Residues Ser-347 and Gly-351 in the Catalytic Sites of Escherichia coli ATP Synthase" @default.
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• W2140673804 doi "https://doi.org/10.1074/jbc.m809209200" @default.
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