The alpha3beta3gamma subcomplex of the F1-ATPase from the thermophilic bacillus PS3 with the betaT165S substitution does not entrap inhibitory MgADP in a catalytic site during turnover.
The hydrolytic properties of the mutant alpha3(betaT165S)3gamma and wild-type alpha3beta3gamma subcomplexes of TF1 have been compared. Whereas the wild-type complex hydrolyzes 50 microM ATP in three kinetic phases, the mutant complex hydrolyzes 50 microM ATP with a linear rate. After incubation with a slight excess of ADP in the presence of Mg2+, the wild-type complex hydrolyzes 2 mM ATP with a long lag. In contrast, prior incubation of the mutant complex under these conditions does not affect the kinetics of ATP hydrolysis. The ATPase activity of the wild-type complex is stimulated 4-fold by 0. 1% lauryl dimethylamine oxide, whereas this concentration of lauryl dimethylamine oxide inhibits the mutant complex by 25%. Compared with the wild-type complex, the activity of the mutant complex is much less sensitive to turnover-dependent inhibition by azide. This comparison suggests that the mutant complex does not entrap substantial inhibitory MgADP in a catalytic site during turnover, which is supported by the following observations. ATP hydrolysis catalyzed by the wild-type complex is progressively inhibited by increasing concentrations of Mg2+ in the assay medium, whereas the mutant complex is insensitive to increasing concentrations of Mg2+. A Lineweaver-Burk plot constructed from rates of hydrolysis of 20-2000 microM ATP by the wild-type complex is biphasic, exhibiting apparent Km values of 30 microM and 470 microM with corresponding kcat values of 26 and 77 s-1. In contrast, a Lineweaver-Burk plot for the mutant complex is linear in this range of ATP concentration, displaying a Km of 133 microM and a kcat of 360 s-1.
Department of Chemistry and Biochemistry, School of Medicine, University of California at San Diego, La Jolla, California 92093-0601, USA. wallison@ucsd.edu
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Jault
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Dou
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Grodsky
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Matsui
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Yoshida
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Allison
D000244:Adenosine Diphosphate / Q000378:metabolism* / Q000494:pharmacology; D000255:Adenosine Triphosphate / Q000378:metabolism; D001407:Bacillus / Q000201:enzymology*; D002384:Catalysis; D006868:Hydrolysis; D006180:Proton-Translocating ATPases / Q000037:antagonists & inhibitors / Q000378:metabolism*
D000244:Adenosine Diphosphate; D000255:Adenosine Triphosphate; D006180:Proton-Translocating ATPases