Catalytic sites ofEscherichia coli F1-ATPase |
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Authors: | Alan E Senior |
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Institution: | (1) Department of Biochemistry, University of Rochester Medical Center, 14642 Rochester, New York |
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Abstract: | The catalytic site ofEscherichia coli F1-ATPase is reviewed in terms of structure and function. Structural prediction, biochemical analyses, and mutagenesis experiments suggest that the catalytic site is formed primarily by residues 137–335 of -subunit. Subdomains of the site involved in phosphate-bond cleavage/synthesis and adenine-ring binding are discussed. Ambiguities inherent in steady-state catalytic measurements due to catalytic site cooperativity are discussed, and the advantages of pre-steady-state ( unisite ) techniques are emphasized. The emergence of a single high-affinity catalytic site occurs as a result of F1-oligomer assembly. Measurements of unisite catalysis rate and equilibrium constants, and their modulation by varied pH, dimethylsulfoxide, and mutations, are described and conclusions regarding the nature of the high-affinity catalytic site and mechanism of catalysis are presented. |
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