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The Δ N10aha2 PM H+-ATPase is activated biochemically. A, ATP dependence of ATP hydrolytic activity by wild-type PM H+-ATPase and the ΔN10aha2 PM H+-ATPase mutant at pH 7.0. B, pH dependence of ATP hydrolysis by wild-type PM H+-ATPase and the ΔN10aha2 PM H+-ATPase mutant. Purified plasma membrane-enriched fractions were analyzed in both A and B. □, wild-type AHA2; ■, ΔN10aha2. All experiments are represented as ± S.D.
