作者: G.M. Weinstock , K. McEntee , I.R. Lehman
DOI: 10.1016/S0021-9258(19)68922-2
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摘要: The DNA-dependent ATPase activity of the recA protein Escherichia coli shows a complex dependence on ATP concentration. With single-stranded (SS) DNA cofactor, Hill coefficient for is 3.3 at pH 8.1 and 1.4 6.2. double-stranded (DS) 6.2 (no reaction detectable 8.1). In presence SS DNA, Km 20 microM, independent pH, while with DS 6.2, KmATP 100 microM. These other observations indicate that interaction influenced by both cofactor. ADP, UTP, dTTP, GTP are competitive inhibitors protein, indicating there single binding site nucleoside triphosphates. Nucleoside triphosphates, but not reduce hydrolysis thus can contribute to cooperative effect ATP.