Catalytic properties of Escherichia coli F1-ATPase depleted of endogenous nucleotides.

Nucleotide-depleted Escherichia coli F1 was prepared by the procedure of Wise et al. (1983, Biochem. J. 215, 343-350). This enzyme had high rates of steady-state ATPase and GTPase activity. When "unisite" ATP hydrolysis was measured using an F1/ATP concentration ratio of 10, all of the substoichiometric ATP became bound to the high-affinity catalytic site and none became bound to noncatalytic sites. The association rate constant for ATP binding was 7 x 10(5) M-1 s-1 and the KdATP was 7.9 x 10(-10) M, as compared to values of 3.8 x 10(5) M-1 s-1 and 1.9 x 10(-10) M, respectively, in native (i.e., nucleotide-replete) F1. Rate constants for bound ATP hydrolysis, ATP resynthesis, and P(i) release, and the reaction equilibrium constant, were similar in nucleotide-depleted and native F1. Therefore, we conclude that occupancy of the noncatalytic sites is not required for formation of the high-affinity catalytic site of F1 and has no significant effect on unisite catalysis. In further experiments we looked for the occurrence of inhibitory, catalytic-site-bound MgADP in E. coli F1. Such an entity has been reported for chloroplast and mitochondrial F1. However, our experiments gave no indication for inhibitory MgADP in E. coli F1.

• Publication year

  1992

• Venue

  Archives of Biochemistry and Biophysics

• Publication date

  1992-09-01

• Fields of study

  Biology, Medicine, Chemistry

• Identifiers
  DOI 10.1016/0003-9861(92)90682-MPMID 1386723
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar, PubMed

• No claims are published for this paper.

• No concepts are published for this paper.

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