alpha3beta3gamma complex of F1-ATPase from thermophilic Bacillus PS3 can maintain steady-state ATP hydrolysis activity depending on the number of non-catalytic sites

Biochem J. 1999 Oct 1;343 Pt 1(Pt 1):135-8.

Abstract

Homogeneous preparations of alpha(3)beta(3)gamma complexes with one, two or three non-competent non-catalytic site(s) were performed as described [Amano, Hisabori, Muneyuki, and Yoshida (1996) J. Biol. Chem. 271, 18128-18133] and their properties were compared with those of the wild-type complex. The ATPase activity of the complex with three non-competent non-catalytic sites decayed rapidly to an inactivated state, as reported previously [Matsui, Muneyuki, Honda, Allison, Dou, and Yoshida (1997) J. Biol. Chem. 272, 8215-8221]. In contrast, the complex with one or two non-competent non-catalytic sites displayed a substantial steady-state phase activity depending on the number of non-competent non-catalytic sites in the complex. This result indicates that one competent non-catalytic site can maintain the continuous catalytic turnover of the enzyme and can potentially relieve all three catalytic sites from inhibition by MgADP(-). Furthermore, the results suggest that the interaction between three non-catalytic sites might not be as strong as that between catalytic sites, which are all strictly required for a continuous catalytic turnover.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adenosine Triphosphate / metabolism*
  • Bacillus / enzymology*
  • Base Sequence
  • Catalytic Domain
  • DNA Primers
  • Dimethylamines / pharmacology
  • Enzyme Activators / pharmacology
  • Hydrolysis
  • Mutagenesis, Site-Directed
  • Proton-Translocating ATPases / genetics
  • Proton-Translocating ATPases / metabolism*

Substances

  • DNA Primers
  • Dimethylamines
  • Enzyme Activators
  • dodecyldimethylamine oxide
  • Adenosine Triphosphate
  • Proton-Translocating ATPases