Kinetics and mechanism of acetate kinase from bacillus stearothermophilus

Haruo Ishikawa, Masahiro Shiroshima, Arief Widjaja, Hiroshi Nakajima, Ryoichi Tsurutani

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13 Citations (Scopus)

Abstract

The initial rates of ATP regeneration catalyzed by acetate kinase (ATP: acetate phosphotransferase; EC 2.7.2.1) from Bacillus stearothermophilus were measured under a wide range of MgADP, acetyl phosphate, MgATP2’ and acetate concentrations. The experimental results showed that the enzyme exhibited positive co-operativity for MgATP2’ and no co-operativity for MgADP-, acetyl phosphate and acetate. Furthermore, the initial rates of the forward reaction, in which MgATP2’ and acetate were produced from MgADP’ and acetyl phosphate, were inhibited by MgATP2’ and acetate, and those of the reverse reaction were inhibited by MgADP’ and acetyl phosphate. The initial rate data were correlated well by using the rate equation derived based on the assumption that the reaction obeys the general reaction scheme based on the Random Bi Bi mechanism, and on the previous experimental result that the enzyme behaves like a dimeric enzyme, even though it is a tetrameric enzyme.

Original languageEnglish
Pages (from-to)517-524
Number of pages8
JournalJournal of Chemical Engineering of Japan
Volume28
Issue number5
DOIs
Publication statusPublished - 1995
Externally publishedYes

Keywords

  • ATP Regeneration
  • Allosteric Enzyme
  • Biochemical Engineering
  • Random Bi Bi
  • Reaction Rate

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