Potassium iodide-induced changes in pyruvate dehydrogenase complex from bacillus stearothermophilus

Yoichi Aso, Yasuaki Hiromasa, Yoshikatsu Aikawa, Kohji Meno, Masatsune Ishiguro

研究成果: Contribution to journalArticle査読

7 被引用数 (Scopus)


Treatment with KI and its subsequent removal induced disassembly of Bacillus stearothermophilus pyruvate dehydrogenase complex (PDC) and association of disassembly products, respectively. The disassembly yielded neither completely dissociated components nor aggregate, but did yield a few molecular forms smaller than PDC. Depending on the KI concentration, these changes were of three phases: K-1, below 0.6 M; K-2, 1.0-1.5 M; K-3, above 1.8 M. PDC was disassembled in K-1 to C1 comprising pyruvate decarboxylase and lipoate acetyltransferase mainly and C2 comprising the decarboxylase and dihydrolipoamide dehydrogenase. In K-1, the removal of KI resulted in an apparent reconstitution of PDC. The mixing of C1 with an excess of C2 yielded an assembly larger than PDC and restored enzyme activities, but specific activities were different from those of PDC. In K-2 and K-3 phases, complexes smaller than PDC were yielded from disassembly products, and activities except for that of the acetyltransferase were not restored.

ジャーナルBioscience, Biotechnology and Biochemistry
出版ステータス出版済み - 1998

All Science Journal Classification (ASJC) codes

  • バイオテクノロジー
  • 分析化学
  • 生化学
  • 応用微生物学とバイオテクノロジー
  • 分子生物学
  • 有機化学


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