Regulation of the activity of branched-chain 2-oxo acid dehydrogenase (BCODH) complex by binding BCODH kinase

Mariko Obayashi, Yuzo Sato, Robert Harris, Yoshiharu Shimomura

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Branched-chain 2-oxo acid dehydrogenase (BCODH) kinase is responsible for inactivation of BCODH complex by phosphorylation of the complex. Activity of the kinase towards its substrate, the E1 component of the BCODH complex, is known dependent upon binding of the kinase to the E2 component. The possible existence as well as importance of unbound mitochondrial BCODH kinase has been largely ignored in previous studies. Evidence is presented here for the existence of free and bound BCODH kinase in the matrix space of rat liver mitochondria. Furthermore, in female rats, in which diurnal variations in liver BCODH complex and kinase activities occur, the amount of the kinase bound to the complex changes between morning and evening without a change in total kinase protein. Activity of the kinase correlates with the amount of bound rather than total kinase protein, suggesting only the bound form is active. Changes in amount of kinase bound and therefore active appear responsible for diurnal variation in BCODH complex activity in the female rat. We propose that change in the amount of bound BCODH kinase is a key feature of a novel regulatory mechanism for determining the activity state of the BCODH complex.

Original languageEnglish
Pages (from-to)50-54
Number of pages5
JournalFEBS Letters
Volume491
Issue number1-2
DOIs
StatePublished - Feb 23 2001

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3-Methyl-2-Oxobutanoate Dehydrogenase (Lipoamide)
Phosphotransferases
Rats
Liver
Protein Kinases
Phosphorylation
Mitochondria
Liver Mitochondrion

Keywords

  • Bound form
  • Branched-chain 2-oxo acid dehydrogenase complex
  • Branched-chain 2-oxo acid dehydrogenase kinase
  • Free form
  • Rat liver mitochondrion

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

Cite this

Regulation of the activity of branched-chain 2-oxo acid dehydrogenase (BCODH) complex by binding BCODH kinase. / Obayashi, Mariko; Sato, Yuzo; Harris, Robert; Shimomura, Yoshiharu.

In: FEBS Letters, Vol. 491, No. 1-2, 23.02.2001, p. 50-54.

Research output: Contribution to journalArticle

Obayashi, Mariko ; Sato, Yuzo ; Harris, Robert ; Shimomura, Yoshiharu. / Regulation of the activity of branched-chain 2-oxo acid dehydrogenase (BCODH) complex by binding BCODH kinase. In: FEBS Letters. 2001 ; Vol. 491, No. 1-2. pp. 50-54.
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