Kinetic of superoxide formation by respiratory chain NADH-dehydrogenase of bovine heart mitochondria

Dongchon Kang, Hideki Narabayashi, Takeyoshi Sata, Koichiro Takeshige

Research output: Contribution to journalArticle

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Abstract

Formation of superoxide anions (O2-) by bovine heart NADH-dehydrogenase preparation (Complex I) supported by an NADH- or NADPH-generating system was studied kinetically. Both NADH- and NADPH-dependent superoxide-forming activities of Complex I were biphasic in double reciprocal plots. The NADHdependent reaction had two sets of kinetic parameters: One Km value for NADH was 10 times higher than the other one, and the Vmax of the reaction with high Km was about 4 times higher than that of the reaction with low Km. Similar Vmax values were obtained for the NADPH-dependent reactions but the Km values were a thousand times higher than those of the NADH-dependent reactions. The plots of the NADH-dependent activity of rotenone-treated submitochondrial particles were also biphasic. The double reciprocal plots of NADH- and NADPH-dependent 2,6-dichlorophenolindophenol (DCIP) reductase activities of Complex I were linear and the plots of the superoxide-forming activities against the DCIP reductase activities were biphasic. These results indicate that the biphasic double reciprocal plots of the superoxide-forming activities against reduced coenzymes are not caused by interaction between reduced coenzymes and the NADH-dehydrogenase but are due to the presence of at least two superoxide-forming sites in the respiratory chain NADH-dehydrogenase.

Original languageEnglish
Pages (from-to)1301-1306
Number of pages6
JournalJournal of biochemistry
Volume94
Issue number4
DOIs
Publication statusPublished - Jan 1 1983

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NADH Dehydrogenase
Heart Mitochondria
Mitochondria
Electron Transport
Superoxides
NAD
NADP
Kinetics
Coenzymes
Submitochondrial Particles
Rotenone
Kinetic parameters

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology

Cite this

Kinetic of superoxide formation by respiratory chain NADH-dehydrogenase of bovine heart mitochondria. / Kang, Dongchon; Narabayashi, Hideki; Sata, Takeyoshi; Takeshige, Koichiro.

In: Journal of biochemistry, Vol. 94, No. 4, 01.01.1983, p. 1301-1306.

Research output: Contribution to journalArticle

Kang, Dongchon ; Narabayashi, Hideki ; Sata, Takeyoshi ; Takeshige, Koichiro. / Kinetic of superoxide formation by respiratory chain NADH-dehydrogenase of bovine heart mitochondria. In: Journal of biochemistry. 1983 ; Vol. 94, No. 4. pp. 1301-1306.
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