Cited by 23Mitochondrial Function and PathologyCoenzyme Q10 studies and effectsBiochemical Acid Research Studies

Oxidation of malate by the mitochondrial succinate–ubiquinone reductase

Belikova, Yuliya O., Kotlyar, Alexander B., Vinogradov, Andrei D.·1988·Biochimica et Biophysica Acta (BBA) - Bioenergetics

Abstract

The purified succinate-ubiquinone reductase catalyzes the L- (or D-) malate: acceptor oxidoreductase reaction with Km for malate of about 2.10(-3) M and initial Vmax of 50 and 100 nmol per min per mg of protein for L- and D-stereoisomers, respectively (25 degrees C, pH 7.0). The reaction rate rapidly decreases both in the absence and presence of L-glutamate and L-glutamate-oxaloacetate transaminase added for trapping of oxaloacetate. Both keto and enol forms of oxaloacetate were found to be strong, slowly dissociating inhibitors of succinate dehydrogenase; the first-order rate constant for the enzyme inhibition by the enol form is about 3 times as high as that by the keto form. Oxidation of malate by succinate dehydrogenase in the presence of the oxaloacetate trapping system occurs at an indefinitely constant rate when enoloxaloacetate, which is an immediate product of the reaction, is rapidly converted into the keto isomer--a substrate for transaminase. A quantitative kinetic scheme for malate oxidation by succinate dehydrogenase which includes two kinetically distinct enzyme-oxaloacetate complexes is proposed, and the specific role of the mitochondrial oxaloacetate keto-enol-tautomerase (EC 5.3.2.2) in the regulation of succinate dehydrogenase is suggested.

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Crossref · 10.1016/0005-2728(88)90245-9

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Authors
Belikova, Y. O., Kotlyar, A. B., & Vinogradov, A. D.
Affiliations
Lomonosov Moscow State University (RU)
Corresponding author
Vinogradov, Andrei D.
Venue
Biochimica et Biophysica Acta (BBA) - Bioenergetics
Publisher
Elsevier BV
Published
1988-10
Volume
936
Issue
1
Pages
1-9
ISSN
0005-2728 (ISSN-L)
OpenAlex
W2022135739
Cited by
23
References
39
Citations by year
2024: 2 · 2023: 1 · 2021: 1 · 2020: 1 · 2017: 1 · 2013: 2 · 2012: 1
FWCI
0.53
Type
journal article
Language
en
Open access
closed
Locations
  • Biochimica et Biophysica Acta (BBA) - Bioenergetics (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Coenzyme Q10 studies and effects
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Biochemical Acid Research Studies
Keywords
malate oxidation, succinate-ubiquinone reductase, succinate dehydrogenase, oxaloacetate, keto-enol tautomerism, enzyme inhibition, glutamate, enzyme kinetics
MeSH terms
Animals, Aspartate Aminotransferases, Cattle, Chemistry, Glutamates, Isomerases, Kinetics, Malate Dehydrogenase, Malates, Mitochondria, Heart, Multienzyme Complexes, Oxaloacetates, Oxidation-Reduction, Oxidoreductases, Stereoisomerism, Succinate Dehydrogenase, Glutamic Acid, Intramolecular Oxidoreductases, Electron Transport Complex II, Chemical Phenomena

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