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Ubiquinone-1 induces external deamino-NADH oxidation in potato tuber mitochondria

  • Ian M. Møller
  • Thomas H. Roberts
  • Allan G. Rasmusson
Publishing year: 1996-09
Language: English
Pages: 75-78
Publication/Series: Plant Physiology
Volume: 112
Issue: 1
Document type: Journal article
Publisher: American Society of Plant Biologists

Abstract english

The addition of ubiquinone-1 (UQ-1) induced Ca2+-independent oxidation of deamino-NADH and NADH by intact potato (Solanum tuberosum L. cv Bintje) tuber mitochondria. The induced oxidation was coupled to the generation of a membrane potential. Measurements of NAD+-malate dehydrogenase activity indicated that the permeability of the inner mitochondrial membrane to NADH and deamino-NADH was not altered by the addition of UQ-1. We conclude that UQ-1-induced external deamino-NADH oxidation is due to a change in specificity of the external rotenone-insensitive NADH dehydrogenase. The addition of UQ-1 also induced rotenone-insensitive oxidation of deamino-NADH by inside-out submitochondrial particles, but whether this was due to a change in the specificity of the internal rotenone-insensitive NAD(P)H dehydrogenase or to a bypass in complex I could not be determined.


  • Biochemistry and Molecular Biology


  • ISSN: 0032-0889
Allan Rasmusson
E-mail: allan [dot] rasmusson [at] biol [dot] lu [dot] se


Molecular Cell Biology

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