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Volume 271, Number 38, Issue of September 20, 1996 pp. 23117-23120
©1996 by The American Society for Biochemistry and Molecular Biology, Inc.

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Purification and Characterization of a 43-kDa Rotenone-insensitive NADH Dehydrogenase from Plant Mitochondria

(Received for publication, May 8, 1996, and in revised form, June 14, 1996)

From the Division of Biochemistry and Molecular Biology and the Co-operative Research Centre for Plant Science, The Australian National University, Canberra, ACT 0200, Australia

A 43-kDa NAD(P)H dehydrogenase was purified from red beetroot mitochondria. An antibody against this dehydrogenase was used in conjunction with the membrane-impermeable protein cross-linker 3,3-dithiobis(sulfosuccinimidylpropionate) to localize the dehydrogenase on the matrix side of the inner membrane. Immunoblotting showed that the dehydrogenase was found in mitochondria isolated from several plant species but not from rat livers. Antibodies against the purified dehydrogenase partially inhibited rotenoneinsensitive internal NADH oxidation by inside-out submitochondrial particles. The level of rotenone-insensitive respiration with NAD-linked substrates correlated with the amount of 43-kDa NAD(P)H dehydrogenase present in mitochondria isolated from different soybean tissues. Based on these results, we conclude that the 43-kDa NAD(P)H dehydrogenase is responsible for rotenone-insensitive internal NADH oxidation in plant mitochondria.

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