Abstract
Plant mitochondria contain four different NADH dehydrogenases, three of which are located on the inner membrane and feed electrons directly into the respiratory chain. One, a Ca 2+-dependent dehydrogenase, faces the intermembrane space and oxidizes exogenous NADH; the other two enzymes, which have markedly different affinities for NADH, face the matrix and oxidize endogenous NADH. The presence and properties of these dehydrogenases introduce a number of hitherto unknown means of regulating electron transport and mitochondrial-cytoplasmic interactions.
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