Potato tuber mitochondria oxidizing malate respond to NAD + addition with increased oxidation rates, whereas mung bean hypocotyl mitochondria do not. This is traced to a low endogenous content of NAD + in potato mitochondria, which prove to take up added NAD + . This mechanism concentrates NAD + in the matrix space. Analyses for oxaloacetate and pyruvate (with pyruvate dehydrogenase blocked) are consistent with regulation of malate oxidation by the internal NAD + /NADH ratio.
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