Isolated potato (Solanum tuberosum) tuber mitochondria purified by isopycnic centrifugation in density gradients of Percoll were found to be highly intact, to be devoid of extramitochondrial contaminations and to retain a high rate of O2 consumption. When suspended in a medium that avoided rupture of the outer membrane, intact purified mitochondria progressively lost their NAD+ content by passive diffusion. This led to a slow decrease of oxoglutarate-dependent O2 consumption by isolated mitochondria. Addition of NAD+ to the medium restored the initial State-3 rate of oxoglutarate oxidation. The rate of NAD+ accumulation in the matrix space was concentration-dependent, exhibited Michaelis-Menten kinetics and was strongly inhibited by the analogue N-4-azido-2-nitrophenyl-4-aminobutyryl-NAD+.
Research Article|November 15 1983
Slow passive diffusion of NAD+ between intact isolated plant mitochondria and suspending medium
Biochem J (1983) 216 (2): 443-450.
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M Neuburger, R Douce; Slow passive diffusion of NAD+ between intact isolated plant mitochondria and suspending medium. Biochem J 15 November 1983; 216 (2): 443–450. doi: https://doi.org/10.1042/bj2160443
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