PMID: 44218Dec 1, 1979

Oxidation of reduced nicotinamide adenine dinucleotide phosphate by plant mitochondria

Canadian Journal of Biochemistry
G P Arron, G E Edwards

Abstract

Mitochondria isolated from various plant tissues (leaves, etiolated shoots and hypocotyls, and stem tubers) oxidize exogenous NADPH with respiratory control values and ADP:O ratios similar to those obtained with exogenous NADH as substrate. In all the mitochondria investigated, the electron-transfer inhibitors rotenone and amytal each had the same effect on the oxidation of NADPH as they had on the oxidation of NADH. The oxidation of exogenous NADPH by white potato tuber mitochondria was much more sensitive to inhibition by citrate or ethylene glycol bis-(beta-aminoethyl ether)-N,N-tetraacetic acid than was the oxidation of NADH. Mitochondria isolated from aged beetroot slices showed an increased capacity for the oxidation of exogenous NADH (compared with mitochondria from fresh tissue) but no such increase in the capacity to oxidize exogenous NADPH. These results suggest that exogenous NADPH and NADH are oxidized via different flavoproteins in plant mitochondria.

References

Aug 1, 1993·Journal of Bioenergetics and Biomembranes·I M MøllerK M Fredlund
Aug 1, 1981·Plant Physiology·D A Day, J T Wiskich
Feb 24, 2005·Annual Review of Plant Biology·Allan G RasmussonThomas E Elthon
May 5, 2001·Annual Review of Plant Physiology and Plant Molecular Biology·Ian M Moller
Aug 23, 1991·Biochimica Et Biophysica Acta·A L Moore, J N Siedow

Related Concepts

Ethylene Glycol Measurement
Calcium
Rotenone
Ethers
Tuber Subdivision of Bone
Etherum, ether, Homeopathic preparation
Citrate Measurement
NADH
Flavoproteins
Oxidation

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