1. Dibutylchloromethyltin chloride, a potent inhibitor of electron transport in plant mitochondria.
- Author
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Moore AL, Linnett PE, and Beechey RB
- Subjects
- Oxygen Consumption drug effects, Plants metabolism, Electron Transport drug effects, Mitochondria drug effects, Organotin Compounds pharmacology, Plants drug effects, Trialkyltin Compounds
- Abstract
Dibutylchloromethyl tin chloride (DBCT) inhibits coupled and uncoupled respiration of mitochondria from potato tubers, cauliflower florets and etiolated mung bean hypocotyls with succinate and L-malate but not with external NADH or TMPD/ascorbate as substrates. Using potato and cauliflower mitochondria. DBCT at 200 pmole/mg of protein gives complete inhibition only in KCl-based media and at pH 6.8. DBCT has no effect on the internal pH of mung bean mitochondria, but does cause a decrease in the membrane potential. Electron transport through the alternative oxidase is not inhibited, neither is the ATP-synthase system. DBCT appears to interact with the functionally-distinct pool of ubiquinone associated with the oxidation of succinate and L-malate.
- Published
- 1980
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