Using three-day-old winter-wheat (Triticum aestivum L.) and six-day-old pea (Pisum sativum L.) seedlings as examples, we studied the effects of inhibitors of the electron transfer chain of plant mitochondria on the uncoupling between oxidation and phosphorylation brought about by the CSP310 stress protein. This uncoupling was inhibited by cyanide and by antibodies against CSP310, but not inhibited by antimycin A. It was shown that, in plant mitochondria, the CSP310 stress protein is involved in the electron transfer via shunting the major cytochrome pathway. In this case, the electron transfer bypasses complex II, ubiquinone, and complex III of the mitochondrial respiratory chain and is realized in the following succession: complex I-CSP310-cytochrome c-complex IV. This electron-transfer pathway was found in winter grass mitochondria during the low-temperature stress and resulted in thermogenesis. It was concluded that CSP310 is a thermogenic system, which is activated in winter grass mitochondria during the low-temperature stress.
Russian Journal of Plant Physiology – Springer Journals
Published: May 15, 2006
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