Cold-shock 310-kD protein uncouples oxidative phosphorylation in plantmitochondria

摘要

We studied the effects of cold-shock 310-kD protein (CSP310) isolated from winter rye seedlings on the energetic activity of plant mitochondria. CSP310 was shown to enhance nonphosphorylating respiration and uncoupled oxidative phosphorylation in isolated mitochondria. The uncoupling effect was enhanced with increasing protein concentration. An antibody against CSP310 interfered with the uncoupling effect of CSP310. Free fatty acids were not evidently involved in uncoupling. The physiological role of uncoupling between oxidation and phosphorylation during plant adaptation to low temperatures is discussed.