کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
2015723 | 1541942 | 2014 | 8 صفحه PDF | دانلود رایگان |
• Plant mitochondrial induced H+ leak was studied under non-phosphorylating condition.
• GTP-sensitivity of retinal and HNE-induced H+ leak is controlled by Q redox state.
• GTP-sensitivity of linoleic acid-induced H+ leak is controlled by Q redox state.
• The H+ leak was inhibited by GTP only when Q was sufficiently oxidized.
Using isolated potato tuber mitochondria possessing uncoupling protein (StUCP), we found that, under non-phosphorylating conditions, the sensitivity of aldehyde (all trans-retinal or 4-hydroxy-2-nonenal)-induced and fatty acid (linoleic acid)-induced StUCP-mediated proton leaks to GTP is controlled by the endogenous ubiquinone (Q) reduction level. The action of StUCP activators was abolished by GTP only when Q was sufficiently oxidized, but no inhibitory effect was observed when Q was highly reduced. Thus, the Q reduction level-dependent regulation of StUCP inhibition functions independently of the type of UCP activation and could be an important physiological factor affecting the efficiency of UCP-catalyzed uncoupling in plant mitochondria.
Journal: Plant Physiology and Biochemistry - Volume 79, June 2014, Pages 109–116