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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Mitochondrial uncoupling protein is required for efficient photosynthesis
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Mitochondrial uncoupling protein is required for efficient photosynthesis

机译：线粒体解偶联蛋白是有效光合作用所必需的

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Uncoupling proteins (UCPs) occur in the inner mitochondrial membrane and dissipate the proton gradient across this membrane that is normally used for ATIP synthesis. Although the catalytic function and regulation of plant UCPs have been described, the physiological purpose of UCP in plants has not been established. Here, biochemical and physiological analyses of an insertional knockout of one of the Arabidoposis UCP genes (AtUCP1) are presented that resolve this issue. Absence of UCP1 results in localized oxidative stress but does not impair the ability of the plant to withstand a wide range of abiotic stresses. However, absence of UCP1 results in a photosynthetic phenotype. Specifically there is a restriction in photorespiration with a decrease in the rate of oxidation of photorespiratory glycine in the mitochondrion. This change leads to an associated reduced photosynthetic carbon assimilation rate. Collectively, these results suggest that the main physiological role of UCP1 in Arabidopsis leaves is related to maintaining the redox poise of the mitochondrial electron transport chain to facilitate photosynthetic metabolism.
机译：解偶联蛋白（UCP）发生在线粒体内膜中，并消散了通常用于ATIP合成的跨膜的质子梯度。尽管已经描述了植物UCP的催化功能和调节，但是尚未确定UCP在植物中的生理目的。在这里，提出了解决这个问题的拟南芥UCP基因之一（AtUCP1）的插入敲除的生化和生理分析。没有UCP1会导致局部氧化胁迫，但不会损害植物承受各种非生物胁迫的能力。但是，不存在UCP1会导致光合作用表型。具体而言，光呼吸受到限制，线粒体中光呼吸甘氨酸的氧化速率降低。这种变化导致光合碳同化率降低。总的来说，这些结果表明UCP1在拟南芥叶片中的主要生理作用与维持线粒体电子运输链的氧化还原平衡以促进光合代谢有关。

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