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首页> 外文期刊>The Plant Journal >Dynamic and fluctuating generation of hydrogen peroxide via photorespiratory metabolic channeling in plants
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Dynamic and fluctuating generation of hydrogen peroxide via photorespiratory metabolic channeling in plants

机译：植物通过光呼吸代谢通道动态和波动地生成过氧化氢

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The homeostasis of hydrogen peroxide (H2O2), a key regulator of basic biological processes, is a result of the cooperation between its generation and scavenging. However, the mechanistic basis of this balance is not fully understood. We previously proposed that the interaction between glycolate oxidase (GLO) and catalase (CAT) may serve as a molecular switch that modulates H2O2 levels in plants. In this study, we demonstrate that the GLO-CAT complex in plants exists in different states, which are dynamically interchangeable in response to various stimuli, typically salicylic acid (SA), at the whole-plant level. More crucially, changes in the state of the complex were found to be closely linked to peroxisomal H2O2 fluctuations, which were independent of the membrane-associated NADPH oxidase. Furthermore, evidence suggested that H2O2 channeling occurred even in vitro when GLO and CAT worked cooperatively. These results demonstrate that dynamic changes in H2O2 levels are physically created via photorespiratory metabolic channeling in plants, and that such H2O2 fluctuations may serve as signals that are mechanistically involved in the known functions of photorespiratory H2O2. In addition, our study also revealed a new way for SA to communicate with H2O2 in plants.
机译：双氧水(过氧化氢)的体内平衡,一个密钥监管机构的基本生物过程,是一个其生成的结果之间的合作和清除。这种平衡不是完全理解。之前建议之间的交互乙醇酸氧化酶(如果)和过氧化氢酶(CAT)作为一个调节过氧化氢的分子开关在植物的水平。在植物中存在GLO-CAT复杂不同状态的动态可互换的不同刺激,通常水杨酸(SA),全植物的水平。复杂的是紧密相连过氧化物酶病过氧化氢波动,独立的膜相关NADPH氧化酶。过氧化氢将发生如果时甚至在体外猫和合作工作。表明过氧化氢水平的动态变化通过photorespiratory身体了吗在植物代谢通道,这样过氧化氢可以作为信号波动从力学上看参与已知的函数photorespiratory的过氧化氢。还揭示了SA沟通的新方式与过氧化氢在植物。

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