多聚半乳糖醛酸介导的超氧阴离子产生的潜在生理学意义。
The potential physiological implications of polygalacturonic acid-mediated production of superoxide.
机构信息
Institute for Multidisciplinary Research, University of Belgrade, Belgrade, Serbia.
出版信息
Plant Signal Behav. 2010 Dec;5(12):1525-9. doi: 10.4161/psb.5.12.12838. Epub 2010 Dec 1.
Abstract
PGA/OGA/PF represent apoplastic signaling molecules implicated in the control of gene expression and the activity of enzymes involved in defense regulation. However, the underlying mechanisms behind such processes are lacking. Here we unequivocally show using EPR spectroscopy with DEPMPO spin-trap capable of differentiating between •OH and •O(2)(-) that PGA and PF can produce •O(2)(-) by transforming •OH. The potential physiological implications of this unique property are discussed. We propose that PGA/OGA/PF could represent the initiators of redox signaling cascades in stress response, with H(2)O(2) being a downstream secondary messenger.
摘要
PGA/OGA/PF 代表质外体信号分子，涉及基因表达的控制和防御调节中酶活性。然而，这些过程背后的潜在机制尚不清楚。在这里，我们使用 DEPMPO 自旋陷阱的 EPR 光谱技术明确地表明，PGA 和 PF 可以通过转化 •OH 产生 •O(2)(-)。讨论了这种独特性质的潜在生理意义。我们提出 PGA/OGA/PF 可能代表应激反应中氧化还原信号级联的启动子，H(2)O(2)是下游的二级信使。
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