蛋白激酶组在玉米叶片ABA和H2O2诱导抗氧化防护中的作用

doi:10.3724/SP.J.1143.2011.10197

摘要/Abstract

摘要：

蛋白磷酸化在植物细胞脱落酸（ABA）介导的信号转导中起重要作用。然而，很多参与ABA信号途径的蛋白元件仍不清楚。使用改进的体外激酶试验方法的研究结果表明，在玉米叶片中，ABA和H2O2能够快速活化蛋白激酶总活性和Ca2+依赖型蛋白激酶总活性；ABA诱导的蛋白激酶总活性增加可以被活性氧的抑制剂和清除剂抑制，蛋白激酶抑制剂不仅可以降低ABA和H2O2诱导的激酶活性增加，而且也可以弱化它们对抗氧化防护酶活性的诱导作用；ABA和H2O2引发的蛋白磷酸化作用显著居先于它们诱导的抗氧化防护作用。使用凝胶激酶试验方法进行研究发现，一组分子量分别为66kDa, 52kDa, 49kDa和35kDa的蛋白激酶可能介导了ABA和H2O2诱导的抗氧化防护反应，并且66kDa和49kDa的蛋白激酶可能在ROS的下游起作用, 而52kDa和35kDa的蛋白激酶可能在ABA和ROS的下游起作用。

关键词: ABA, 蛋白激酶, 磷酸化作用, 活性氧, 抗氧化防护

Abstract:

Protein phosphorylation plays a central role in mediating abscisic acid (ABA) signaling transduction in plant cells, whereas many of the sensory proteins involving in ABA signaling pathway remain unclear. Here, using a modified in vitro kinase assay, our results showed that ABA and H2O2 induced a rapid activation of total protein kinases and calcium dependent protein kinases in the leaves of maize seedlings. However, ABA-induced activation of protein kinases was inhibited by reactive oxygen species (ROS) inhibitors or scavengers. Protein kinase inhibitors decelerated not only the ABA and H2O2 -induced kinase activity but also ABA or H2O2-induced antioxidant enzyme activity. Protein phosphorylation caused by ABA and H2O2 preceded ABA or H2O2 -induced antioxidant defense obviously. Using in-gel kinase assays, our results showed that several protein kinases with molecular masses of 66kDa, 52kDa, 49kDa and 35kDa respectively might mediate ABA and H2O2-induced antioxidant defense. And the 66kDa and 49kDa protein kinases may act downstream of ROS, and the 52kDa and 35kDa protein kinases may act between ABA and ROS in ABA-induced antioxidant defensive signaling.

Key words: Abscisic acid, Protein kinase, Phosphorylation, Reactive oxygen species, Antioxidant defense

中图分类号:

Q 945

许树成1, 祝雪兰2, 张丽3. 蛋白激酶组在玉米叶片ABA和H2O2诱导抗氧化防护中的作用[J]. Plant Diversity, 2011, 33(3): 275-286.

XU Shu-Cheng-, ZHU Xue-Lan-, ZHANG Li. Role of Protein Kinases in Abscisic Acid and H2O2 Induced Antioxidant Defense in Maize[J]. Plant Diversity, 2011, 33(3): 275-286.

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