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热激信号转导中的钙-钙调素途径

DOI: 10.3321/j.issn:1000-7091.2003.z1.007, PP. 24-29

Keywords: 钙离子,钙调素,热激蛋白,热激转录因子,信号转导

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Abstract:

大量证据证明钙-钙调素(Ca2+CaM)信号系统参与植物的热激信号转导。用激光共聚焦扫描显微镜研究小麦胞内Ca2+浓度的变化,37℃热激可引起小麦胞内自由Ca2+浓度的迅速提高。在Ca2+存在条件下,热激也引起小麦CaM基因CaM1-2的表达及细胞内CaM蛋白含量的提高。用CaCl2处理小麦幼苗明显提高小麦热激基因hsp26和hsp70的表达和热激蛋白的合成,而Ca2+的螯合剂EGTA,Ca2+通道阻断剂异博定和LaCl3、CaM抑制剂W7、TFP和CPZ明显降低了热激基因hsp26和hsp70的表达和热激蛋白的合成。EGTA、易博定、TFP或CPZ的处理也阻止小麦耐热性的获得。小麦CaM基因与热激基因的表达动力学研究表明CaM位于热激信号转导的上游,而Ca2+是热激启动的胞内关键因子。凝胶阻滞分析提出Ca2+CaM在热激信号转导中的作用是通过激活热激转录因子的DNA结合活性来实现的。提出在植物细胞内存在一条新的热激信号转导途径:钙-钙调素途径。

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