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通过Far1直接抑制酵母循环素依赖激酶Cdc28-Cln的直接抑制
1Department of Biochemistry and Biophysics, University of California at San Francisco 94143-0448.
Science (New York, N.Y.)
|August 26, 1994
概括
抗菌原α因子通过激活抑制Cdc28-Cln激酶的途径,触发了Saccharomyces cerevisiae中的细胞循环停止. 对于这种停止,Far1蛋白质是必不可少的,它直接抑制了Cdc28-Cln激酶的活性.
科学领域:
- * 分子和细胞生物学
- * 酵母遗传学公司
- * * 信号转导 信号转导
背景情况:
- *Saccharomyces cerevisiae利用信号传导途径在G1阶段停止细胞周期,以应对像α因子这样的抗菌原体.
- *这种捕获机制涉及抑制特定的循环素依赖激酶,这些激酶是细胞循环进展的关键调节者.
- * Far1蛋白已被确定为这种细胞反应途径的关键组成部分.
研究的目的:
- *阐明Far1蛋白在Saccharomyces cerevisiae中的α因子诱导的G1细胞周期停止中的精确作用.
- * 为了研究Far1通过哪种机制来调解林依赖性激酶Cdc28-Cln.的抑制.
- * 为了确认Far1的功能作为阿尔法因子信号级联中的最终效应器.
主要方法:
- * 通过使用α因子治疗,研究了Saccharomyces cerevisiae中的细胞循环停止.
- *分析了Far1蛋白与Cdc28-Cln复合物的关联.
- * 进行了体内和体外激酶试验,以评估Far1对Cdc28-Cln活性的抑制作用.
主要成果:
- *在Saccharomyces cerevisiae的G1阶段通过α因子阻止细胞循环,需要Far1蛋白的存在.
- * Far1 蛋白直接与 Cdc28-Cln 复合体结合.
- *Cdc28-Cln的激酶活性被Far1抑制,无论是在细胞内 (体内) 还是在纯化的系统中 (体外).
结论:
- *Far1对于Saccharomyces cerevisiae中α因子诱导的G1细胞周期停止至关重要.
- * Far1 功能位于阿尔法因子响应路径的终端阶段.
- *Far1直接抑制G1循环素依赖的激酶活性,特别是Cdc28-Cln,以调解细胞循环停止.
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