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在酵母中Cdc42依赖的MAPK信号传递过程中,p21激活激酶的周转和绕过
Beatriz González1, Mahnoosh Mirzaei1, Sukanya Basu1
1Department of Biological Sciences, State University of New York at Buffalo, Buffalo, New York, USA.
The Journal of biological chemistry
|September 29, 2023
概括
激活p21的激酶 (Ste20p) 是通过蛋白质体的循环调节,与Cdc42p结合稳定Ste20p. 确定了一种新的独立于Ste20p的信号通路,影响了丝状生长 (fMAPK) 调节.
科学领域:
- 细胞信号传递途径 细胞信号传递途径
- 分子生物学分子生物学
- 酵母遗传学 酵母遗传学
背景情况:
- 线素激活蛋白激酶 (MAPK) 途径对于细胞过程如应激反应和分化至关重要.
- 这些通路在真核生物中保存,并且通常涉及小GTPases和激酶之间的相互作用.
- 之前的研究突出显示,Cdc42p的周转率调节了酵母菌中的丝状生长MAPK (fMAPK) 途径.
研究的目的:
- 调查Ste20p的调节,这是一个参与MAPK通路的p21激活激酶.
- 在fMAPK路径中识别和描述不同的信号分支.
- 探索Cdc42p,Ste20p和下游信号组件之间的相互作用.
主要方法:
- 使用了酵母遗传学和分子生物学技术.
- 蛋白质的循环和稳定性使用蛋白质体降解试验进行了评估.
- 基因方法被用来剖析Ste20p-依赖和-独立的信号分支.
主要成果:
- 通过26S蛋白酶体的循环调节Ste20p,这种循环被Cdc42p结合抑制.
- 确定了fMAPK路径的Ste20p独立的信号分支.
- 这种独立的途径涉及Bem4p,并且受到Rga1p的负调节,Rga1p是Cdc42p的GTPase激活蛋白.
结论:
- 通过其与Cdc42p的相互作用来调节Ste20p的稳定性,从而影响fMAPK的信号传输.
- fMAPK路径包括不同的Ste20p依赖和独立的信号模块.
- 这些发现揭示了Rho GTPase和p21激活激酶信号传递的新型调节机制,可能适用于其他生物系统.
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