檢查點(diǎn)激酶|Checkpoint Kinase
檢查點(diǎn)激酶(Checkpoint Kinases,Chk)是參與細(xì)胞周期調(diào)控的蛋白激酶。已鑒定出兩種檢查點(diǎn)激酶亞型:Chk1和Chk2。Chk1是基因組監(jiān)視途徑的核心組成部分,是細(xì)胞周期和細(xì)胞存活的關(guān)鍵調(diào)控因子。Chk1是啟動(dòng)DNA損傷檢查點(diǎn)所必需的,最近被證明在正常(未受干擾的)細(xì)胞周期中起作用。Chk1影響細(xì)胞周期的各個(gè)階段,包括S期、G2/M期和M期。除了介導(dǎo)細(xì)胞周期檢查點(diǎn)外,Chk1還參與DNA修復(fù)過(guò)程、基因轉(zhuǎn)錄、胚胎發(fā)育、細(xì)胞對(duì)HIV感染的反應(yīng)和體細(xì)胞活性。Chk2是一種蛋白激酶,在DNA損傷時(shí)被激活,參與細(xì)胞周期阻滯。為了應(yīng)對(duì)DNA損傷和復(fù)制阻滯,細(xì)胞周期的進(jìn)程通過(guò)細(xì)胞周期調(diào)節(jié)器的控制而停止。該基因編碼的蛋白質(zhì)是一種細(xì)胞周期檢查點(diǎn)調(diào)節(jié)因子和假定的腫瘤抑制因子。
檢查點(diǎn)激酶
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