Mps1 kinase activity restrains anaphase during an unperturbed mitosis and targets Mad2 to kinetochores.

Mps1 kinase activity restrains anaphase during an unperturbed mitosis and targets Mad2 to kinetochores.
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DOI:
10.1083/jcb.200712028
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发表时间:
2008-06-16
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Taylor S
Taylor S
中科院分区:
其他
文献类型:
--
作者:
Tighe A;Staples O;Taylor S

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Mps1是纺锤体组装检查点的上游组件,在人类细胞中,它是响应纺锤体损伤而激活检查点所必需的,但在未受干扰的有丝分裂过程中并不明显。MPS1还招募MAD1和MAD2担任动感家务。然而,这些过程是否需要Mps1的酶活性尚不清楚。为了解决这个问题,我们建立了RNA干扰(RNAi)互补分析方法。对Mps1的抑制会触发过早的后期,通常会导致染色体不对齐或定向错误。这种表型可被抗RNAi的野生型Mps1转基因拯救,但不能被催化失活的突变体拯救。一个类似敏感的等位基因Mps1M602A也可以挽救RNAi诱导的缺陷,但当被三磷酸腺苷类似物1-NM-PP1抑制时不能。因此,在未受干扰的有丝分裂过程中,Mps1的活性确实抑制了后期。此外,尽管催化失活的Mps1可以恢复MAD1的动粒定位,但只有激活的激酶才能恢复MAD2的定位。因此,在人类细胞中,Mps1的催化活性是纺锤体检查点功能和MAD2募集所必需的。
Mps1 is an upstream component of the spindle assembly checkpoint, which, in human cells, is required for checkpoint activation in response to spindle damage but not apparently during an unperturbed mitosis. Mps1 also recruits Mad1 and Mad2 to kinetochores. However, whether the enzymatic activity of Mps1 is required for these processes is unclear. To address this question, we established an RNA interference (RNAi) complementation assay. Repression of Mps1 triggers premature anaphase, often with unaligned or maloriented chromosomes. This phenotype is rescued by an RNAi-resistant wild-type Mps1 transgene but not by a catalytically inactive mutant. An analogue-sensitive allele, Mps1M602A, also rescues the RNAi-induced defect, but not when inhibited by the adenosine triphosphate analogue 1-NM-PP1. Thus, Mps1 activity does restrain anaphase during an unperturbed mitosis. Furthermore, although catalytically inactive Mps1 can restore kinetochore localization of Mad1, only the active kinase restores Mad2 localization. Thus, in human cells, Mps1 catalytic activity is required for spindle checkpoint function and recruitment of Mad2.
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