Phosphorylation of SKAP by GSK3β ensures chromosome segregation by a temporal inhibition of Kif2b activity.

Phosphorylation of SKAP by GSK3β ensures chromosome segregation by a temporal inhibition of Kif2b activity.
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GSK3 beta 磷酸化 SKAP 通过暂时抑制 Kif2b 活性确保染色体分离

DOI:
10.1038/srep38791
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发表时间:
2016-12-16
期刊:
影响因子:
4.6
通讯作者:
Yao X
Yao X
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Qin B;Cao D;Wu H;Mo F;Shao H;Chu J;Powell M;Aikhionbare F;Wang D;Fu C;He P;Pan W;Wang W;Liu X;Yao X

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有丝分裂中染色体的分离是由动粒和纺锤体微管之间的动态相互作用协调的。我们最近的研究表明SKAP是一种依赖于EB 1的微管加末端跟踪蛋白,在有丝分裂过程中对动粒振荡至关重要。在这里,我们发现SKAP被GSK 3 β磷酸化通过竞争Kif 2b与微管+末端结合来调节Kif 2b解聚酶活性。SKAP在体外是GSK 3 β的真正底物,其磷酸化对于细胞中的微管-着丝粒的精确附着是必需的。通过质谱分析确定了GSK 3 β诱导的磷酸化位点,SKAP的磷酸化模拟突变体可以挽救SKAP抑制细胞中染色体错误分离的表型。重要的是,GSK 3 β诱导的磷酸化促进SKAP与Kif 2b结合,以调节其在微管正末端的解聚酶活性。基于这些发现,我们推断GSK 3 β-SKAP-Kif 2b信号轴构成了纺锤体微管+末端和有丝分裂染色体之间的动态联系,以实现忠实的细胞分裂。
Chromosome segregation in mitosis is orchestrated by the dynamic interactions between the kinetochore and spindle microtubules. Our recent study shows SKAP is an EB1-dependent, microtubule plus-end tracking protein essential for kinetochore oscillations during mitosis. Here we show that phosphorylation of SKAP by GSK3β regulates Kif2b depolymerase activity by competing Kif2b for microtubule plus-end binding. SKAP is a bona fide substrate of GSK3β in vitro and the phosphorylation is essential for an accurate kinetochore-microtubule attachment in cells. The GSK3β-elicited phosphorylation sites were mapped by mass spectrometry and the phosphomimetic mutant of SKAP can rescue the phenotype of chromosome missegregation in SKAP-suppressed cells. Importantly, GSK3β-elicited phosphorylation promotes SKAP binding to Kif2b to regulate its depolymerase activity at the microtubule plus-ends. Based on those findings, we reason that GSK3β-SKAP-Kif2b signaling axis constitutes a dynamic link between spindle microtubule plus-ends and mitotic chromosomes to achieve faithful cell division.
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