Feedback control of PLK1 by Apolo1 ensures accurate chromosome segregation.

Feedback control of PLK1 by Apolo1 ensures accurate chromosome segregation.
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Apolo1 对 PLK1 的反馈控制可确保准确的染色体分离

DOI:
10.1016/j.celrep.2021.109343
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发表时间:
2021-07-13
期刊:
影响因子:
8.8
通讯作者:
Yao X
Yao X
中科院分区:
生物学1区
文献类型:
--
作者:
Xu L;Ali M;Duan W;Yuan X;Garba F;Mullen M;Sun B;Poser I;Duan H;Lu J;Tian R;Ge Y;Chu L;Pan W;Wang D;Hyman A;Green H;Li L;Dou Z;Liu D;Liu X;Yao X

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细胞分裂过程中遗传物质的稳定传递需要准确的染色体分离。着丝粒处的 PLK1 动力学控制正确着丝粒-微管附着的建立以及随后纺锤体检查点的沉默。然而,负责前期 PLK1 活性的调控机制尚未明确。在这里,我们确定了 Apolo1,它可以调节 PLK1 活性以实现准确的着丝粒-微管附着。 Apolo1 在早期有丝分裂期间定位于动粒,抑制 Apolo1 会导致染色体错位。使用基于荧光共振能量转移 (FRET) 的 PLK1 活性报告基因,我们发现 Apolo1 在动粒处维持 PLK1 激酶活性,以便在前期准确附着。 Apolo1 是 PLK1 的同源底物,磷酸化使 PP1γ 能够通过去磷酸化使 PLK1 失活。从机制上讲,Apolo1 构成了激酶和磷酸酶之间的桥梁,控制着中期的 PLK1 活性。这些发现定义了一个以前未表征的反馈环路,Apolo1 通过该环路为 PLK1 提供微调,以指导有丝分裂中的染色体分离。徐等人。鉴定出 Apolo1,它控制 PLK1 活性,并通过桥接激酶和磷酸酶活性促进前期染色体的忠实分离。
Stable transmission of genetic material during cell division requires accurate chromosome segregation. PLK1 dynamics at kinetochores control establishment of correct kinetochore-microtubule attachments and subsequent silencing of the spindle checkpoint. However, the regulatory mechanism responsible for PLK1 activity in prometaphase has not yet been affirmatively identified. Here we identify Apolo1, which tunes PLK1 activity for accurate kinetochore-microtubule attachments. Apolo1 localizes to kinetochores during early mitosis, and suppression of Apolo1 results in misaligned chromosomes. Using the fluorescence resonance energy transfer (FRET)-based PLK1 activity reporter, we found that Apolo1 sustains PLK1 kinase activity at kinetochores for accurate attachment during prometaphase. Apolo1 is a cognate substrate of PLK1, and the phosphorylation enables PP1γ to inactivate PLK1 by dephosphorylation. Mechanistically, Apolo1 constitutes a bridge between kinase and phosphatase, which governs PLK1 activity in prometaphase. These findings define a previously uncharacterized feedback loop by which Apolo1 provides fine-tuning for PLK1 to guide chromosome segregation in mitosis. Xu et al. identify Apolo1, which governs PLK1 activity and promotes faithful chromosome segregation in prometaphase by bridging kinase and phosphatase activities.
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