Bora phosphorylation substitutes in trans for T-loop phosphorylation in Aurora A to promote mitotic entry.

Bora phosphorylation substitutes in trans for T-loop phosphorylation in Aurora A to promote mitotic entry.
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DOI:
10.1038/s41467-021-21922-w
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发表时间:
2021-03-26
影响因子:
16.6
通讯作者:
Pintard L
Pintard L
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Tavernier N;Thomas Y;Vigneron S;Maisonneuve P;Orlicky S;Mader P;Regmi SG;Van Hove L;Levinson NM;Gasmi-Seabrook G;Joly N;Poteau M;Velez-Aguilera G;Gavet O;Castro A;Dasso M;Lorca T;Sicheri F;Pintard L

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Polo 样激酶 1 (Plk1) 对于有丝分裂的进入和进展至关重要。 Plk1 通过 Aurora A 激酶 (AURKA) 磷酸化其激活片段中的保守残基 Thr210 来激活,该反应关键需要 CyclinA/B-Cdk1 激酶磷酸化辅因子 Bora。在这里,我们证明磷酸-Bora 是 AURKA 激酶活性的直接激活剂。我们将磷酸-Bora 功能的关键决定因素定位于 100 个氨基酸区域,该区域包含两个短 Tpx2 样基序和丝氨酸 112 处的磷酸丝氨酸-脯氨酸基序,Bora 通过该基序结合 AURKA。后者反式取代了 AURKA 的 Thr288 磷酸调节位点,这对于激酶结构域的活性构象至关重要。我们证明了这些决定因素对于非洲爪蟾卵提取物和人类细胞有丝分裂进入中 Bora 功能的重要性。我们的研究结果揭示了 AURKA 的激活机制,这对于有丝分裂进入至关重要。塔维尼尔等人。破译了被 Cyclin-Cdk 磷酸化的内在无序蛋白 Bora 增强 AURKA 对 Polo 样激酶 1 活性的机制。此外,他们证明了这种机制对于爪蟾和人类细胞及时进入有丝分裂的重要性。
Polo-like kinase 1 (Plk1) is instrumental for mitotic entry and progression. Plk1 is activated by phosphorylation on a conserved residue Thr210 in its activation segment by the Aurora A kinase (AURKA), a reaction that critically requires the co-factor Bora phosphorylated by a CyclinA/B-Cdk1 kinase. Here we show that phospho-Bora is a direct activator of AURKA kinase activity. We localize the key determinants of phospho-Bora function to a 100 amino acid region encompassing two short Tpx2-like motifs and a phosphoSerine-Proline motif at Serine 112, through which Bora binds AURKA. The latter substitutes in trans for the Thr288 phospho-regulatory site of AURKA, which is essential for an active conformation of the kinase domain. We demonstrate the importance of these determinants for Bora function in mitotic entry both in Xenopus egg extracts and in human cells. Our findings unveil the activation mechanism of AURKA that is critical for mitotic entry. Tavernier et al. decipher the mechanism by which the intrinsically disordered protein Bora, phosphorylated by Cyclin-Cdk, potentiates AURKA activity towards Polo-like kinase 1. Furthermore, they demonstrate the importance of this mechanism for timely mitotic entry in Xenopus and human cells.
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