Mitotic spindle association of TACC3 requires Aurora-A-dependent stabilization of a cryptic α-helix.

Mitotic spindle association of TACC3 requires Aurora-A-dependent stabilization of a cryptic α-helix.
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DOI:
10.15252/embj.201797902
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发表时间:
2018-04-13
期刊:
The EMBO journal
影响因子:
--
通讯作者:
Bayliss R
Bayliss R
中科院分区:
其他
文献类型:
--
作者:
Burgess SG;Mukherjee M;Sabir S;Joseph N;Gutiérrez-Caballero C;Richards MW;Huguenin-Dezot N;Chin JW;Kennedy EJ;Pfuhl M;Royle SJ;Gergely F;Bayliss R

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极光激酶A(Aurora - A)通过与网格蛋白重链(CHC)的磷酸化依赖性相互作用来调节TACC3向有丝分裂纺锤体的募集。在此,我们描述了这些相互作用的结构基础,其由TACC3无序区域中的三个基序介导。一个疏水对接基序与极光激酶A上一个先前未被鉴定的口袋结合,该口袋在大多数激酶中是被封闭的。对接基序的缺失会导致有丝分裂后期延迟,这与极光激酶A复合物的细胞分布情况相符。丝氨酸558的磷酸化使第二个基序发生构象转换,从结合激酶活性位点所需的无序状态转变为螺旋构象。该螺旋延伸到第三个相邻基序,它被CHC的一个螺旋重复区域识别,而不是被一个已知的磷酸化识别结构域识别。这种潜在的广泛存在的磷酸化识别机制比以磷酸结合为主的经典识别基序在调节相互作用的分子细节方面具有更大的灵活性。
Aurora‐A regulates the recruitment of TACC3 to the mitotic spindle through a phospho‐dependent interaction with clathrin heavy chain (CHC). Here, we describe the structural basis of these interactions, mediated by three motifs in a disordered region of TACC3. A hydrophobic docking motif binds to a previously uncharacterized pocket on Aurora‐A that is blocked in most kinases. Abrogation of the docking motif causes a delay in late mitosis, consistent with the cellular distribution of Aurora‐A complexes. Phosphorylation of Ser558 engages a conformational switch in a second motif from a disordered state, needed to bind the kinase active site, into a helical conformation. The helix extends into a third, adjacent motif that is recognized by a helical‐repeat region of CHC, not a recognized phospho‐reader domain. This potentially widespread mechanism of phospho‐recognition provides greater flexibility to tune the molecular details of the interaction than canonical recognition motifs that are dominated by phosphate binding.
Aurora在有丝分裂中依赖于中心体依赖的微管组装需要TACC3/Maskin的磷酸化。
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