Coiled-coil structure of meiosis protein TEX12 and conformational regulation by its C-terminal tip.

Coiled-coil structure of meiosis protein TEX12 and conformational regulation by its C-terminal tip.
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DOI:
10.1038/s42003-022-03886-9
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发表时间:
2022-09-07
影响因子:
5.9
通讯作者:
--
中科院分区:
生物学2区
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--
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减数分裂蛋白 TEX12 是联会复合体 (SC) 的重要组成部分,可介导同源染色体联会。它也在减数分裂中被招募到中心体,并且在某些癌症中异常地被招募到中心体,导致中心体功能障碍。在 SC 内,TEX12 与 SYCE2 形成交织的复合物,在 TEX12 的 C 末端尖端驱动下进行纤维组装。然而,我们迄今为止缺乏有关 TEX12 的 SYCE2 独立功能的结构信息。在这里,我们报告了三种不同构象的 TEX12 突变体的 X 射线晶体结构,并利用溶液光和 X 射线散射来确定其野生型二聚体四螺旋卷曲螺旋结构。 TEX12 在 C 末端突变后发生构象变化,表明负责驱动 SC 内 SYCE2-TEX12 组装的序列也控制分离的 TEX12 的寡聚状态和构象。我们的研究结果为 TEX12 的 SYCE2 独立作用提供了结构基础,包括 SC 组装的可能调节,及其在减数分裂中心体和癌症中的已知功能。卷曲螺旋蛋白癌睾丸抗原 TEX12 C 端突变体的 X 射线晶体结构与 TEX12 野生型二聚体的建模相结合,揭示了该蛋白对其寡聚状态的控制,这类似于其与联会复合体中心元件蛋白 SYCE2 的复合体的组装。
Meiosis protein TEX12 is an essential component of the synaptonemal complex (SC), which mediates homologous chromosome synapsis. It is also recruited to centrosomes in meiosis, and aberrantly in certain cancers, leading to centrosome dysfunction. Within the SC, TEX12 forms an intertwined complex with SYCE2 that undergoes fibrous assembly, driven by TEX12’s C-terminal tip. However, we hitherto lack structural information regarding SYCE2-independent functions of TEX12. Here, we report X-ray crystal structures of TEX12 mutants in three distinct conformations, and utilise solution light and X-ray scattering to determine its wild-type dimeric four-helical coiled-coil structure. TEX12 undergoes conformational change upon C-terminal tip mutations, indicating that the sequence responsible for driving SYCE2-TEX12 assembly within the SC also controls the oligomeric state and conformation of isolated TEX12. Our findings provide the structural basis for SYCE2-independent roles of TEX12, including the possible regulation of SC assembly, and its known functions in meiotic centrosomes and cancer. The X-ray crystal structures of C-terminal mutants of the coiled-coil protein cancer testis antigen TEX12 in combination with modeling of the TEX12 wild-type dimer reveal the protein’s control of its oligomeric state, which resembles assembly of its complex with synaptonemal complex central element protein SYCE2.
DOI: 10.1107/s090744491003982x
发表时间: 2011-04
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