Dissecting the telomere-inner nuclear membrane interface formed in meiosis.

Dissecting the telomere-inner nuclear membrane interface formed in meiosis.
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DOI:
10.1038/nsmb.3493
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发表时间:
2017-12
影响因子:
16.8
通讯作者:
Nandakumar J
Nandakumar J
中科院分区:
生物学1区
文献类型:
--
作者:
Pendlebury DF;Fujiwara Y;Tesmer VM;Smith EM;Shibuya H;Watanabe Y;Nandakumar J

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将端粒束缚在内核膜(INM)上可以在减数分裂过程中实现同源染色体配对。减数分裂特异性蛋白 TERB1 与端粒蛋白 TRF1 结合以建立端粒-INM 连接,对于小鼠的生育能力至关重要。在这里,我们解析了人类 TRF1-TERB1 接口的结构,以揭示端粒-INM 连接的结构基础。该界面的破坏会消除小鼠体内端粒-INM 的结合并损害端粒-INM 的附着。 TERB1 的 TRF1 结合区内嵌入的 CDK 磷酸化位点提供了一种帽子交换机制,这是一种涉及 TRF1-TERB1 复合物解离的粗线期晚期现象。事实上,进一步加强这种互动会干扰上限交换。最后,我们的生化分析表明减数分裂期间端粒-INM 束缚和染色体末端保护的不同复合物。我们的研究揭示了端粒-INM束缚的结构、化学计量学和生理学意义,从而为端粒在减数分裂中的独特功能提供了前所未有的见解。
Tethering telomeres to the inner nuclear membrane (INM) allows for homologous chromosome pairing during meiosis. A meiosis-specific protein TERB1 binds the telomeric protein TRF1 to establish telomere-INM connectivity and is essential for mouse fertility. Here we solve the structure of the human TRF1-TERB1 interface to reveal the structural basis for telomere-INM linkage. Disruption of this interface abrogates binding and compromises telomere-INM attachment in mice. An embedded CDK-phosphorylation site within the TRF1-binding region of TERB1 provides a mechanism for cap exchange, a late-pachytene phenomenon involving the dissociation of the TRF1-TERB1 complex. Indeed, further strengthening this interaction interferes with cap exchange. Finally, our biochemical analysis implicates distinct complexes for telomere-INM tethering and chromosome end protection during meiosis. Our studies unravel the structure, stoichiometry, and physiological implications underlying telomere-INM tethering, thereby providing unprecedented insights into the unique function of telomeres in meiosis.
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