Structural maturation of SYCP1-mediated meiotic chromosome synapsis by SYCE3.

Structural maturation of SYCP1-mediated meiotic chromosome synapsis by SYCE3.
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DOI:
10.1038/s41594-022-00909-1
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发表时间:
2023-03
影响因子:
16.8
通讯作者:
Davies OR
Davies OR
中科院分区:
生物学1区
文献类型:
--
作者:
Crichton JH;Dunce JM;Dunne OM;Salmon LJ;Devenney PS;Lawson J;Adams IR;Davies OR

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在减数分裂中,一种超分子蛋白质结构,联会复合体(SC),在同源染色体之间组装以促进它们的重组。哺乳动物SC的形成被认为涉及SYCP 1蛋白晶格的分级拉链样组装,该蛋白晶格在其延伸时招募稳定中心元件(CE)蛋白。在这里,我们结合联合收割机的生化方法与分离的功能突变小鼠显示,而不是稳定SYCP 1晶格,CE蛋白SYCE 3积极重塑突触过程中的这种结构。我们发现,SYCP 1四聚体进行构象变化为2:1异源三聚体后SYCE 3结合,消除其组装接口和破坏SYCP 1晶格。SYCE 3然后通过其自组装建立一个新的晶格,模仿破坏的界面在将SYCP 1二聚体拴在一起时的作用。SYCE 3还与CE复合物SYCE 1-SIX 6 OS 1和SYCE 2-TEX 12相互作用,提供了它们的募集机制。因此,SYCE 3将SYCP 1晶格重塑为CE结合整合的SYCP 1-SYCE 3晶格,以通过成熟SC实现长程突触。
In meiosis, a supramolecular protein structure, the synaptonemal complex (SC), assembles between homologous chromosomes to facilitate their recombination. Mammalian SC formation is thought to involve hierarchical zipper-like assembly of an SYCP1 protein lattice that recruits stabilising central element (CE) proteins as it extends. Here, we combine biochemical approaches with separation-of-function mutagenesis in mice to show that, rather than stabilising the SYCP1 lattice, the CE protein SYCE3 actively remodels this structure during synapsis. We find that SYCP1 tetramers undergo conformational change into 2:1 heterotrimers upon SYCE3-binding, removing their assembly interfaces and disrupting the SYCP1 lattice. SYCE3 then establishes a new lattice by its self-assembly mimicking the role of the disrupted interface in tethering together SYCP1 dimers. SYCE3 also interacts with CE complexes SYCE1-SIX6OS1 and SYCE2-TEX12, providing a mechanism for their recruitment. Thus, SYCE3 remodels the SYCP1 lattice into a CE-binding integrated SYCP1-SYCE3 lattice to achieve long-range synapsis by a mature SC.
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发表时间: 2018-07
影响因子: 16.8
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通讯作者: Davies OR
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