Structural basis of meiotic chromosome synapsis through SYCP1 self-assembly.

Structural basis of meiotic chromosome synapsis through SYCP1 self-assembly.
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DOI:
10.1038/s41594-018-0078-9
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发表时间:
2018-07
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:
Dunce JM;Dunne OM;Ratcliff M;Millán C;Madgwick S;Usón I;Davies OR

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减数分裂染色体采用独特的结构,其中染色质环的线性阵列通过超分子蛋白质组装(联会复合体)结合在一起形成同源染色体对。这种三维支架通过交叉和随后的同源分离为遗传交换提供了必要的结构框架。联会复合体的核心结构由SYCP 1提供。在这里,我们报告的结构和自组装机制的人SYCP 1通过X射线晶体学和生物物理研究。SYCP 1具有专性四聚体结构,其中N-末端四螺旋束分叉成两个伸长的C-末端二聚体卷曲螺旋。这种积木通过两个自组装位点组装成拉链状的晶格。N-末端位点在中线进行头对头的协同组装,而C-末端位点在染色体轴上背靠背相互作用。我们的工作揭示了突触复合体的基本分子结构,其中SYCP 1自组装产生介导减数分裂染色体突触的超分子晶格。
Meiotic chromosomes adopt unique structures in which linear arrays of chromatin loops are bound together in homologous chromosome pairs by a supramolecular protein assembly, the synaptonemal complex. This three-dimensional scaffold provides the essential structural framework for genetic exchange by crossing over and subsequent homologue segregation. The core architecture of the synaptonemal complex is provided by SYCP1. Here, we report the structure and self-assembly mechanism of human SYCP1 through X-ray crystallographic and biophysical studies. SYCP1 has an obligate tetrameric structure in which an N-terminal four-helical bundle bifurcates into two elongated C-terminal dimeric coiled-coils. This building-block assembles into a zipper-like lattice through two self-assembly sites. N-terminal sites undergo cooperative head-to-head assembly in the midline, whilst C-terminal sites interact back-to-back on the chromosome axis. Our work reveals the underlying molecular structure of the synaptonemal complex in which SYCP1 self-assembly generates a supramolecular lattice that mediates meiotic chromosome synapsis.
DOI: 10.1107/s090744491003982x
发表时间: 2011-04
期刊: Acta crystallographica. Section D, Biological crystallography
影响因子: --
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通讯作者: Evans PR
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发表时间: 2012-07
期刊: Open biology
影响因子: 5.8
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影响因子: 6.1
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