Structural basis of branch site recognition by the human spliceosome.

Structural basis of branch site recognition by the human spliceosome.
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人类剪接体识别分支位点的结构基础。

DOI:
10.1126/science.abm4245
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发表时间:
2022-01-07
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Galej WP
Galej WP
中科院分区:
其他
文献类型:
--
作者:
Tholen J;Razew M;Weis F;Galej WP

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U2 snRNP对内含子分支位点(BS)的识别是剪接体组装过程中的一个关键事件。在哺乳动物中,BS序列保守性较差,不能仅通过碱基配对机制实现明确的内含子识别。我们分离了人17S U2 snRNP,并在体外重建了其atp依赖性重构和与pre-mRNA底物的结合。我们确定了一系列高分辨率(2.0-2.2 Å)结构,提供BS选择过程的快照。底物结合的U2 snRNP表明SF3B6稳定了BS:U2 snRNA双工,有助于结合序列互补性差的内含子。atp依赖性重构从底物结合解耦捕获U2 snRNA,其构象与BS识别竞争,提供基于分支螺旋稳定性的选择机制。
Recognition of the intron branch site (BS) by the U2 snRNP is a critical event during spliceosome assembly. In mammals, BS sequences are poorly conserved and unambiguous intron recognition cannot be achieved solely via a base-pairing mechanism. We isolated human 17S U2 snRNP and reconstituted in vitro its ATP-dependent remodelling and binding to the pre-mRNA substrate. We determined a series of high-resolution (2.0-2.2 Å) structures providing snapshots of the BS selection process. The substrate-bound U2 snRNP shows that SF3B6 stabilises the BS:U2 snRNA duplex, which could aid binding of introns with poor sequence complementarity. ATP-dependent remodelling uncoupled from substrate binding captures U2 snRNA in a conformation that competes with BS recognition, providing a selection mechanism based on branch helix stability.
DOI: 10.1038/nprot.2018.042
发表时间: 2018-06
期刊: Nature protocols
影响因子: 14.8
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