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-Structure paper
タイトル | Structural insights into human exon-defined spliceosome prior to activation. |
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ジャーナル・号・ページ | Cell Res, Vol. 34, Issue 6, Page 428-439, Year 2024 |
掲載日 | 2024年4月24日 |
著者 | Wenyu Zhang / Xiaofeng Zhang / Xiechao Zhan / Rui Bai / Jianlin Lei / Chuangye Yan / Yigong Shi / |
PubMed 要旨 | Spliceosome is often assembled across an exon and undergoes rearrangement to span a neighboring intron. Most states of the intron-defined spliceosome have been structurally characterized. However, ...Spliceosome is often assembled across an exon and undergoes rearrangement to span a neighboring intron. Most states of the intron-defined spliceosome have been structurally characterized. However, the structure of a fully assembled exon-defined spliceosome remains at large. During spliceosome assembly, the pre-catalytic state (B complex) is converted from its precursor (pre-B complex). Here we report atomic structures of the exon-defined human spliceosome in four sequential states: mature pre-B, late pre-B, early B, and mature B. In the previously unknown late pre-B state, U1 snRNP is already released but the remaining proteins are still in the pre-B state; unexpectedly, the RNAs are in the B state, with U6 snRNA forming a duplex with 5'-splice site and U5 snRNA recognizing the 3'-end of the exon. In the early and mature B complexes, the B-specific factors are stepwise recruited and specifically recognize the exon 3'-region. Our study reveals key insights into the assembly of the exon-defined spliceosomes and identifies mechanistic steps of the pre-B-to-B transition. |
リンク | Cell Res / PubMed:38658629 / PubMed Central |
手法 | EM (単粒子) |
解像度 | 2.6 - 3.25 Å |
構造データ | EMDB-34500, PDB-8h6e: EMDB-34505, PDB-8h6j: EMDB-34507, PDB-8h6k: EMDB-34508, PDB-8h6l: |
化合物 | ChemComp-IHP: ChemComp-MG: ChemComp-GTP: ChemComp-ZN: |
由来 |
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キーワード | SPLICING / exon-defined spliceosome / late pre-B state / RNA splicing / Post pre-B state |