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-Structure paper
タイトル | Structure of a transcribing RNA polymerase II-U1 snRNP complex. |
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ジャーナル・号・ページ | Science, Vol. 371, Issue 6526, Page 305-309, Year 2021 |
掲載日 | 2021年1月15日 |
著者 | Suyang Zhang / Shintaro Aibara / Seychelle M Vos / Dmitry E Agafonov / Reinhard Lührmann / Patrick Cramer / |
PubMed 要旨 | To initiate cotranscriptional splicing, RNA polymerase II (Pol II) recruits the U1 small nuclear ribonucleoprotein particle (U1 snRNP) to nascent precursor messenger RNA (pre-mRNA). Here, we report ...To initiate cotranscriptional splicing, RNA polymerase II (Pol II) recruits the U1 small nuclear ribonucleoprotein particle (U1 snRNP) to nascent precursor messenger RNA (pre-mRNA). Here, we report the cryo-electron microscopy structure of a mammalian transcribing Pol II-U1 snRNP complex. The structure reveals that Pol II and U1 snRNP interact directly. This interaction positions the pre-mRNA 5' splice site near the RNA exit site of Pol II. Extension of pre-mRNA retains the 5' splice site, leading to the formation of a "growing intron loop." Loop formation may facilitate scanning of nascent pre-mRNA for the 3' splice site, functional pairing of distant intron ends, and prespliceosome assembly. Our results provide a starting point for a mechanistic analysis of cotranscriptional spliceosome assembly and the biogenesis of mRNA isoforms by alternative splicing. |
リンク | Science / PubMed:33446560 |
手法 | EM (単粒子) |
解像度 | 3.2 - 5.9 Å |
構造データ | EMDB-11972: Overall map of a transcribing RNA polymerase II-U1 snRNP complex with 145-nt RNA EMDB-11973: EMDB-11974: EMDB-11975: |
化合物 | ChemComp-ZN: ChemComp-MG: |
由来 |
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キーワード | SPLICING / Transcription / co-transcriptional spliceosome assembly |