Structure of a transcribing RNA polymerase II-U1 snRNP complex.
Science
; 371(6526): 305-309, 2021 01 15.
Article
em En
| MEDLINE
| ID: mdl-33446560
ABSTRACT
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.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
RNA Polimerase II
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RNA Mensageiro
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Spliceossomos
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Ribonucleoproteína Nuclear Pequena U1
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Processamento Alternativo
Limite:
Animals
/
Humans
Idioma:
En
Ano de publicação:
2021
Tipo de documento:
Article