Small nuclear ribonucleoprotein F / DNA-directed RNA polymerase II subunit RPB9 / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein Sm D3 / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein Sm D1 / Small nuclear ribonucleoprotein Sm D2 / U1 small nuclear ribonucleoprotein A / DNA-directed RNA polymerase II subunit RPB1 / DNA-directed RNA polymerase II subunit RPB3 ...Small nuclear ribonucleoprotein F / DNA-directed RNA polymerase II subunit RPB9 / Small nuclear ribonucleoprotein E / Small nuclear ribonucleoprotein Sm D3 / Small nuclear ribonucleoprotein G / Small nuclear ribonucleoprotein Sm D1 / Small nuclear ribonucleoprotein Sm D2 / U1 small nuclear ribonucleoprotein A / DNA-directed RNA polymerase II subunit RPB1 / DNA-directed RNA polymerase II subunit RPB3 / U1 small nuclear ribonucleoprotein 70 kDa / DNA-directed RNA polymerase II subunit E / RNA polymerase II subunit K / DNA-directed RNA polymerase II subunit RPB7 / DNA-directed RNA polymerases I, II, and III subunit RPABC3 / DNA-directed RNA polymerase II subunit F / DNA-directed RNA polymerase II subunit RPB11-a / DNA-directed RNA polymerases I, II, and III subunit RPABC5 / RNA polymerase II subunit D / DNA-directed RNA polymerase subunit beta / Small nuclear ribonucleoprotein-associated protein
Biological species
Sus scrofa domesticus (domestic pig) Homo sapiens (human) synthetic construct (others)
Method
ELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 3.6 Å
H2020 Marie Curie Actions of the European Commission
894862
European Research Council (ERC)
882357
German Research Foundation (DFG)
EXC 2067/1-390729940
Citation
Journal: Science / Year: 2021 Title: Structure of a transcribing RNA polymerase II-U1 snRNP complex. Authors: Suyang Zhang / Shintaro Aibara / Seychelle M Vos / Dmitry E Agafonov / Reinhard Lührmann / Patrick Cramer / 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 ...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.
A: DNA-directed RNA polymerase II subunit RPB1 B: DNA-directed RNA polymerase subunit beta C: DNA-directed RNA polymerase II subunit RPB3 D: DNA-directed RNA polymerase II subunit D E: DNA-directed RNA polymerase II subunit E F: DNA-directed RNA polymerase II subunit F G: DNA-directed RNA polymerase II subunit RPB7 H: DNA-directed RNA polymerases I, II, and III subunit RPABC3 I: DNA-directed RNA polymerase II subunit RPB9 J: DNA-directed RNA polymerases I, II, and III subunit RPABC5 K: DNA-directed RNA polymerase II subunit RPB11-a L: RPB12 N: Non-template DNA P: 145-nt RNA T: Template DNA a: U1 snRNA b: U1 small nuclear ribonucleoprotein 70 kDa c: U1 small nuclear ribonucleoprotein A e: Small nuclear ribonucleoprotein Sm D2 f: Small nuclear ribonucleoprotein F g: Small nuclear ribonucleoprotein E h: Small nuclear ribonucleoprotein G i: Small nuclear ribonucleoprotein Sm D3 j: Small nuclear ribonucleoprotein-associated protein k: Small nuclear ribonucleoprotein Sm D1 hetero molecules
DNA-directedRNApolymeraseIIsubunitRPB1 / Polymerase / RNA polymerase II subunit B1 / DNA-directed RNA polymerase II subunit A / DNA-directed RNA ...RNA polymerase II subunit B1 / DNA-directed RNA polymerase II subunit A / DNA-directed RNA polymerase III largest subunit
Mass: 217450.078 Da / Num. of mol.: 1 / Source method: isolated from a natural source / Source: (natural) Sus scrofa domesticus (domestic pig) / References: UniProt: P11414, DNA-directed RNA polymerase
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