7B0Y

Structure of a transcribing RNA polymerase II-U1 snRNP complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

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This is version 1.1 of the entry. See complete history


Literature

Structure of a transcribing RNA polymerase II-U1 snRNP complex.

Zhang, S.Aibara, S.Vos, S.M.Agafonov, D.E.Luhrmann, R.Cramer, P.

(2021) Science 371: 305-309

  • DOI: 10.1126/science.abf1870
  • Primary Citation of Related Structures:  
    7B0Y

  • PubMed 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 ...

    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.


    Organizational Affiliation

    Department of Molecular Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, 37077 Göttingen, Germany. patrick.cramer@mpibpc.mpg.de.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase II subunit RPB1A1970Sus scrofa domesticusMutation(s): 0 
EC: 2.7.7.6
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase subunit betaB1174Sus scrofa domesticusMutation(s): 0 
Gene Names: POLR2B
EC: 2.7.7.6
UniProt
Find proteins for A0A0B8RVL1 (Sus scrofa domesticus)
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Entity ID: 3
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DNA-directed RNA polymerase II subunit RPB3C275Sus scrofa domesticusMutation(s): 0 
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Entity ID: 4
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DNA-directed RNA polymerase II subunit DD142Sus scrofa domesticusMutation(s): 0 
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase II subunit EE210Sus scrofa domesticusMutation(s): 0 
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Entity ID: 6
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DNA-directed RNA polymerase II subunit FF127Sus scrofa domesticusMutation(s): 0 
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase II subunit RPB7G172Sus scrofa domesticusMutation(s): 0 
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC3H150Sus scrofa domesticusMutation(s): 0 
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Entity ID: 9
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DNA-directed RNA polymerase II subunit RPB9I125Sus scrofa domesticusMutation(s): 0 
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Entity ID: 10
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DNA-directed RNA polymerases I, II, and III subunit RPABC5J67Sus scrofa domesticusMutation(s): 0 
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Entity ID: 11
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DNA-directed RNA polymerase II subunit RPB11-aK117Sus scrofa domesticusMutation(s): 0 
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Entity ID: 12
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RPB12L58Sus scrofa domesticusMutation(s): 0 
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Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
U1 small nuclear ribonucleoprotein 70 kDaQ [auth b]437Homo sapiensMutation(s): 0 
Gene Names: SNRNP70RNPU1ZRPU1SNRP70U1AP1
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Entity ID: 18
MoleculeChainsSequence LengthOrganismDetailsImage
U1 small nuclear ribonucleoprotein AR [auth c]282Homo sapiensMutation(s): 0 
Gene Names: SNRPA
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Entity ID: 19
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein Sm D2S [auth e]118Homo sapiensMutation(s): 0 
Gene Names: SNRPD2SNRPD1
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Entity ID: 20
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein FT [auth f]86Homo sapiensMutation(s): 0 
Gene Names: SNRPFPBSCF
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Entity ID: 21
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein EU [auth g]92Homo sapiensMutation(s): 0 
Gene Names: SNRPE
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Entity ID: 22
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein GV [auth h]76Homo sapiensMutation(s): 0 
Gene Names: SNRPGPBSCG
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Entity ID: 23
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein Sm D3W [auth i]126Homo sapiensMutation(s): 0 
Gene Names: SNRPD3
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Entity ID: 24
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein-associated proteinX [auth j]231Homo sapiensMutation(s): 0 
Gene Names: SNRPBhCG_2039421
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Entity ID: 25
MoleculeChainsSequence LengthOrganismDetailsImage
Small nuclear ribonucleoprotein Sm D1Y [auth k]119Homo sapiensMutation(s): 0 
Gene Names: SNRPD1
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Entity ID: 13
MoleculeChainsLengthOrganismImage
Non-template DNAM [auth N]48synthetic construct
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Entity ID: 14
MoleculeChainsLengthOrganismImage
145-nt RNAN [auth P]145synthetic construct
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Entity ID: 15
MoleculeChainsLengthOrganismImage
Template DNAO [auth T]48synthetic construct
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Entity ID: 16
MoleculeChainsLengthOrganismImage
U1 snRNAP [auth a]164Homo sapiens
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.60 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
European Molecular Biology Organization (EMBO)ALTF 830-2018
H2020 Marie Curie Actions of the European Commission894862
European Research Council (ERC)882357
German Research Foundation (DFG)EXC 2067/1-390729940

Revision History  (Full details and data files)

  • Version 1.0: 2021-01-13
    Type: Initial release
  • Version 1.1: 2021-01-27
    Changes: Database references