7D58

cryo-EM structure of human RNA polymerase III in elongating state


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 2.90 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structural insights into transcriptional regulation of human RNA polymerase III.

Wang, Q.Li, S.Wan, F.Xu, Y.Wu, Z.Cao, M.Lan, P.Lei, M.Wu, J.

(2021) Nat Struct Mol Biol 28: 220-227

  • DOI: 10.1038/s41594-021-00557-x
  • Primary Citation of Related Structures:  
    7D58, 7D59

  • PubMed Abstract: 
  • RNA polymerase III (Pol III) synthesizes structured, essential small RNAs, such as transfer RNA, 5S ribosomal RNA and U6 small nuclear RNA. Pol III, the largest nuclear RNA polymerase, is composed of a conserved core region and eight constitutive regulatory subunits, but how these factors jointly regulate Pol III transcription remains unclear ...

    RNA polymerase III (Pol III) synthesizes structured, essential small RNAs, such as transfer RNA, 5S ribosomal RNA and U6 small nuclear RNA. Pol III, the largest nuclear RNA polymerase, is composed of a conserved core region and eight constitutive regulatory subunits, but how these factors jointly regulate Pol III transcription remains unclear. Here, we present cryo-EM structures of human Pol III in both apo and elongating states, which unveil both an orchestrated movement during the apo-to-elongating transition and an unexpected apo state in which the RPC7 subunit tail occupies the DNA-RNA-binding cleft of Pol III, suggesting that RPC7 plays important roles in both autoinhibition and transcription initiation. The structures also reveal a proofreading mechanism for the TFIIS-like subunit RPC10, which stably retains its catalytic position in the secondary channel, explaining the high fidelity of Pol III transcription. Our work provides an integrated picture of the mechanism of Pol III transcription regulation.


    Organizational Affiliation

    Shanghai Institute of Precision Medicine, Shanghai, China. wujian@shsmu.edu.cn.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC1A1390Homo sapiensMutation(s): 0 
Gene Names: POLR3A
EC: 2.7.7.6
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC2B1133Homo sapiensMutation(s): 0 
Gene Names: POLR3B
EC: 2.7.7.6
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC1C346Homo sapiensMutation(s): 0 
Gene Names: POLR1CPOLR1E
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC9D148Homo sapiensMutation(s): 0 
Gene Names: CRCP
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC1E210Homo sapiensMutation(s): 0 
Gene Names: POLR2E
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC2F127Homo sapiensMutation(s): 0 
Gene Names: POLR2FPOLRF
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC8G204Homo sapiensMutation(s): 0 
Gene Names: POLR3HKIAA1665RPC8
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC3H150Homo sapiensMutation(s): 0 
Gene Names: POLR2H
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC10I108Homo sapiensMutation(s): 0 
Gene Names: POLR3KRPC11My010
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC5J67Homo sapiensMutation(s): 0 
Gene Names: POLR2L
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC2K133Homo sapiensMutation(s): 0 
Gene Names: POLR1D
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC4L58Homo sapiensMutation(s): 0 
Gene Names: POLR2K
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC5M708Homo sapiensMutation(s): 0 
Gene Names: POLR3EKIAA1452
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Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC4N398Homo sapiensMutation(s): 0 
Gene Names: POLR3DBN51BN51T
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC3O534Homo sapiensMutation(s): 0 
Gene Names: POLR3C
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC6P316Homo sapiensMutation(s): 0 
Gene Names: POLR3F
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Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC7Q223Homo sapiensMutation(s): 0 
Gene Names: POLR3G
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Entity ID: 18
MoleculeChainsLengthOrganismImage
Non-template DNAR41Homo sapiens
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Entity ID: 19
MoleculeChainsLengthOrganismImage
Template DNAS41Homo sapiens
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  • Entity ID: 20
    MoleculeChainsLengthOrganismImage
    RNAT20Homo sapiens
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    Experimental Data & Validation

    Experimental Data

    • Method: ELECTRON MICROSCOPY
    • Resolution: 2.90 Å
    • Aggregation State: PARTICLE 
    • Reconstruction Method: SINGLE PARTICLE 

    Structure Validation

    View Full Validation Report




    Entry History 

    Deposition Data

    Revision History  (Full details and data files)

    • Version 1.0: 2021-02-17
      Type: Initial release
    • Version 1.1: 2021-02-24
      Changes: Database references