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 regulat ...

    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 RPC1 A1390Homo sapiensMutation(s): 0 
Gene Names: POLR3A
EC: 2.7.7.6
Find proteins for O14802 (Homo sapiens)
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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC2 B1133Homo sapiensMutation(s): 0 
Gene Names: POLR3B
EC: 2.7.7.6
Find proteins for Q9NW08 (Homo sapiens)
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Entity ID: 3
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC1 C346Homo sapiensMutation(s): 0 
Gene Names: POLR1CPOLR1E
Find proteins for O15160 (Homo sapiens)
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PHAROS:  O15160
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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC9 D148Homo sapiensMutation(s): 0 
Gene Names: CRCP
Find proteins for O75575 (Homo sapiens)
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC1 E210Homo sapiensMutation(s): 0 
Gene Names: POLR2E
Find proteins for P19388 (Homo sapiens)
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC2 F127Homo sapiensMutation(s): 0 
Gene Names: POLR2FPOLRF
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC8 G204Homo sapiensMutation(s): 0 
Gene Names: POLR3HKIAA1665RPC8
Find proteins for Q9Y535 (Homo sapiens)
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC3 H150Homo sapiensMutation(s): 0 
Gene Names: POLR2H
Find proteins for P52434 (Homo sapiens)
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC10 I108Homo sapiensMutation(s): 0 
Gene Names: POLR3KRPC11My010
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC5 J67Homo sapiensMutation(s): 0 
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC2 K133Homo sapiensMutation(s): 0 
Gene Names: POLR1D
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC4 L58Homo sapiensMutation(s): 0 
Gene Names: POLR2K
Find proteins for P53803 (Homo sapiens)
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC5 M708Homo sapiensMutation(s): 0 
Gene Names: POLR3EKIAA1452
Find proteins for Q9NVU0 (Homo sapiens)
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Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC4 N398Homo sapiensMutation(s): 0 
Gene Names: POLR3DBN51BN51T
Find proteins for P05423 (Homo sapiens)
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC3 O534Homo sapiensMutation(s): 0 
Gene Names: POLR3C
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC6 P316Homo sapiensMutation(s): 0 
Gene Names: POLR3F
Find proteins for Q9H1D9 (Homo sapiens)
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Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC7 Q223Homo sapiensMutation(s): 0 
Gene Names: POLR3G
Find proteins for O15318 (Homo sapiens)
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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
    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 

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