7DN3

Structure of Human RNA Polymerase III elongation complex


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.50 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

Structure of human RNA polymerase III elongation complex.

Li, L.Yu, Z.Zhao, D.Ren, Y.Hou, H.Xu, Y.

(2021) Cell Res 31: 791-800

  • DOI: 10.1038/s41422-021-00472-2
  • Primary Citation of Related Structures:  
    7DN3, 7DU2

  • PubMed Abstract: 
  • RNA polymerase III (Pol III) transcribes essential structured small RNAs, such as tRNAs, 5S rRNA and U6 snRNA. The transcriptional activity of Pol III is tightly controlled and its dysregulation is associated with human diseases, such as cancer. Human Pol III has two isoforms with difference only in one of its subunits RPC7 (α and β) ...

    RNA polymerase III (Pol III) transcribes essential structured small RNAs, such as tRNAs, 5S rRNA and U6 snRNA. The transcriptional activity of Pol III is tightly controlled and its dysregulation is associated with human diseases, such as cancer. Human Pol III has two isoforms with difference only in one of its subunits RPC7 (α and β). Despite structural studies of yeast Pol III, structure of human Pol III remains unsolved. Here, we determined the structures of 17-subunit human Pol IIIα complex in the backtracked and post-translocation states, respectively. Human Pol III contains a generally conserved catalytic core, similar to that of yeast counterpart, and structurally unique RPC3-RPC6-RPC7 heterotrimer and RPC10. The N-ribbon of TFIIS-like RPC10 docks on the RPC4-RPC5 heterodimer and the C-ribbon inserts into the funnel of Pol III in the backtracked state but is more flexible in the post-translocation state. RPC7 threads through the heterotrimer and bridges the stalk and Pol III core module. The winged helix 1 domain of RPC6 and the N-terminal region of RPC7α stabilize each other and may prevent Maf1-mediated repression of Pol III activity. The C-terminal FeS cluster of RPC6 coordinates a network of interactions that mediate core-heterotrimer contacts and stabilize Pol III. Our structural analysis sheds new light on the molecular mechanism of human Pol IIIα-specific transcriptional regulation and provides explanations for upregulated Pol III activity in RPC7α-dominant cancer cells.


    Organizational Affiliation

    State Key Laboratory of Reproductive Regulation and Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, Inner Mongolia, 010070, China. xuyh@fudan.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 RPC8D [auth G]204Homo sapiensMutation(s): 0 
Gene Names: POLR3HKIAA1665RPC8
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC10E [auth I]108Homo sapiensMutation(s): 0 
Gene Names: POLR3KRPC11My010
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC2F [auth K]133Homo sapiensMutation(s): 0 
Gene Names: POLR1D
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC4G [auth L]58Homo sapiensMutation(s): 0 
Gene Names: POLR2K
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Entity ID: 8
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC6H [auth P]316Homo sapiensMutation(s): 0 
Gene Names: POLR3F
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Entity ID: 9
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC1I [auth E]210Homo sapiensMutation(s): 0 
Gene Names: POLR2E
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Entity ID: 10
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC2J [auth F]127Homo sapiensMutation(s): 0 
Gene Names: POLR2FPOLRF
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Entity ID: 11
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC3K [auth H]150Homo sapiensMutation(s): 0 
Gene Names: POLR2H
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Entity ID: 12
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC5L [auth J]67Homo sapiensMutation(s): 0 
Gene Names: POLR2L
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Entity ID: 13
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC3M [auth O]534Homo sapiensMutation(s): 0 
Gene Names: POLR3C
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Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC7N [auth Q]223Homo sapiensMutation(s): 0 
Gene Names: POLR3G
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Entity ID: 15
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC9O [auth D]148Homo sapiensMutation(s): 0 
Gene Names: CRCP
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Entity ID: 16
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC5P [auth M]708Homo sapiensMutation(s): 0 
Gene Names: POLR3EKIAA1452
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Entity ID: 17
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC4Q [auth N]398Homo sapiensMutation(s): 0 
Gene Names: POLR3DBN51BN51T
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  • Entity ID: 18
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(P*TP*CP*GP*TP*CP*TP*GP*AP*TP*CP*TP*CP*GP*GP*AP*A)-3')R [auth X]16Homo sapiens
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    Entity ID: 19
    MoleculeChainsLengthOrganismImage
    DNA (5'-D(P*TP*TP*CP*CP*GP*AP*GP*AP*TP*CP*AP*GP*AP*CP*GP*AP*GP*AP*TP*CP*GP*GP*G)-3')S [auth Y]23Homo sapiens
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    • Entity ID: 20
      MoleculeChainsLengthOrganismImage
      RNA (5'-R(P*CP*CP*CP*GP*AP*U)-3')T [auth R]6Homo sapiens
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      Experimental Data & Validation

      Experimental Data

      • Method: ELECTRON MICROSCOPY
      • Resolution: 3.50 Å
      • Aggregation State: PARTICLE 
      • Reconstruction Method: SINGLE PARTICLE 

      Structure Validation

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      Entry History 

      Deposition Data

      Revision History  (Full details and data files)

      • Version 1.0: 2021-03-17
        Type: Initial release
      • Version 1.1: 2021-07-14
        Changes: Database references