7AE3

Cryo-EM structure of human RNA Polymerase III elongation complex 3

Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 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

Cryo-EM structures of human RNA polymerase III in its unbound and transcribing states.

Girbig, M., Misiaszek, A.D., Vorlander, M.K., Lafita, A., Grotsch, H., Baudin, F., Bateman, A., Muller, C.W.

(2021) Nat Struct Mol Biol 28: 210-219

  • DOI: 10.1038/s41594-020-00555-5
  • Primary Citation of Related Structures:  
    7A6H, 7AE1, 7AE3, 7AEA

  • PubMed Abstract: 

    • RNA polymerase III (Pol III) synthesizes transfer RNAs and other short, essential RNAs. Human Pol III misregulation is linked to tumor transformation, neurodegenerative and developmental disorders, and increased sensitivity to viral infections. Here, we present cryo-electron microscopy structures at 2 ...

    RNA polymerase III (Pol III) synthesizes transfer RNAs and other short, essential RNAs. Human Pol III misregulation is linked to tumor transformation, neurodegenerative and developmental disorders, and increased sensitivity to viral infections. Here, we present cryo-electron microscopy structures at 2.8 to 3.3 Å resolution of transcribing and unbound human Pol III. We observe insertion of the TFIIS-like subunit RPC10 into the polymerase funnel, providing insights into how RPC10 triggers transcription termination. Our structures resolve elements absent from Saccharomyces cerevisiae Pol III such as the winged-helix domains of RPC5 and an iron-sulfur cluster, which tethers the heterotrimer subcomplex to the core. The cancer-associated RPC7α isoform binds the polymerase clamp, potentially interfering with Pol III inhibition by tumor suppressor MAF1, which may explain why overexpressed RPC7α enhances tumor transformation. Finally, the human Pol III structure allows mapping of disease-related mutations and may contribute to the development of inhibitors that selectively target Pol III for therapeutic interventions.

    Organizational Affiliation: 

    European Molecular Biology Laboratory (EMBL), Structural and Computational Biology Unit, Heidelberg, Germany. christoph.mueller@embl.de.



Macromolecules

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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC1A1,390Homo 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 RPC2B1,133Homo 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: POLR1C, POLR1E
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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: POLR2F, POLRF
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC8G204Homo sapiensMutation(s): 0 
Gene Names: POLR3H, KIAA1665, RPC8
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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: POLR3K, RPC11, My010
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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
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DNA-directed RNA polymerase III subunit RPC5M708Homo sapiensMutation(s): 0 
Gene Names: POLR3E, KIAA1452
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Entity ID: 14
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC4N398Homo sapiensMutation(s): 0 
Gene Names: POLR3D, BN51, BN51T
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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
RNAR19synthetic construct
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Entity ID: 19
MoleculeChainsLengthOrganismImage
Non-template DNAS46synthetic construct
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Entity ID: 20
MoleculeChainsLengthOrganismImage
Template DNAT46synthetic construct
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.10 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
RECONSTRUCTIONRELION3.1
MODEL REFINEMENTPHENIX1.13

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2021-02-03
    Type: Initial release
  • Version 1.1: 2021-02-17
    Changes: Database references