6EU2

Apo RNA Polymerase III - open conformation (oPOL3)


Experimental Data Snapshot

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 

wwPDB Validation   3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Structural basis of RNA polymerase III transcription initiation.

Abascal-Palacios, G.Ramsay, E.P.Beuron, F.Morris, E.Vannini, A.

(2018) Nature 553: 301-306

  • DOI: https://doi.org/10.1038/nature25441
  • Primary Citation of Related Structures:  
    6EU0, 6EU1, 6EU2, 6EU3

  • PubMed Abstract: 

    RNA polymerase (Pol) III transcribes essential non-coding RNAs, including the entire pool of transfer RNAs, the 5S ribosomal RNA and the U6 spliceosomal RNA, and is often deregulated in cancer cells. The initiation of gene transcription by Pol III requires the activity of the transcription factor TFIIIB to form a transcriptionally active Pol III preinitiation complex (PIC). Here we present electron microscopy reconstructions of Pol III PICs at 3.4-4.0 Å and a reconstruction of unbound apo-Pol III at 3.1 Å. TFIIIB fully encircles the DNA and restructures Pol III. In particular, binding of the TFIIIB subunit Bdp1 rearranges the Pol III-specific subunits C37 and C34, thereby promoting DNA opening. The unwound DNA directly contacts both sides of the Pol III cleft. Topologically, the Pol III PIC resembles the Pol II PIC, whereas the Pol I PIC is more divergent. The structures presented unravel the molecular mechanisms underlying the first steps of Pol III transcription and also the general conserved mechanisms of gene transcription initiation.


  • Organizational Affiliation

    The Institute of Cancer Research, London SW7 3RP, UK.


Macromolecules
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Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC11,460Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 2.7.7.6
UniProt
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Entity ID: 2
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC21,149Saccharomyces cerevisiae S288CMutation(s): 0 
EC: 2.7.7.6
UniProt
Find proteins for P22276 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 3
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC1335Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 4
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC9161Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P47076 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 5
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC1215Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P20434 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 6
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC2155Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 7
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC8212Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 8
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC3146Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 9
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC10110Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 10
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC570Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P22139 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 11
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I and III subunit RPAC2142Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
Find proteins for P28000 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
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Entity ID: 12
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerases I, II, and III subunit RPABC470Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 13
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC5282Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 14
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC4422Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 15
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC3654Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 16
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC6317Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Entity ID: 17
MoleculeChains Sequence LengthOrganismDetailsImage
DNA-directed RNA polymerase III subunit RPC7251Saccharomyces cerevisiae S288CMutation(s): 0 
UniProt
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Experimental Data & Validation

Experimental Data

  • Method: ELECTRON MICROSCOPY
  • Resolution: 3.40 Å
  • Aggregation State: PARTICLE 
  • Reconstruction Method: SINGLE PARTICLE 
EM Software:
TaskSoftware PackageVersion
MODEL REFINEMENTPHENIX1.12-2829
RECONSTRUCTIONRELION2.0.2

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Biotechnology and Biological Sciences Research CouncilUnited KingdomBB/K014390/1
Cancer Research UK Programme FoundationUnited KingdomCR-UK C47547/A21536
Wellcome TrustUnited Kingdom200818/Z/16/Z
Marie Sklodowska-Curie Intra-European FellowshipUnited Kingdom655238

Revision History  (Full details and data files)

  • Version 1.0: 2018-01-17
    Type: Initial release
  • Version 1.1: 2018-01-31
    Changes: Author supporting evidence, Database references
  • Version 1.2: 2019-12-11
    Changes: Other