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Showing content from https://www.rcsb.org/structure/6EU3 below:

RCSB PDB - 6EU3: Apo RNA Polymerase III

6EU3 | pdb_00006eu3 Apo RNA Polymerase III - closed conformation (cPOL3)

This is version 1.4 of the entry. See complete

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Structural basis of RNA polymerase III transcription initiation.Abascal-Palacios, G.

(2018) Nature 553: 301-306

PubMed: 29345637 Search on PubMed
DOI: https://doi.org/10.1038/nature25441

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.

Macromolecule Content

Total Structure Weight: 694.53 kDa
Atom Count: 38,330
Modelled Residue Count: 4,825
Deposited Residue Count: 6,151
Unique protein chains: 17

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3D Structure

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(by identity cutoff) |

3D Structure

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3D Structure

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Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.30 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software: Task Software Package Version MODEL REFINEMENT PHENIX 1.12-2829 RECONSTRUCTION RELION 2.0.2

Entry History & Funding Information

Deposition Data

Released Date: 2018-01-17

Deposition Author(s):

Funding Organization Location Grant Number Biotechnology and Biological Sciences Research Council United Kingdom BB/K014390/1 Cancer Research UK Programme Foundation United Kingdom CR-UK C47547/A21536 Wellcome Trust United Kingdom 200818/Z/16/Z Marie Sklodowska-Curie Intra-European Fellowship United Kingdom 655238 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: 2019-02-20
Changes: Advisory, Data collection, Derived calculations
Version 1.3: 2019-12-11
Changes: Other
Version 1.4: 2024-05-15
Changes: Data collection, Database references

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