1H38

Structure of a T7 RNA polymerase elongation complex at 2.9A resolution

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.236 

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This is version 1.2 of the entry. See complete history. 

Literature

Structure of a T7 RNA Polymerase Elongation Complex at 2.9 A Resolution

Tahirov, T.H., Temiakov, D., Anikin, M., Patlan, V., Mcallister, W.T., Vassylyev, D.G., Yokoyama, S.

(2002) Nature 420: 43

  • DOI: 10.1038/nature01129

  • PubMed Abstract: 

    • The single-subunit bacteriophage T7 RNA polymerase carries out the transcription cycle in an identical manner to that of bacterial and eukaryotic multisubunit enzymes. Here we report the crystal structure of a T7 RNA polymerase elongation complex, wh ...

    The single-subunit bacteriophage T7 RNA polymerase carries out the transcription cycle in an identical manner to that of bacterial and eukaryotic multisubunit enzymes. Here we report the crystal structure of a T7 RNA polymerase elongation complex, which shows that incorporation of an 8-base-pair RNA-DNA hybrid into the active site of the enzyme induces a marked rearrangement of the amino-terminal domain. This rearrangement involves alternative folding of about 130 residues and a marked reorientation (about 130 degrees rotation) of a stable core subdomain, resulting in a structure that provides elements required for stable transcription elongation. A wide opening on the enzyme surface that is probably an RNA exit pathway is formed, and the RNA-DNA hybrid is completely buried in a newly formed, deep protein cavity. Binding of 10 base pairs of downstream DNA is stabilized mostly by long-distance electrostatic interactions. The structure implies plausible mechanisms for the various phases of the transcription cycle, and reveals important structural similarities with the multisubunit RNA polymerases.

    Organizational Affiliation: 

    High Throughput Factory, RIKEN Harima Institute at SPring-8, 1-1-1 Kouto, Mikazuki-cho, Sayo, Hyogo 679-5148, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure


Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-DIRECTED RNA POLYMERASE
A, B, C, D
883Enterobacteria phage T7Mutation(s): 0 
Find proteins for P00573 (Enterobacteria phage T7)
Go to UniProtKB:  P00573
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*GP*GP*GP*AP*AP*TP*CP*GP*AP*CP *AP*TP*CP*GP*CP*CP*GP*C)-3'E,H,K,N18Enterobacteria phage T7
Entity ID: 3
MoleculeChainsLengthOrganism
5'-R(*AP*AP*CP*UP*GP*CP*GP*GP*CP*GP *AP*U)-3'F,I,L,O12Enterobacteria phage T7
Entity ID: 4
MoleculeChainsLengthOrganism
5'-D(*GP*TP*CP*GP*AP*TP*TP*CP*CP*CP)-3'G,J,M,P10Enterobacteria phage T7
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.9 Å
  • R-Value Free: 0.284 
  • R-Value Work: 0.236 
  • Space Group: P 1
Unit Cell:
Length (Å)Angle (°)
a = 79.907α = 90.36
b = 84.971β = 92.97
c = 202.003γ = 109.94
Software Package:
Software NamePurpose
SCALEPACKdata scaling
CNSrefinement
DENZOdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2002-11-20
    Type: Initial release
  • Version 1.1: 2011-05-08
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance