2O5I

Crystal structure of the T. thermophilus RNA polymerase elongation complex

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 

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


Literature

Structural basis for transcription elongation by bacterial RNA polymerase.

Vassylyev, D.G., Vassylyeva, M.N., Perederina, A., Tahirov, T.H., Artsimovitch, I.

(2007) Nature 448: 157-162

  • DOI: 10.1038/nature05932
  • Primary Citation of Related Structures:  
    2O5I

  • PubMed Abstract: 

    • The RNA polymerase elongation complex (EC) is both highly stable and processive, rapidly extending RNA chains for thousands of nucleotides. Understanding the mechanisms of elongation and its regulation requires detailed information about the structural organization of the EC ...

    The RNA polymerase elongation complex (EC) is both highly stable and processive, rapidly extending RNA chains for thousands of nucleotides. Understanding the mechanisms of elongation and its regulation requires detailed information about the structural organization of the EC. Here we report the 2.5-A resolution structure of the Thermus thermophilus EC; the structure reveals the post-translocated intermediate with the DNA template in the active site available for pairing with the substrate. DNA strand separation occurs one position downstream of the active site, implying that only one substrate at a time can specifically bind to the EC. The upstream edge of the RNA/DNA hybrid stacks on the beta'-subunit 'lid' loop, whereas the first displaced RNA base is trapped within a protein pocket, suggesting a mechanism for RNA displacement. The RNA is threaded through the RNA exit channel, where it adopts a conformation mimicking that of a single strand within a double helix, providing insight into a mechanism for hairpin-dependent pausing and termination.

    Organizational Affiliation: 

    Department of Biochemistry and Molecular Genetics, University of Alabama at Birmingham, Schools of Medicine and Dentistry, 402B Kaul Genetics Building, 720 20th Street South, Birmingham, Alabama 35294, USA. dmitry@uab.edu



Macromolecules

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Entity ID: 4
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase alpha chainG [auth A],
H [auth B],
L [auth K],
M [auth L]		315Thermus thermophilus HB8Mutation(s): 0 
Gene Names: rpoA, TTHA1664
EC: 2.7.7.6
UniProt
Find proteins for Q5SHR6 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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UniProt GroupQ5SHR6
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Entity ID: 5
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase beta chainI [auth C],
N [auth M]		1119Thermus thermophilus HB8Mutation(s): 0 
Gene Names: rpoB, TTHA1813
EC: 2.7.7.6
UniProt
Find proteins for Q8RQE9 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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UniProt GroupQ8RQE9
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Entity ID: 6
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase beta' chainJ [auth D],
O [auth N]		1524Thermus thermophilus HB8Mutation(s): 0 
Gene Names: rpoC, TTHA1812
EC: 2.7.7.6
UniProt
Find proteins for Q8RQE8 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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UniProt GroupQ8RQE8
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Entity ID: 7
MoleculeChainsSequence LengthOrganismDetailsImage
DNA-directed RNA polymerase omega chainK [auth E],
P [auth O]		99Thermus thermophilus HB8Mutation(s): 0 
Gene Names: rpoZ, TTHA1561
EC: 2.7.7.6
UniProt
Find proteins for Q8RQE7 (Thermus thermophilus (strain ATCC 27634 / DSM 579 / HB8))
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UniProt GroupQ8RQE7
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Entity ID: 1
MoleculeChainsLengthOrganismImage
5'-D(P*CP*CP*CP*TP*GP*TP*CP*TP*GP*GP*CP*GP*TP*TP*CP*GP*CP*GP*CP*GP*CP*CP*G)-3'A [auth G],
D [auth X]		23N/A
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Entity ID: 2
MoleculeChainsLengthOrganismImage
5'-R(P*GP*AP*GP*UP*CP*UP*GP*CP*GP*GP*CP*GP*CP*GP*CP*G)-3'B [auth H],
E [auth Y]		16N/A
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Entity ID: 3
MoleculeChainsLengthOrganismImage
5'-D(*AP*AP*CP*GP*CP*CP*AP*GP*AP*CP*AP*GP*GP*G)-3'C [auth I],
F [auth Z]		14N/A
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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.238 
  • R-Value Observed: 0.240 
  • Space Group: P 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 156.211α = 90
b = 156.211β = 90
c = 499.229γ = 90
Software Package:
Software NamePurpose
MAR345dtbdata collection
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-07-03
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance