2A6E

Crystal structure of the T. Thermophilus RNA polymerase holoenzyme


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.231 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Allosteric modulation of the RNA polymerase catalytic reaction is an essential component of transcription control by rifamycins.

Artsimovitch, I.Vassylyeva, M.N.Svetlov, D.Svetlov, V.Perederina, A.Igarashi, N.Matsugaki, N.Wakatsuki, S.Tahirov, T.H.Vassylyev, D.G.

(2005) Cell 122: 351-363

  • DOI: 10.1016/j.cell.2005.07.014
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Rifamycins, the clinically important antibiotics, target bacterial RNA polymerase (RNAP). A proposed mechanism in which rifamycins sterically block the extension of nascent RNA beyond three nucleotides does not alone explain why certain RNAP mutation ...

    Rifamycins, the clinically important antibiotics, target bacterial RNA polymerase (RNAP). A proposed mechanism in which rifamycins sterically block the extension of nascent RNA beyond three nucleotides does not alone explain why certain RNAP mutations confer resistance to some but not other rifamycins. Here we show that unlike rifampicin and rifapentin, and contradictory to the steric model, rifabutin inhibits formation of the first and second phosphodiester bonds. We report 2.5 A resolution structures of rifabutin and rifapentin complexed with the Thermus thermophilus RNAP holoenzyme. The structures reveal functionally important distinct interactions of antibiotics with the initiation sigma factor. Strikingly, both complexes lack the catalytic Mg2+ ion observed in the apo-holoenzyme, whereas an increase in Mg2+ concentration confers resistance to rifamycins. We propose that a rifamycin-induced signal is transmitted over approximately 19 A to the RNAP active site to slow down catalysis. Based on structural predictions, we designed enzyme substitutions that apparently interrupt this allosteric signal.


    Related Citations: 
    • Structural Basis of Trnascription Inhibition by Antibiotic Streptolydigin
      Temiakov, D., Zenkin, N., Vassylyeva, M.N., Perederina, A., Tahirov, T.H., Kashkina, E., Savkina, M., Zorov, S., Nikiforov, V., Igarashi, N., Matsugaki, N., Wakatsuki, S., Severinov, K., Vassylyev, D.G.
      () To be published --: --

    Organizational Affiliation

    Department of Microbiology, The Ohio State University, 484 West 12th Avenue, Columbus, Ohio 43210, USA.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase beta chain
C, M
1119Thermus thermophilusMutation(s): 0 
EC: 2.7.7.6
Find proteins for Q8RQE9 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q8RQE9

Find similar proteins by: Sequence  |  Structure

Entity ID: 3
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase beta' chain
D, N
1524Thermus thermophilusMutation(s): 0 
EC: 2.7.7.6
Find proteins for Q8RQE8 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q8RQE8

Find similar proteins by: Sequence  |  Structure

Entity ID: 5
MoleculeChainsSequence LengthOrganismDetails
RNA polymerase sigma factor rpoD
F, P
423Thermus thermophilusMutation(s): 0 
Find proteins for Q5SKW1 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SKW1

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
DNA-directed RNA polymerase alpha chain
A, B, K, L
315Thermus thermophilusMutation(s): 0 
EC: 2.7.7.6
Find proteins for Q5SHR6 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SHR6

Find similar proteins by: Sequence  |  Structure

Entity ID: 4
MoleculeChainsSequence LengthOrganismDetails
RNA polymerase omega chain
E, O
99Thermus thermophilusMutation(s): 0 
EC: 2.7.7.6
Find proteins for Q8RQE7 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q8RQE7
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
D, N
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
D, N
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.80 Å
  • R-Value Free: 0.268 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.231 
  • Space Group: P 32
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 239.5α = 90
b = 239.5β = 90
c = 253.1γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
AMoREphasing
CNSrefinement

Structure Validation

View Full Validation Report



Entry History 

Revision History 

  • Version 1.0: 2005-09-20
    Type: Initial release
  • Version 1.1: 2008-04-30
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance