2OUG

Crystal structure of the RfaH transcription factor at 2.1A resolution


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.238 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Structural basis for converting a general transcription factor into an operon-specific virulence regulator.

Belogurov, G.A.Vassylyeva, M.N.Svetlov, V.Klyuyev, S.Grishin, N.V.Vassylyev, D.G.Artsimovitch, I.

(2007) Mol.Cell 26: 117-129

  • DOI: 10.1016/j.molcel.2007.02.021

  • PubMed Abstract: 
  • RfaH, a paralog of the general transcription factor NusG, is recruited to elongating RNA polymerase at specific regulatory sites. The X-ray structure of Escherichia coli RfaH reported here reveals two domains. The N-terminal domain displays high simi ...

    RfaH, a paralog of the general transcription factor NusG, is recruited to elongating RNA polymerase at specific regulatory sites. The X-ray structure of Escherichia coli RfaH reported here reveals two domains. The N-terminal domain displays high similarity to that of NusG. In contrast, the alpha-helical coiled-coil C domain, while retaining sequence similarity, is strikingly different from the beta barrel of NusG. To our knowledge, such an all-beta to all-alpha transition of the entire domain is the most extreme example of protein fold evolution known to date. Both N domains possess a vast hydrophobic cavity that is buried by the C domain in RfaH but is exposed in NusG. We propose that this cavity constitutes the RNA polymerase-binding site, which becomes unmasked in RfaH only upon sequence-specific binding to the nontemplate DNA strand that triggers domain dissociation. Finally, we argue that RfaH binds to the beta' subunit coiled coil, the major target site for the initiation sigma factors.


    Organizational Affiliation

    Department of Microbiology, The Ohio State University, Columbus, OH 43210, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Transcriptional activator rfaH
A, B, C, D
162Escherichia coli (strain K12)Mutation(s): 0 
Gene Names: rfaH (hlyT, sfrB)
Find proteins for P0AFW0 (Escherichia coli (strain K12))
Go to UniProtKB:  P0AFW0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.273 
  • R-Value Work: 0.238 
  • Space Group: P 65
Unit Cell:
Length (Å)Angle (°)
a = 45.149α = 90.00
b = 45.149β = 90.00
c = 600.163γ = 120.00
Software Package:
Software NamePurpose
HKL-2000data scaling
MAR345data collection
CNSrefinement
HKL-2000data reduction
MLPHAREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-05-01
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-18
    Type: Refinement description