2Q1Z

Crystal Structure of Rhodobacter sphaeroides SigE in complex with the anti-sigma ChrR

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.284 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history. 

Literature

A conserved structural module regulates transcriptional responses to diverse stress signals in bacteria.

Campbell, E.A., Greenwell, R., Anthony, J.R., Wang, S., Lim, L., Das, K., Sofia, H.J., Donohue, T.J., Darst, S.A.

(2007) Mol.Cell 27: 793-805

  • DOI: 10.1016/j.molcel.2007.07.009
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    • A transcriptional response to singlet oxygen in Rhodobacter sphaeroides is controlled by the group IV sigma factor sigma(E) and its cognate anti-sigma ChrR. Crystal structures of the sigma(E)/ChrR complex reveal a modular, two-domain architecture for ...

    A transcriptional response to singlet oxygen in Rhodobacter sphaeroides is controlled by the group IV sigma factor sigma(E) and its cognate anti-sigma ChrR. Crystal structures of the sigma(E)/ChrR complex reveal a modular, two-domain architecture for ChrR. The ChrR N-terminal anti-sigma domain (ASD) binds a Zn(2+) ion, contacts sigma(E), and is sufficient to inhibit sigma(E)-dependent transcription. The ChrR C-terminal domain adopts a cupin fold, can coordinate an additional Zn(2+), and is required for the transcriptional response to singlet oxygen. Structure-based sequence analyses predict that the ASD defines a common structural fold among predicted group IV anti-sigmas. These ASDs are fused to diverse C-terminal domains that are likely involved in responding to specific environmental signals that control the activity of their cognate sigma factor.

    Organizational Affiliation: 

    The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
RpoE, ECF SigE
A, C
184Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158)Mutation(s): 0 
Gene Names: rpoE
Find proteins for Q3IYV6 (Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158))
Go to UniProtKB:  Q3IYV6
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
Anti-Sigma factor ChrR, transcriptional activator ChrR
B, D
195Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158)Mutation(s): 0 
Gene Names: chrR
Find proteins for P40685 (Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158))
Go to UniProtKB:  P40685
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN
Download SDF File 
Download CCD File 
B, D
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.4 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.284 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 43.601α = 90.00
b = 119.640β = 90.00
c = 280.659γ = 90.00
Software Package:
Software NamePurpose
SHARPphasing
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots


View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2007-09-18
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Advisory, Derived calculations, Refinement description, Source and taxonomy, Version format compliance