2Q1Z

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

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.284 
  • R-Value Observed: 0.286 

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:  
    2Q1Z, 2Z2S

  • 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 ChrR ...

    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: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
RpoE, ECF SigEA, C184Rhodobacter sphaeroides 2.4.1Mutation(s): 0 
Gene Names: rpoE, RHOS4_27100, RSP_1092
Find proteins for Q3IYV6 (Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158))
Explore Q3IYV6 
Go to UniProtKB:  Q3IYV6
Protein Feature View
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  • Reference Sequence
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Anti-Sigma factor ChrR, transcriptional activator ChrRB, D195Rhodobacter sphaeroides 2.4.1Mutation(s): 0 
Gene Names: chrR, RHOS4_27110, RSP_1093
Find proteins for P40685 (Rhodobacter sphaeroides (strain ATCC 17023 / 2.4.1 / NCIB 8253 / DSM 158))
Explore P40685 
Go to UniProtKB:  P40685
Protein Feature View
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  • Reference Sequence
Small Molecules
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.40 Å
  • R-Value Free: 0.329 
  • R-Value Work: 0.284 
  • R-Value Observed: 0.286 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 43.601α = 90
b = 119.64β = 90
c = 280.659γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
HKL-2000data collection
DENZOdata reduction
SCALEPACKdata scaling
SHARPphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History  (Full details and data files)

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