5FRF

Solution structure of reduced and zinc-bound RsrA


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

wwPDB Validation 3D Report Full Report


This is version 2.0 of the entry. See complete history

Literature

The Anti-Sigma Factor Rsra Responds to Oxidative Stress by Reburying its Hydrophobic Core.

Rajasekar, K.V.Zdanowski, K.Yan, J.Hopper, J.T.Francis, M.L.Seepersad, C.Sharp, C.Pecqueur, L.Werner, J.M.Robinson, C.V.Mohammed, S.Potts, J.R.Kleanthous, C.

(2016) Nat.Commun. 7: 12194

  • DOI: 10.1038/ncomms12194
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • Redox-regulated effector systems that counteract oxidative stress are essential for all forms of life. Here we uncover a new paradigm for sensing oxidative stress centred on the hydrophobic core of a sensor protein. RsrA is an archetypal zinc-binding ...

    Redox-regulated effector systems that counteract oxidative stress are essential for all forms of life. Here we uncover a new paradigm for sensing oxidative stress centred on the hydrophobic core of a sensor protein. RsrA is an archetypal zinc-binding anti-sigma factor that responds to disulfide stress in the cytoplasm of Actinobacteria. We show that RsrA utilizes its hydrophobic core to bind the sigma factor σ(R) preventing its association with RNA polymerase, and that zinc plays a central role in maintaining this high-affinity complex. Oxidation of RsrA is limited by the rate of zinc release, which weakens the RsrA-σ(R) complex by accelerating its dissociation. The subsequent trigger disulfide, formed between specific combinations of RsrA's three zinc-binding cysteines, precipitates structural collapse to a compact state where all σ(R)-binding residues are sequestered back into its hydrophobic core, releasing σ(R) to activate transcription of anti-oxidant genes.


    Organizational Affiliation

    Department of Biochemistry, University of Oxford, South Parks Road, Oxford OX1 3QU, UK.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ANTI-SIGMA FACTOR RSRA
A
108Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145)Mutation(s): 5 
Gene Names: rsrA
Find proteins for Q7AKG8 (Streptomyces coelicolor (strain ATCC BAA-471 / A3(2) / M145))
Go to UniProtKB:  Q7AKG8
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download SDF File 
Download CCD File 
A
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 10 
  • Selection Criteria: LEAST RESTRAINT VIOLATION 

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2016-08-03
    Type: Initial release
  • Version 2.0: 2019-10-23
    Type: Atomic model, Data collection, Other