Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Cyclic - C2  (3D View)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 33.04 kDa 
• Atom Count: 2273 
• Modelled Residue Count: 265 
• Deposited Residue Count: 280 
• Unique protein chains: 1

3HRM

Crystal structure of Staphylococcus aureus protein SarZ in sulfenic acid form

• DOI: 10.2210/pdb3HRM/pdb

• Classification: TRANSCRIPTION REGULATOR
• Organism(s): Staphylococcus aureus subsp. aureus str. Newman
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2009-06-09 Released: 2009-07-07 
• Deposition Author(s): Poor, C.B., Duguid, E., Rice, P.A., He, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.286 
• R-Value Work: 0.238 

Literature

Crystal structures of the reduced, sulfenic acid, and mixed disulfide forms of SarZ, a redox active global regulator in Staphylococcus aureus.

Poor, C.B., Chen, P.R., Duguid, E., Rice, P.A., He, C.

(2009) J Biol Chem 284: 23517-23524

• PubMed: 19586910 
• DOI: 10.1074/jbc.M109.015826
• Primary Citation of Related Structures:  
  3HRM, 3HSR, 3HSE


• PubMed Abstract: 
  

SarZ is a global transcriptional regulator that uses a single cysteine residue, Cys(13), to sense peroxide stress and control metabolic switching and virulence in Staphylococcus aureus. SarZ belongs to the single-cysteine class of OhrR-MgrA proteins that play key roles in oxidative resistance and virulence regulation in various bacteria. We present the crystal structures of the reduced form, sulfenic acid form, and mixed disulfide form of SarZ. Both the sulfenic acid and mixed disulfide forms are structurally characterized for the first time for this class of proteins. The Cys(13) sulfenic acid modification is stabilized through two hydrogen bonds with surrounding residues, and the overall DNA-binding conformation is retained. A further reaction of the Cys(13) sulfenic acid with an external thiol leads to formation of a mixed disulfide bond, which results in an allosteric change in the DNA-binding domains, disrupting DNA binding. Thus, the crystal structures of SarZ in three different states provide molecular level pictures delineating the mechanism by which this class of redox active regulators undergoes activation. These structures help to understand redox-mediated virulence regulation in S. aureus and activation of the MarR family proteins in general.

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Organizational Affiliation: 

Department of Chemistry, The University of Chicago, Chicago, IL 60637, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HTH-type transcriptional regulator sarZ	A, B	140	Staphylococcus aureus subsp. aureus str. Newman	Mutation(s): 0  Gene Names: NWMN_2286
Find proteins for A0A0H3KA72 (Staphylococcus aureus (strain Newman)) Explore A0A0H3KA72  Go to UniProtKB:  A0A0H3KA72

Small Molecules

Modified Residues  2 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSO	A,B	L-PEPTIDE LINKING	C3 H7 N O3 S		CYS
MSE	A,B	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Free: 0.286 
• R-Value Work: 0.238 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 45.4	α = 90
b = 54.03	β = 90
c = 113.21	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
SOLVE	phasing
CNS	refinement
PDB_EXTRACT	data extraction
HKL-2000	data collection
HKL-2000	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-06-09 
• Released Date: 2009-07-07 
Deposition Author(s): Poor, C.B., Duguid, E., Rice, P.A., He, C.

Revision History  

• Version 1.0: 2009-07-07
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Source and taxonomy, Version format compliance
• Version 1.2: 2017-11-01
  Changes: Refinement description