2BV6 | pdb_00002bv6

Crystal structure of MgrA, a global regulator and major virulence determinant in Staphylococcus aureus

• PDB DOI: https://doi.org/10.2210/pdb2BV6/pdb

• Classification: TRANSCRIPTIONAL REGULATOR
• Organism(s): Staphylococcus aureus
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2005-06-22 Released: 2006-09-20 
• Deposition Author(s): Chen, P.R., Bae, T., Williams, W.A., Duguid, E.M., Rice, P.A., Schneewind, O., He, C.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free: 
  0.292 (Depositor), 0.289 (DCC) 
• R-Value Work: 
  0.250 (Depositor), 0.243 (DCC) 
• R-Value Observed: 
  0.250 (Depositor) 

Literature

An Oxidation-Sensing Mechanism is Used by the Global Regulator Mgra in Staphylococcus Aureus.

Chen, P.R., Bae, T., Williams, W.A., Duguid, E.M., Rice, P.A., Schneewind, O., He, C.

(2006) Nat Chem Biol 2: 591

• PubMed: 16980961 
• DOI: https://doi.org/10.1038/nchembio820
• Primary Citation Related Structures: 
  2BV6


• PubMed Abstract: 
  

  Staphylococcus aureus is a human pathogen responsible for most wound and hospital-acquired infections. The protein MgrA is both an important virulence determinant during infection and a regulator of antibiotic resistance in S. aureus. The crystal structure of the MgrA homodimer, solved at 2.86 A, indicates the presence of a unique cysteine residue located at the interface of the protein dimer. We discovered that this cysteine residue can be oxidized by various reactive oxygen species, such as hydrogen peroxide and organic hydroperoxide. Cysteine oxidation leads to dissociation of MgrA from DNA and initiation of signaling pathways that turn on antibiotic resistance in S. aureus. The oxidation-sensing mechanism is typically used by bacteria to counter challenges of reactive oxygen and nitrogen species. Our study reveals that in S. aureus, MgrA adopts a similar mechanism but uses it to globally regulate different defensive pathways.

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Organizational Affiliation: 
• Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637, USA.

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 16.63 kDa 
• Atom Count: 1,132 
• Modeled Residue Count: 137 
• Deposited Residue Count: 142 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HTH-TYPE TRANSCRIPTIONAL REGULATOR MGRA	A	142	Staphylococcus aureus	Mutation(s): 0
UniProt
Find proteins for P0C1S0 (Staphylococcus aureus) Explore P0C1S0  Go to UniProtKB:  P0C1S0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.80 Å
• R-Value Free:  0.292 (Depositor), 0.289 (DCC) 
• R-Value Work:  0.250 (Depositor), 0.243 (DCC) 
• R-Value Observed: 0.250 (Depositor) 

Space Group: P 6₁ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 119.8	α = 90
b = 119.8	β = 90
c = 62.3	γ = 120

Software Package:

Software Name	Purpose
CNS	refinement
MOSFLM	data reduction
SCALEPACK	data scaling
SOLVE	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2006-09-20 
Deposition Author(s): Chen, P.R., Bae, T., Williams, W.A., Duguid, E.M., Rice, P.A., Schneewind, O., He, C.

Revision History  

• Version 1.0: 2006-09-20
  Type: Initial release
  
• Version 1.1: 2011-05-08
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2024-11-13
  Changes: Data collection, Database references, Derived calculations, Other, Structure summary