Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

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

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

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 23.87 kDa 
• Atom Count: 1565 
• Modelled Residue Count: 185 
• Deposited Residue Count: 210 
• Unique protein chains: 1

4GGG

Crystal structure of V66A/L68V CzrA in the Zn(II)bound state.

• DOI: 10.2210/pdb4GGG/pdb

• Classification: TRANSCRIPTION regulator
• Organism(s): Staphylococcus aureus subsp. aureus N315
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2012-08-06 Released: 2013-02-06 
• Deposition Author(s): Campanello, G.C., Ma, Z., Grossoehme, N.E., Chakrovorty, D.K., Guerra, A.J., Ye, Y., Dann III, C.E., Merz Jr., K.M., Giedroc, D.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.224 
• R-Value Work: 0.173 
• R-Value Observed: 0.178 

Literature

Allosteric inhibition of a zinc-sensing transcriptional repressor: insights into the arsenic repressor (ArsR) family.

Campanello, G.C., Ma, Z., Grossoehme, N.E., Guerra, A.J., Ward, B.P., Dimarchi, R.D., Ye, Y., Dann, C.E., Giedroc, D.P.

(2013) J Mol Biol 425: 1143-1157

• PubMed: 23353829 
• DOI: 10.1016/j.jmb.2013.01.018
• Primary Citation of Related Structures:  
  4GGG


• PubMed Abstract: 
  

The molecular basis of allosteric regulation remains a subject of intense interest. Staphylococcus aureus CzrA is a member of the ubiquitous arsenic repressor (ArsR) family of bacterial homodimeric metal-sensing proteins and has emerged as a model system for understanding allosteric regulation of operator DNA binding by transition metal ions. Using unnatural amino acid substitution and a standard linkage analysis, we show that a His97' NH(ε2)...O=C His67 quaternary structural hydrogen bond is an energetically significant contributor to the magnitude of the allosteric coupling free energy, ∆Gc. A "cavity" introduced just beneath this hydrogen bond in V66A/L68V CzrA results in a significant reduction in regulation by Zn(II) despite adopting a wild-type global structure and Zn(II) binding and DNA binding affinities only minimally affected from wild type. The energetics of Zn(II) binding and heterotropic coupling free energies (∆Hc, -T∆Sc) of the double mutant are also radically altered and suggest that increased internal dynamics leads to poorer allosteric negative regulation in V66A/L68V CzrA. A statistical coupling analysis of 3000 ArsR proteins reveals a sector that links the DNA-binding determinants and the α5 Zn(II)-sensing sites through V66/L68 in CzrA. We propose that distinct regulatory sites uniquely characteristic of individual ArsR proteins result from evolution of distinct connectivities to this sector, each capable of driving the same biological outcome, transcriptional derepression.

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Organizational Affiliation: 

Department of Chemistry, Indiana University, Bloomington, IN 47405-7102, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Repressor protein	A, B	105	Staphylococcus aureus subsp. aureus N315	Mutation(s): 2  Gene Names: czrA, SA1947
Find proteins for A0A0H3JNF1 (Staphylococcus aureus (strain N315)) Explore A0A0H3JNF1  Go to UniProtKB:  A0A0H3JNF1

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ZN	A, B	ZINC ION Zn PTFCDOFLOPIGGS-UHFFFAOYSA-N
CL	A	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.224 
• R-Value Work: 0.173 
• R-Value Observed: 0.178 
• Space Group: P 2₁ 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.286	α = 90
b = 50.198	β = 90
c = 85.877	γ = 90

Software Package:

Software Name	Purpose
HKL-2000	data collection
PHENIX	model building
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2012-08-06 
• Released Date: 2013-02-06 
Deposition Author(s): Campanello, G.C., Ma, Z., Grossoehme, N.E., Chakrovorty, D.K., Guerra, A.J., Ye, Y., Dann III, C.E., Merz Jr., K.M., Giedroc, D.P.

Revision History  

• Version 1.0: 2013-02-06
  Type: Initial release
  
• Version 1.1: 2013-05-22
  Changes: Database references
• Version 1.2: 2018-01-24
  Changes: Structure summary