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)

Macromolecule Content

• Total Structure Weight: 21.85 kDa 
• Atom Count: 1648 
• Modelled Residue Count: 164 
• Deposited Residue Count: 188 
• Unique protein chains: 1

3BYP

Mode of Action of a Putative Zinc Transporter CzrB

• DOI: 10.2210/pdb3BYP/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Thermus thermophilus
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2008-01-16 Released: 2008-09-23 
• Deposition Author(s): Cherezov, V., Srinivasan, V., Szebenyi, D.M.E., Caffrey, M.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.224 
• R-Value Work: 0.186 

Literature

Insights into the Mode of Action of a Putative Zinc Transporter CzrB in Thermus thermophilus

Cherezov, V., Hofer, N., Szebenyi, D.M., Kolaj, O., Wall, J.G., Gillilan, R., Srinivasan, V., Jaroniec, C.P., Caffrey, M.

(2008) Structure 16: 1378-1388

• PubMed: 18786400 
• DOI: 10.1016/j.str.2008.05.014
• Primary Citation of Related Structures:  
  3BYR, 3BYP


• PubMed Abstract: 
  

The crystal structures of the cytoplasmic domain of the putative zinc transporter CzrB in the apo and zinc-bound forms reported herein are consistent with the protein functioning in vivo as a homodimer. NMR, X-ray scattering, and size-exclusion chromatography provide support for dimer formation. Full-length variants of CzrB in the apo and zinc-loaded states were generated by homology modeling with the Zn2+/H+ antiporter YiiP. The model suggests a way in which zinc binding to the cytoplasmic fragment creates a docking site to which a metallochaperone can bind for delivery and transport of its zinc cargo. Because the cytoplasmic domain may exist in the cell as an independent, soluble protein, a proposal is advanced that it functions as a metallochaperone and that it regulates the zinc-transporting activity of the full-length protein. The latter requires that zinc binding becomes uncoupled from the creation of a metallochaperone-docking site on CzrB.

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Organizational Affiliation: 

Department of Molecular Biology, The Scripps Research Institute, La Jolla, CA 92037, USA.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CzrB protein	A, B	94	Thermus thermophilus	Mutation(s): 0  Gene Names: czrB
UniProt
Find proteins for Q8VLX7 (Thermus thermophilus) Explore Q8VLX7  Go to UniProtKB:  Q8VLX7

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.70 Å
• R-Value Free: 0.224 
• R-Value Work: 0.186 
• Space Group: P 3₂ 1 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 60.331	α = 90
b = 60.331	β = 90
c = 92.137	γ = 120

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
HKL-2000	data scaling
MOLREP	phasing
ARP/wARP	model building

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-01-16 
• Released Date: 2008-09-23 
Deposition Author(s): Cherezov, V., Srinivasan, V., Szebenyi, D.M.E., Caffrey, M.

Revision History  

• Version 1.0: 2008-09-23
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance