Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Biological Assembly 2  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

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

Macromolecule Content

• Total Structure Weight: 65.23 kDa 
• Atom Count: 4288 
• Residue Count: 499 
• Unique protein chains: 1

1XT8

Crystal Structure of Cysteine-Binding Protein from Campylobacter jejuni at 2.0 A Resolution

• DOI: 10.2210/pdb1XT8/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Campylobacter jejuni
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2004-10-21 Released: 2005-08-23 
• Deposition Author(s): Muller, A., Thomas, G.H., Horler, R., Brannigan, J.A., Blagova, E., Levdikov, V.M., Fogg, M.J., Wilson, K.S., Wilkinson, A.J., Structural Proteomics in Europe (SPINE)

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.230 
• R-Value Work: 0.177 
• R-Value Observed: 0.180 

Literature

An ATP-binding cassette-type cysteine transporter in Campylobacter jejuni inferred from the structure of an extracytoplasmic solute receptor protein.

Muller, A., Thomas, G.H., Horler, R., Brannigan, J.A., Blagova, E., Levdikov, V.M., Fogg, M.J., Wilson, K.S., Wilkinson, A.J.

(2005) Mol Microbiol 57: 143-155

• PubMed: 15948956 
• DOI: 10.1111/j.1365-2958.2005.04691.x
• Primary Citation of Related Structures:  
  1XT8


• PubMed Abstract: 
  

Campylobacter jejuni is a Gram-negative food-borne pathogen associated with gastroenteritis in humans as well as cases of the autoimmune disease Guillain-Barré syndrome. C. jejuni is asaccharolytic because it lacks an active glycolytic pathway for the use of sugars as a carbon source. This suggests an increased reliance on amino acids as nutrients and indeed the genome sequence of this organism indicates the presence of a number of amino acid uptake systems. Cj0982, also known as CjaA, is a putative extracytoplasmic solute receptor for one such uptake system as well as a major surface antigen and vaccine candidate. The crystal structure of Cj0982 reveals a two-domain protein with density in the enclosed cavity between the domains that clearly defines the presence of a bound cysteine ligand. Fluorescence titration experiments were used to demonstrate that Cj0982 binds cysteine tightly and specifically with a K(d) of approximately 10(-7) M consistent with a role as a receptor for a high-affinity transporter. These data imply that Cj0982 is the binding protein component of an ABC-type cysteine transporter system and that cysteine uptake is important in the physiology of C. jejuni.

---

Organizational Affiliation: 

Structural Biology Laboratory, Department of Chemistry, University of York, York, YO10 5YW, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
putative amino-acid transporter periplasmic solute-binding protein	A, B	292	Campylobacter jejuni	Mutation(s): 1  Gene Names: Cj0982c
Find proteins for Q0P9S0 (Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168)) Explore Q0P9S0  Go to UniProtKB:  Q0P9S0

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
CYS	A	CYSTEINE C3 H7 N O2 S XUJNEKJLAYXESH-REOHCLBHSA-N
GOL	B	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
CYS	Kd :  140   nM  PDBBind
CYS	Kd:  100   nM  Binding MOAD

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.00 Å
• R-Value Free: 0.230 
• R-Value Work: 0.177 
• R-Value Observed: 0.180 
• Space Group: C 1 2 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 93.863	α = 90
b = 88.787	β = 107.81
c = 72.11	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
MOSFLM	data reduction
SCALEPACK	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-10-21 
• Released Date: 2005-08-23 
Deposition Author(s): Muller, A., Thomas, G.H., Horler, R., Brannigan, J.A., Blagova, E., Levdikov, V.M., Fogg, M.J., Wilson, K.S., Wilkinson, A.J., Structural Proteomics in Europe (SPINE)

Revision History 

• Version 1.0: 2005-08-23
  Type: Initial release
  
• Version 1.1: 2008-04-30
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance