Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | 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: 53.46 kDa 
• Atom Count: 4003 
• Modelled Residue Count: 459 
• Deposited Residue Count: 474 
• Unique protein chains: 1

2HXW

Crystal Structure of Peb3 from Campylobacter jejuni

• PDB DOI: 10.2210/pdb2HXW/pdb

• Classification: periplasmic binding protein
• Organism(s): Campylobacter jejuni
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2006-08-04 Released: 2007-05-01 
• Deposition Author(s): Rangarajan, E.S., Bhatia, S., Watson, D.C., Munger, C., Cygler, M., Matte, A., Young, N.M., Montreal-Kingston Bacterial Structural Genomics Initiative (BSGI)

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.212 
• R-Value Work: 0.187 
• R-Value Observed: 0.188 

Literature

Structural context for protein N-glycosylation in bacteria: The structure of PEB3, an adhesin from Campylobacter jejuni.

Rangarajan, E.S., Bhatia, S., Watson, D.C., Munger, C., Cygler, M., Matte, A., Young, N.M.

(2007) Protein Sci 16: 990-995

• PubMed: 17456748 
• DOI: 10.1110/ps.062737507
• Primary Citation of Related Structures:  
  2HXW


• PubMed Abstract: 
  

Campylobacter jejuni is unusual among bacteria in possessing a eukaryotic-like system for N-linked protein glycosylation at Asn residues in sequons of the type Asp/Glu-Xaa-Asn-Xaa-Ser/Thr. However, little is known about the structural context of the glycosylated sequons, limiting the design of novel recombinant glycoproteins. To obtain more information on sequon structure, we have determined the crystal structure of the PEB3 (Cj0289c) dimer. PEB3 has the class II periplasmic-binding protein fold, with each monomer having two domains with a ligand-binding site containing citrate located between them, and overall resembles molybdate- and sulfate-binding proteins. The sequon around Asn90 is located within a surface-exposed loop joining two structural elements. The three key residues are well exposed on the surface; hence, they may be accessible to the PglB oligosaccharyltransferase in the folded state.

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Organizational Affiliation: 

Department of Biochemistry, McGill University, Montreal, Quebec H3G 1Y6, Canada.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Major antigenic peptide PEB3	A, B	237	Campylobacter jejuni	Mutation(s): 1  Gene Names: peb3
UniProt
Find proteins for Q0PBL7 (Campylobacter jejuni subsp. jejuni serotype O:2 (strain ATCC 700819 / NCTC 11168)) Explore Q0PBL7  Go to UniProtKB:  Q0PBL7

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
FLC	C [auth A], D [auth B]	CITRATE ANION C6 H5 O7 KRKNYBCHXYNGOX-UHFFFAOYSA-K

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.212 
• R-Value Work: 0.187 
• R-Value Observed: 0.188 
• Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.472	α = 90
b = 101.672	β = 108.98
c = 59.099	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data collection
HKL-2000	data reduction
HKL-2000	data scaling
SHELXS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-08-04 
• Released Date: 2007-05-01 
Deposition Author(s): Rangarajan, E.S., Bhatia, S., Watson, D.C., Munger, C., Cygler, M., Matte, A., Young, N.M., Montreal-Kingston Bacterial Structural Genomics Initiative (BSGI)

Revision History  

• Version 1.0: 2007-05-01
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance