Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 41.64 kDa 
• Atom Count: 3171 
• Modelled Residue Count: 377 
• Deposited Residue Count: 377 
• Unique protein chains: 1

1JMM

Crystal structure of the V-region of Streptococcus mutans antigen I/II

• PDB DOI: 10.2210/pdb1JMM/pdb

• Classification: IMMUNE SYSTEM, MEMBRANE PROTEIN
• Organism(s): Streptococcus mutans
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2001-07-19 Released: 2002-07-17 
• Deposition Author(s): Troffer-Charlier, N., Ogier, J., Moras, D., Cavarelli, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.40 Å
• R-Value Free: 0.234 
• R-Value Work: 0.207 
• R-Value Observed: 0.207 

Literature

Crystal Structure of the V-region of Streptococcus mutans Antigen I/II at 2.4 a Resolution Suggests a Sugar Preformed Binding Site

Troffer-Charlier, N., Ogier, J., Moras, D., Cavarelli, J.

(2002) J Mol Biol 318: 179-188

• PubMed: 12054777 
• DOI: 10.1016/S0022-2836(02)00025-6
• Primary Citation of Related Structures:  
  1JMM


• PubMed Abstract: 
  

Antigens I/II are large multifunctional adhesins from oral viridans streptococci that exert immunomodulatory effects on human cells and play important roles in inflammatory disorders. Among them, Streptococcus mutans plays a major role in the initiation of dental caries. The structure of the V-region (SrV+, residues 464-840) of the antigen I/II of S. mutans has been determined using the multiwavelength anomalous diffraction phasing technique with seleno-methionine-substituted recombinant protein and subsequently refined at 2.4 A resolution. The crystal structure of SrV+ revealed a lectin-like fold that displays a putative preformed carbohydrate-binding site stabilized by a metal ion. Inhibition of this binding site may confer to humans a protection against dental caries and dissemination of the bacteria to extra-oral sites involved in life-threatening inflammatory diseases. This crystal structure constitutes a first step in understanding the structure-function relationship of antigens I/II and may help in delineating new preventive or therapeutic strategies against colonization of the host by oral streptococci.

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Organizational Affiliation: 

Institut National de la Santé et de la Recherche Médicale U424, Faculté de Chirurgie Dentaire, Université Louis Pasteur, 11 rue Humann, 67085 Strasbourg, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
protein I/II V-region	A	377	Streptococcus mutans	Mutation(s): 0  Gene Names: pac
UniProt
Find proteins for P11657 (Streptococcus mutans) Explore P11657  Go to UniProtKB:  P11657

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
NA	B [auth A]	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N

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: 2.40 Å
• R-Value Free: 0.234 
• R-Value Work: 0.207 
• R-Value Observed: 0.207 
• Space Group: P 6₃ 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 124.57	α = 90
b = 124.57	β = 90
c = 147.692	γ = 120

Software Package:

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

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2001-07-19 
• Released Date: 2002-07-17 
Deposition Author(s): Troffer-Charlier, N., Ogier, J., Moras, D., Cavarelli, J.

Revision History  

• Version 1.0: 2002-07-17
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance