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 and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 100.43 kDa 
• Atom Count: 7294 
• Modelled Residue Count: 815 
• Deposited Residue Count: 893 
• Unique protein chains: 1

2WW8

Structure of the pilus adhesin (RrgA) from Streptococcus pneumoniae

• PDB DOI: 10.2210/pdb2WW8/pdb

• Classification: CELL ADHESION
• Organism(s): Streptococcus pneumoniae
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2009-10-22 Released: 2010-01-19 
• Deposition Author(s): Izore, T., Contreras-Martel, C., El-Mortaji, L., Manzano, C., Terrasse, R., Vernet, T., Di-Guilmi, A.M., Dessen, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.235 
• R-Value Work: 0.195 
• R-Value Observed: 0.197 

Literature

Structural Basis of Host Cell Recognition by the Pilus Adhesin from Streptococcus Pneumoniae

Izore, T., Contreras-Martel, C., El-Mortaji, L., Manzano, C., Terrasse, R., Vernet, T., Di-Guilmi, A.M., Dessen, A.

(2010) Structure 18: 106

• PubMed: 20152157 
• DOI: 10.1016/j.str.2009.10.019
• Primary Citation of Related Structures:  
  2WW8


• PubMed Abstract: 
  

Pili are fibrous virulence factors associated directly to the bacterial surface that play critical roles in adhesion and recognition of host cell receptors. The human pathogen Streptococcus pneumoniae carries a single pilus-related adhesin (RrgA) that is key for infection establishment and provides protection from bacterial challenge in animal infection models, but details of these roles remain unclear. Here we report the high-resolution crystal structure of RrgA, a 893-residue elongated macromolecule whose fold contains four domains presenting both eukaryotic and prokaryotic origins. RrgA harbors an integrin I collagen-recognition domain decorated with two inserted "arms" that fold into a positively charged cradle, as well as three "stalk-forming" domains. We show by site-specific mutagenesis, mass spectrometry, and thermal shift assays that intradomain isopeptide bonds play key roles in stabilizing RrgA's stalk. The high sequence similarity between RrgA and its homologs in other Gram-positive microorganisms suggests common strategies for ECM recognition and immune evasion.

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Organizational Affiliation: 

Institut de Biologie Structurale Jean-Pierre Ebel, UMR 5075 (CEA, CNRS, UJF), Grenoble, France.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
CELL WALL SURFACE ANCHOR FAMILY PROTEIN	A	893	Streptococcus pneumoniae	Mutation(s): 0
UniProt
Find proteins for A0A0H2UNT6 (Streptococcus pneumoniae serotype 4 (strain ATCC BAA-334 / TIGR4)) Explore A0A0H2UNT6  Go to UniProtKB:  A0A0H2UNT6

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
EPE	E [auth A], F [auth A]	4-(2-HYDROXYETHYL)-1-PIPERAZINE ETHANESULFONIC ACID C8 H18 N2 O4 S JKMHFZQWWAIEOD-UHFFFAOYSA-N
CA	C [auth A], D [auth A]	CALCIUM ION Ca BHPQYMZQTOCNFJ-UHFFFAOYSA-N
MG	B [auth A]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.90 Å
• R-Value Free: 0.235 
• R-Value Work: 0.195 
• R-Value Observed: 0.197 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 51.081	α = 90
b = 82.7	β = 90
c = 299.338	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
XDS	data reduction
XSCALE	data scaling
autoSHARP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2009-10-22 
• Released Date: 2010-01-19 
Deposition Author(s): Izore, T., Contreras-Martel, C., El-Mortaji, L., Manzano, C., Terrasse, R., Vernet, T., Di-Guilmi, A.M., Dessen, A.

Revision History  

• Version 1.0: 2010-01-19
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Advisory, Version format compliance
• Version 1.2: 2013-03-06
  Changes: Data collection