Biological Assembly 1  

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: 42.15 kDa 
• Atom Count: 3,071 
• Modelled Residue Count: 346 
• Deposited Residue Count: 376 
• Unique protein chains: 1

 3QS2

Crystal structure of the biofilm forming subunit of the E. coli common pilus: full length domain swapped dimer of EcpA

• PDB DOI: 10.2210/pdb3QS2/pdb

• Classification: CELL ADHESION
• Organism(s): Escherichia coli CFT073
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-02-19 Released: 2012-02-22 
• Deposition Author(s): Garnett, J.A., Matthews, S.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.78 Å
• R-Value Free: 0.220 
• R-Value Work: 0.179 
• R-Value Observed: 0.183 

Literature

Structural insights into the biogenesis and biofilm formation by the Escherichia coli common pilus.

Garnett, J.A., Martinez-Santos, V.I., Saldana, Z., Pape, T., Hawthorne, W., Chan, J., Simpson, P.J., Cota, E., Puente, J.L., Giron, J.A., Matthews, S.

(2012) Proc Natl Acad Sci U S A 109: 3950-3955

• PubMed: 22355107 
• DOI: 10.1073/pnas.1106733109
• Primary Citation of Related Structures:  
  3QS2, 3QS3


• PubMed Abstract: 
  

Bacteria have evolved a variety of mechanisms for developing community-based biofilms. These bacterial aggregates are of clinical importance, as they are a major source of recurrent disease. Bacterial surface fibers (pili) permit adherence to biotic and abiotic substrates, often in a highly specific manner. The Escherichia coli common pilus (ECP) represents a remarkable family of extracellular fibers that are associated with both disease-causing and commensal strains. ECP plays a dual role in early-stage biofilm development and host cell recognition. Despite being the most common fimbrial structure, relatively little is known regarding its biogenesis, architecture, and function. Here we report atomic-resolution insight into the biogenesis and architecture of ECP. We also derive a structural model for entwined ECP fibers that not only illuminates interbacteria communication during biofilm formation but also provides a useful foundation for the design of novel nanofibers.

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Organizational Affiliation: 

Centre for Structural Biology, Department of Biological Sciences, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Fimbrillin matB homolog	A, B	188	Escherichia coli CFT073	Mutation(s): 0  Gene Names: matB, ecpA, c0404
UniProt
Find proteins for Q8CWB9 (Escherichia coli O6:H1 (strain CFT073 / ATCC 700928 / UPEC)) Explore Q8CWB9  Go to UniProtKB:  Q8CWB9

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
IOD	C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth B], O [auth B], P [auth B], Q [auth B], R [auth B], S [auth B], T [auth B], U [auth B], V [auth B], W [auth B]	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.78 Å
• R-Value Free: 0.220 
• R-Value Work: 0.179 
• R-Value Observed: 0.183 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 46.86	α = 90
b = 72.08	β = 90
c = 108.32	γ = 90

Software Package:

Software Name	Purpose
ADSC	data collection
SHARP	phasing
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2012-02-22 
Deposition Author(s): Garnett, J.A., Matthews, S.J.

Revision History  

• Version 1.0: 2012-02-22
  Type: Initial release
  
• Version 1.1: 2012-03-07
  Changes: Database references
• Version 1.2: 2012-03-21
  Changes: Database references