Biological Assembly 1  

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Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 45491.83 
• Atom Count: 2883 
• Residue Count: 412 
• Unique protein chains: 1

1L4I

Crystal Structure of the Periplasmic Chaperone SfaE

• DOI: 10.2210/pdb1L4I/pdb

• Classification: CHAPERONE
• Organism(s): Escherichia coli
• Expression System: Escherichia coli


• Deposited: 2002-03-05 Released: 2002-06-12 
• Deposition Author(s): Knight, S.D., Choudhury, D., Hultgren, S., Pinkner, J., Stojanoff, V., Thompson, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.244 
• R-Value Work: 0.190 

Literature

Structure of the S pilus periplasmic chaperone SfaE at 2.2 A resolution.

Knight, S.D., Choudhury, D., Hultgren, S., Pinkner, J., Stojanoff, V., Thompson, A.

(2002) Acta Crystallogr.,Sect.D 58: 1016-1022

• PubMed: 12037304 


• PubMed Abstract: 
  

S pili are sialic acid binding hair-like appendages expressed by pathogenic strains of Escherichia coli. The presence of S pili has been implicated as a virulence factor in both urinary-tract infections and new-born meningitis. Assembly of S pili proceeds via the ubiquitous chaperone/usher pathway. Previously, structures of the homologous chaperones PapD and FimC involved in assembly of P and type-1 pili, respectively, have been solved. Here, the 2.2 A X-ray structure of the S pilus chaperone SfaE is reported. SfaE has the same overall L-shaped structure as PapD and FimC, with two immunoglobulin-like domains oriented at about a 90 degrees angle to each other. Conserved residues in the subunit-binding cleft known to be critical for chaperone function occupy essentially identical positions in SfaE, FimC and PapD. As in free PapD and FimC, the long F1-G1 loop connecting the two last strands of the N-terminal domain is disordered. SfaE crystallizes as a dimer with an extensive dimer interface involving the subunit-binding surfaces of the chaperone. Dimerization via these regions has previously been observed for PapD and might be a general side effect arising from the subunit-binding properties of periplasmic chaperones. The domain interface contains an extended hydrogen-bond network involving three invariant charged residues and two structurally conserved water molecules. It is suggested that disruption of the domain interactions may destabilize the N-terminal domain through exposure of three conserved hydrophobic residues, thereby promoting release of pilus subunits during pilus assembly.

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Organizational Affiliation: 

Department of Molecular Biology, Uppsala Biomedical Centre, Swedish University of Agricultural Sciences, Box 590, S-753 24 Uppsala, Sweden. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
SfaE PROTEIN	A, B	206	Escherichia coli	Mutation(s): 0  Gene Names: focC
Find proteins for P62609 (Escherichia coli) Go to UniProtKB:  P62609

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.2 Å
• R-Value Free: 0.244 
• R-Value Work: 0.190 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length (Å)	Angle (°)
a = 53.500	α = 90.00
b = 84.240	β = 90.00
c = 97.340	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
SHARP	phasing
REFMAC	refinement
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-03-05 
• Released Date: 2002-06-12 
• Deposition Author(s): Knight, S.D., Choudhury, D., Hultgren, S., Pinkner, J., Stojanoff, V., Thompson, A.

Revision History 

• Version 1.0: 2002-06-12
  Type: Initial release
• Version 1.1: 2008-04-28
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance