Biological Assembly 1  

 3D View: Structure | Electron Density

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

Biological assembly 1 assigned by authors and generated by PISA (software)

Biological Assembly 2  

 3D View: Structure | Electron Density

Standalone Viewers  
Protein Workshop | Ligand Explorer

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

Biological assembly 2 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 32078.70 
• Atom Count: 2255 
• Residue Count: 298 
• Unique protein chains: 2

1N12

Crystal structure of the PapE (N-terminal-deleted) pilus subunit bound to a peptide corresponding to the N-terminal extension of the PapK pilus subunit (residues 1-11) from uropathogenic E. coli

• DOI: 10.2210/pdb1N12/pdb

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


• Deposited: 2002-10-16 Released: 2002-12-11 
• Deposition Author(s): Sauer, F.G., Pinkner, J.S., Waksman, G., Hultgren, S.J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.87 Å
• R-Value Free: 0.249 
• R-Value Work: 0.208 

Literature

Chaperone priming of pilus subunits facilitates a topological transition that drives fiber formation

Sauer, F.G., Pinkner, J.S., Waksman, G., Hultgren, S.J.

(2002) Cell 111: 543-551

• PubMed: 12437927 
• Primary Citation of Related Structures:  
  1N0L


• PubMed Abstract: 
  

Periplasmic chaperones direct the assembly of adhesive, multi-subunit pilus fibers that play critical roles in bacterial pathogenesis. Pilus assembly occurs via a donor strand exchange mechanism in which the N-terminal extension of one subunit replaces the chaperone G(1) strand that transiently occupies a groove in the neighboring subunit. Here, we show that the chaperone primes the subunit for assembly by holding the groove in an open, activated conformation. During donor strand exchange, the subunit undergoes a topological transition that triggers the closure of the groove and seals the N-terminal extension in place. It is this topological transition, made possible only by the priming action of the chaperone that drives subunit assembly into the fiber.

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Organizational Affiliation: 

Department of Molecular Microbiology, Washington University Medical School, 660 South Euclid Avenue, St. Louis, MO 63105, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
mature Fimbrial protein PapE	A, C	138	Escherichia coli	Mutation(s): 0  Gene Names: papE
Find proteins for P08407 (Escherichia coli) Go to UniProtKB:  P08407

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details
Peptide corresponding to the N-terminal extension of protein PapK	B, D	11	Escherichia coli	Mutation(s): 0  Gene Names: prsK
Find proteins for P42191 (Escherichia coli) Go to UniProtKB:  P42191

Small Molecules

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

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.87 Å
• R-Value Free: 0.249 
• R-Value Work: 0.208 
• Space Group: P 1 2₁ 1

Unit Cell:

Length (Å)	Angle (°)
a = 25.254	α = 90.00
b = 91.922	β = 99.26
c = 51.244	γ = 90.00

Software Package:

Software Name	Purpose
SCALEPACK	data scaling
HKL-2000	data collection
HKL-2000	data reduction
CNS	refinement
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-10-16 
• Released Date: 2002-12-11 
• Deposition Author(s): Sauer, F.G., Pinkner, J.S., Waksman, G., Hultgren, S.J.

Revision History 

• Version 1.0: 2002-12-11
  Type: Initial release
• Version 1.1: 2008-04-28
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance