Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Predict Membrane 

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

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

Biological Assembly 2  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Predict Membrane 

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

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

Macromolecule Content

• Total Structure Weight: 109.72 kDa 
• Atom Count: 6295 
• Modelled Residue Count: 820 
• Deposited Residue Count: 986 
• Unique protein chains: 1

3FIP

Crystal structure of Usher PapC translocation pore

• PDB DOI: 10.2210/pdb3FIP/pdb

• Classification: TRANSPORT PROTEIN
• Organism(s): Escherichia coli
• Expression System: Escherichia coli
• Mutation(s): No 
• Membrane Protein: Yes  PDBTMMemProtMDmpstruc


• Deposited: 2008-12-12 Released: 2009-09-08 
• Deposition Author(s): Huang, Y., Deisenhofer, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.15 Å
• R-Value Free: 0.359 
• R-Value Work: 0.285 
• R-Value Observed: 0.289 

Literature

Insights into pilus assembly and secretion from the structure and functional characterization of usher PapC.

Huang, Y., Smith, B.S., Chen, L.X., Baxter, R.H., Deisenhofer, J.

(2009) Proc Natl Acad Sci U S A 106: 7403-7407

• PubMed: 19380723 
• DOI: 10.1073/pnas.0902789106
• Primary Citation of Related Structures:  
  3FIP


• PubMed Abstract: 
  

Ushers constitute a family of bacterial outer membrane proteins responsible for the assembly and secretion of surface organelles such as the pilus. The structure at 3.15-A resolution of the usher pyelonephritis-associated pili C (PapC) translocation domain reveals a 24-stranded kidney-shaped beta-barrel, occluded by an internal plug domain. The dimension of the pore allows tandem passage of individual folded pilus subunits in an upright pilus growth orientation, but is insufficient for accommodating donor strand exchange. The molecular packing revealed by the crystal structure shows that 2 PapC molecules in head-to-head orientation interact via exposed beta-strand edges, which could be the preferred dimer interaction in solution. In vitro reconstitution of fiber assemblies suggest that PapC monomers may be sufficient for fiber assembly and secretion; both the plug domain and the C-terminal domain of PapC are required for filament assembly, whereas the N-terminal domain is mainly responsible for recruiting the chaperone-subunit complexes to the usher. The plug domain has a dual function: gating the beta-pore and participating in pilus assembly.

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Organizational Affiliation: 

Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390, USA. [e-mail]

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Outer membrane usher protein papC	A, B	493	Escherichia coli	Mutation(s): 0  Gene Names: Escherichia coli Enterobacteriaceae, papC Membrane Entity: Yes
UniProt
Find proteins for P07110 (Escherichia coli) Explore P07110  Go to UniProtKB:  P07110

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.15 Å
• R-Value Free: 0.359 
• R-Value Work: 0.285 
• R-Value Observed: 0.289 
• Space Group: I 4 2 2

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 120.036	α = 90
b = 120.036	β = 90
c = 354.151	γ = 90

Software Package:

Software Name	Purpose
HKL-3000	data collection
SnB	phasing
PHENIX	refinement
HKL-3000	data reduction
HKL-2000	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2008-12-12 
• Released Date: 2009-09-08 
Deposition Author(s): Huang, Y., Deisenhofer, J.

Revision History  

• Version 1.0: 2009-09-08
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2011-09-28
  Changes: Derived calculations