3FIP

Crystal structure of Usher PapC translocation pore

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 

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This is version 1.2 of the entry. See complete history. 


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

  • 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 ...

    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.

    Organizational Affiliation: 

    Howard Hughes Medical Institute and Department of Biochemistry, University of Texas Southwestern Medical Center, 6001 Forest Park Road, Dallas, TX 75390, USA. yihua.huang@utsouthwestern.edu



Macromolecules
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(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Outer membrane usher protein papCA, B493Escherichia coliMutation(s): 0 
Gene Names: Escherichia coli Enterobacteriaceae, papC
Membrane protein
Mpstruc		Group: 
TRANSMEMBRANE PROTEINS: BETA-BARREL		Sub Group: 
Beta-Barrel Membrane Proteins: Monomeric/Dimeric		Protein: 
P pilus usher translocation domain, PapC146-637
Find proteins for P07110 (Escherichia coli)
Explore P07110 
Go to UniProtKB:  P07110
Protein Feature View
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  • Reference Sequence
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 = 120.036α = 90
b = 120.036β = 90
c = 354.151γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
SnBphasing
PHENIXrefinement
HKL-3000data reduction
HKL-2000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • 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