3FIP

Crystal structure of Usher PapC translocation pore


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.154 Å
  • R-Value Free: 0.359 
  • R-Value Work: 0.285 

wwPDB Validation 3D Report Full Report


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.USA 106: 7403-7407

  • DOI: 10.1073/pnas.0902789106

  • 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 ...

    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

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Outer membrane usher protein papC
A, B
493Escherichia coliMutation(s): 0 
Gene Names: papC
Find proteins for P07110 (Escherichia coli)
Go to UniProtKB:  P07110
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.154 Å
  • R-Value Free: 0.359 
  • R-Value Work: 0.285 
  • Space Group: I 4 2 2
Unit Cell:
Length (Å)Angle (°)
a = 120.036α = 90.00
b = 120.036β = 90.00
c = 354.151γ = 90.00
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-3000data reduction
HKL-2000data scaling
HKL-3000data collection
SnBphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

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