5UVR

The core region of PilO from the type IV pilus system of Pseudomonas aeruginosa

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.235 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history. 


Literature

Conserved, unstructured regions in Pseudomonas aeruginosa PilO are important for type IVa pilus function.

Leighton, T.L., Mok, M.C., Junop, M.S., Howell, P.L., Burrows, L.L.

(2018) Sci Rep 8: 2600-2600

  • DOI: 10.1038/s41598-018-20925-w
  • Primary Citation of Related Structures:  
    5UVR

  • PubMed Abstract: 

    • Pseudomonas aeruginosa uses long, thin fibres called type IV pili (T4P) for adherence to surfaces, biofilm formation, and twitching motility. A conserved subcomplex of PilMNOP is required for extension and retraction of T4P. To better understand its ...

    Pseudomonas aeruginosa uses long, thin fibres called type IV pili (T4P) for adherence to surfaces, biofilm formation, and twitching motility. A conserved subcomplex of PilMNOP is required for extension and retraction of T4P. To better understand its function, we attempted to co-crystallize the soluble periplasmic portions of PilNOP, using reductive surface methylation to promote crystal formation. Only PilO Δ109 crystallized; its structure was determined to 1.7 Å resolution using molecular replacement. This new structure revealed two novel features: a shorter N-terminal α1-helix followed by a longer unstructured loop, and a discontinuous β-strand in the second αββ motif, mirroring that in the first motif. PISA analysis identified a potential dimer interface with striking similarity to that of the PilO homolog EpsM from the Vibrio cholerae type II secretion system. We identified highly conserved residues within predicted unstructured regions in PilO proteins from various Pseudomonads and performed site-directed mutagenesis to assess their role in T4P function. R169D and I170A substitutions decreased surface piliation and twitching motility without disrupting PilO homodimer formation. These residues could form important protein-protein interactions with PilN or PilP. This work furthers our understanding of residues critical for T4aP function.

    Organizational Affiliation: 

    Department of Biochemistry and Biomedical Sciences and the Michael G. DeGroote Institute for Infectious Disease Research, McMaster University, Hamilton, ON, Canada. burrowl@mcmaster.ca.



Macromolecules
Find similar proteins by: 
(by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
PilO proteinA98Pseudomonas aeruginosaMutation(s): 0 
Gene Names: 
Find proteins for Q51353 (Pseudomonas aeruginosa)
Explore Q51353 
Go to UniProtKB:  Q51353
Protein Feature View
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  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MLY
Query on MLY		AL-PEPTIDE LINKINGC8 H18 N2 O2LYS
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.70 Å
  • R-Value Free: 0.267 
  • R-Value Work: 0.231 
  • R-Value Observed: 0.235 
  • Space Group: P 61 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 40.81α = 90
b = 40.81β = 90
c = 250.47γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
iMOSFLMdata processing
PHENIXphasing
PHENIXmodel building
HKL-2000data scaling

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)CanadaMOP-93585

Revision History 

  • Version 1.0: 2018-02-21
    Type: Initial release
  • Version 1.1: 2020-01-08
    Changes: Author supporting evidence