3E4B

Crystal structure of AlgK from Pseudomonas fluorescens WCS374r


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.220 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

AlgK is a TPR-containing protein and the periplasmic component of a novel exopolysaccharide secretin.

Keiski, C.L.Harwich, M.Jain, S.Neculai, A.M.Yip, P.Robinson, H.Whitney, J.C.Riley, L.Burrows, L.L.Ohman, D.E.Howell, P.L.

(2010) Structure 18: 265-273

  • DOI: 10.1016/j.str.2009.11.015

  • PubMed Abstract: 
  • The opportunistic pathogen Pseudomonas aeruginosa causes chronic biofilm infections in cystic fibrosis patients. During colonization of the lung, P. aeruginosa converts to a mucoid phenotype characterized by overproduction of the exopolysaccharide al ...

    The opportunistic pathogen Pseudomonas aeruginosa causes chronic biofilm infections in cystic fibrosis patients. During colonization of the lung, P. aeruginosa converts to a mucoid phenotype characterized by overproduction of the exopolysaccharide alginate. Here we show that AlgK, a protein essential for production of high molecular weight alginate, is an outer membrane lipoprotein that contributes to the correct localization of the porin AlgE. Our 2.5 A structure shows AlgK is composed of 9.5 tetratricopeptide-like repeats, and three putative sites of protein-protein interaction have been identified. Bioinformatics analysis suggests that BcsA, PgaA, and PelB, involved in the production and export of cellulose, poly-beta-1,6-N-Acetyl-D-glucosamine, and Pel exopolysaccharide, respectively, share the same topology as AlgK/E. Together, our data suggest that AlgK plays a role in the assembly of the alginate biosynthetic complex and represents the periplasmic component of a new type of outer membrane secretin that differs from canonical bacterial capsular polysaccharide secretion systems.


    Related Citations: 
    • Expression, purification, crystallization and preliminary X-ray analysis of Pseudomonas fluorescens AlgK
      Keiski, C.-L.,Yip, P.,Robinson, H.,Burrows, L.L.,Howell, P.L.
      (2007) Acta Crystallogr.,Sect.F 63: 415


    Organizational Affiliation

    Molecular Structure and Function, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
AlgK
A, B, C, D
452N/AMutation(s): 0 
Protein Feature View is not available: No corresponding UniProt sequence found.
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
CL
Query on CL

Download SDF File 
Download CCD File 
A, B, C
CHLORIDE ION
Cl
VEXZGXHMUGYJMC-UHFFFAOYSA-M
 Ligand Interaction
GOL
Query on GOL

Download SDF File 
Download CCD File 
B, C, D
GLYCEROL
GLYCERIN; PROPANE-1,2,3-TRIOL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.5 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.220 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 79.090α = 90.00
b = 107.820β = 96.97
c = 119.030γ = 90.00
Software Package:
Software NamePurpose
XDSdata reduction
CNSrefinement
PDB_EXTRACTdata extraction
XSCALEdata scaling
RESOLVEphasing
SOLVEphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2009-08-25
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Non-polymer description, Version format compliance