3E4B

Crystal structure of AlgK from Pseudomonas fluorescens WCS374r


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.220 
  • R-Value Observed: 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
  • Primary Citation of Related Structures:  
    3E4B

  • 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 alginate ...

    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 Struct Biol Cryst Commun 63: 415

    Organizational Affiliation

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



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
AlgKA, B, C, D452Pseudomonas fluorescensMutation(s): 0 
Gene Names: algK
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.50 Å
  • R-Value Free: 0.280 
  • R-Value Work: 0.220 
  • R-Value Observed: 0.220 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 79.09α = 90
b = 107.82β = 96.97
c = 119.03γ = 90
Software Package:
Software NamePurpose
XSCALEdata scaling
SOLVEphasing
RESOLVEphasing
CNSrefinement
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

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