7ULA

Structure of the Pseudomonas putida AlgKX modification and secretion complex


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 

wwPDB Validation   3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

Structure of the AlgKX modification and secretion complex required for alginate production and biofilm attachment in Pseudomonas aeruginosa.

Gheorghita, A.A.Li, Y.E.Kitova, E.N.Bui, D.T.Pfoh, R.Low, K.E.Whitfield, G.B.Walvoort, M.T.C.Zhang, Q.Codee, J.D.C.Klassen, J.S.Howell, P.L.

(2022) Nat Commun 13: 7631-7631

  • DOI: 10.1038/s41467-022-35131-6
  • Primary Citation of Related Structures:  
    7ULA

  • PubMed Abstract: 
  • Synthase-dependent secretion systems are a conserved mechanism for producing exopolysaccharides in Gram-negative bacteria. Although widely studied, it is not well understood how these systems are organized to coordinate polymer biosynthesis, modification, and export across both membranes and the peptidoglycan ...

    Synthase-dependent secretion systems are a conserved mechanism for producing exopolysaccharides in Gram-negative bacteria. Although widely studied, it is not well understood how these systems are organized to coordinate polymer biosynthesis, modification, and export across both membranes and the peptidoglycan. To investigate how synthase-dependent secretion systems produce polymer at a molecular level, we determined the crystal structure of the AlgK-AlgX (AlgKX) complex involved in Pseudomonas aeruginosa alginate exopolysaccharide acetylation and export. We demonstrate that AlgKX directly binds alginate oligosaccharides and that formation of the complex is vital for polymer production and biofilm attachment. Finally, we propose a structural model for the AlgEKX outer membrane modification and secretion complex. Together, our study provides insight into how alginate biosynthesis proteins coordinate production of a key exopolysaccharide involved in establishing persistent Pseudomonas lung infections.


    Organizational Affiliation

    Department of Biochemistry, University of Toronto, Toronto, ON, Canada. howell@sickkids.ca.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Alginate biosynthesis protein AlgKA [auth B]461Pseudomonas putidaMutation(s): 0 
Gene Names: algKPP_1285
Membrane Entity: Yes 
UniProt
Find proteins for Q88NC7 (Pseudomonas putida (strain ATCC 47054 / DSM 6125 / CFBP 8728 / NCIMB 11950 / KT2440))
Explore Q88NC7 
Go to UniProtKB:  Q88NC7
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ88NC7
Protein Feature View
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  • Reference Sequence
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
Alginate biosynthesis protein AlgXB [auth A]487Pseudomonas putidaMutation(s): 0 
Gene Names: algXPP_1282
EC: 2.3.1
Membrane Entity: Yes 
UniProt
Find proteins for Q88ND0 (Pseudomonas putida (strain ATCC 47054 / DSM 6125 / CFBP 8728 / NCIMB 11950 / KT2440))
Explore Q88ND0 
Go to UniProtKB:  Q88ND0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ88ND0
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.46 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.215 
  • R-Value Observed: 0.217 
  • Space Group: I 4 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 169.95α = 90
b = 169.95β = 90
c = 143.02γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


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

Revision History  (Full details and data files)

  • Version 1.0: 2022-12-14
    Type: Initial release
  • Version 1.1: 2022-12-21
    Changes: Database references