Structure of WzzE Polysaccharide Co-polymerase

Experimental Data Snapshot

  • Resolution: 5.99 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 

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Quaternary structure of WzzB and WzzE polysaccharide copolymerases.

Kalynych, S.Cherney, M.Bostina, M.Rouiller, I.Cygler, M.

(2015) Protein Sci 24: 58-69

  • DOI: https://doi.org/10.1002/pro.2586
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bacteria have evolved cellular control mechanisms to ensure proper length specification for surface-bound polysaccharides. Members of the Polysaccharide Copolymerase (PCP) family are central to this process. PCP-1 family members are anchored to the inner membrane through two transmembrane helices and contain a large periplasm-exposed domain. PCPs are known to form homooligomers but their exact stoichiometry is controversial in view of conflicting structural and biochemical data. Several prior investigations addressing this question indicated a nonameric, hexameric, or tetrameric organization of several PCP-1 family members. In this work, we gathered additional evidence that E.coli WzzB and WzzE PCPs form octameric homo-oligomeric complexes. Detergent-solubilized PCPs were purified to homogeneity and subjected to blue native gel analysis, which indicated the presence of a predominant high-molecular product of over 500 kDa in mass. Molecular mass of WzzE and WzzB-detergent oligomers was estimated to be 550 kDA by size-exclusion coupled to multiangle laser light scattering (SEC-MALLS). Oligomeric organization of purified WzzB and WzzE was further investigated by negative stain electron microscopy and by X-ray crystallography, respectively. Analysis of EM-derived molecular envelope of WzzB indicated that the full-length protein is composed of eight protomers. Crystal structure of LDAO-solubilized WzzE was solved to 6 Å resolutions and revealed its octameric subunit stoichiometry. In summary, we identified a possible biological unit utilized for the glycan chain length determination by two PCP-1 family members. This provides an important step toward further unraveling of the mechanistic basis of chain length control of the O-antigen and the enterobacterial common antigen.

  • Organizational Affiliation

    Department of Biochemistry, McGill University, Montreal, Quebec, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Lipopolysaccharide biosynthesis protein WzzE356Escherichia coli O157:H7Mutation(s): 0 
Gene Names: wzzEwzzZ5296ECs4718
Find proteins for P0AG01 (Escherichia coli O157:H7)
Explore P0AG01 
Go to UniProtKB:  P0AG01
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP0AG01
Sequence Annotations
  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Resolution: 5.99 Å
  • R-Value Free: 0.245 
  • R-Value Work: 0.234 
  • R-Value Observed: 0.237 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 276.849α = 90
b = 246.306β = 89.99
c = 133.201γ = 90
Software Package:
Software NamePurpose

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2014-10-29
    Type: Initial release
  • Version 1.1: 2015-01-07
    Changes: Database references
  • Version 1.2: 2017-08-09
    Changes: Database references, Derived calculations, Other, Source and taxonomy, Structure summary
  • Version 1.3: 2023-09-27
    Changes: Data collection, Database references, Refinement description