6PCZ

Crystal structure of the bacterial cellulose synthase subunit G (BcsG) catalytic domain from Escherichia coli, selenomethionine variant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.44 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history


Literature

TheEscherichia colicellulose synthase subunit G (BcsG) is a Zn2+-dependent phosphoethanolamine transferase.

Anderson, A.C.Burnett, A.J.N.Hiscock, L.Maly, K.E.Weadge, J.T.

(2020) J Biol Chem 295: 6225-6235

  • DOI: 10.1074/jbc.RA119.011668
  • Structures With Same Primary Citation

  • PubMed Abstract: 
  • Bacterial biofilms are cellular communities that produce an adherent matrix. Exopolysaccharides are key structural components of this matrix and are required for the assembly and architecture of biofilms produced by a wide variety of microorganisms. ...

    Bacterial biofilms are cellular communities that produce an adherent matrix. Exopolysaccharides are key structural components of this matrix and are required for the assembly and architecture of biofilms produced by a wide variety of microorganisms. The human bacterial pathogens Escherichia coli and Salmonella enterica produce a biofilm matrix composed primarily of the exopolysaccharide phosphoethanolamine (pEtN) cellulose. Once thought to be composed of only underivatized cellulose, the pEtN modification present in these matrices has been implicated in the overall architecture and integrity of the biofilm. However, an understanding of the mechanism underlying pEtN derivatization of the cellulose exopolysaccharide remains elusive. The bacterial cellulose synthase subunit G (BcsG) is a predicted inner membrane-localized metalloenzyme that has been proposed to catalyze the transfer of the pEtN group from membrane phospholipids to cellulose. Here we present evidence that the C-terminal domain of BcsG from E. coli ( Ec BcsG ΔN ) functions as a phosphoethanolamine transferase in vitro with substrate preference for cellulosic materials. Structural characterization of Ec BcsG ΔN revealed that it belongs to the alkaline phosphatase superfamily, contains a Zn 2+ ion at its active center, and is structurally similar to characterized enzymes that confer colistin resistance in Gram-negative bacteria. Informed by our structural studies, we present a functional complementation experiment in E. coli AR3110, indicating that the activity of the BcsG C-terminal domain is essential for integrity of the pellicular biofilm. Furthermore, our results established a similar but distinct active-site architecture and catalytic mechanism shared between BcsG and the colistin resistance enzymes.


    Organizational Affiliation

    Department of Biology, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada jweadge@wlu.ca.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Cellulose biosynthesis protein BcsG
A, B
417Escherichia coli K-12Mutation(s): 0 
Gene Names: bcsGyhjUb3538JW3506
Find proteins for P37659 (Escherichia coli (strain K12))
Go to UniProtKB:  P37659
Protein Feature View
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
ZN
Query on ZN

Download CCD File 
A, B
ZINC ION
Zn
PTFCDOFLOPIGGS-UHFFFAOYSA-N
 Ligand Interaction
MG
Query on MG

Download CCD File 
A
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
MSE
Query on MSE
A,BL-PEPTIDE LINKINGC5 H11 N O2 SeMET
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.44 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.196 
  • R-Value Observed: 0.197 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 78.71α = 90
b = 94.58β = 90
c = 105.19γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)Canada630044

Revision History 

  • Version 1.0: 2020-03-18
    Type: Initial release
  • Version 1.1: 2020-05-13
    Changes: Database references