Structure of BpsB deaceylase domain from Bordetella bronchiseptica

Experimental Data Snapshot

  • Resolution: 1.95 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 

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This is version 1.3 of the entry. See complete history


The Protein BpsB Is a Poly-beta-1,6-N-acetyl-d-glucosamine Deacetylase Required for Biofilm Formation in Bordetella bronchiseptica.

Little, D.J.Milek, S.Bamford, N.C.Ganguly, T.DiFrancesco, B.R.Nitz, M.Deora, R.Howell, P.L.

(2015) J Biol Chem 290: 22827-22840

  • DOI: https://doi.org/10.1074/jbc.M115.672469
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Bordetella pertussis and Bordetella bronchiseptica are the causative agents of whooping cough in humans and a variety of respiratory diseases in animals, respectively. Bordetella species produce an exopolysaccharide, known as the Bordetella polysaccharide (Bps), which is encoded by the bpsABCD operon. Bps is required for Bordetella biofilm formation, colonization of the respiratory tract, and confers protection from complement-mediated killing. In this report, we have investigated the role of BpsB in the biosynthesis of Bps and biofilm formation by B. bronchiseptica. BpsB is a two-domain protein that localizes to the periplasm and outer membrane. BpsB displays metal- and length-dependent deacetylation on poly-β-1,6-N-acetyl-d-glucosamine (PNAG) oligomers, supporting previous immunogenic data that suggests Bps is a PNAG polymer. BpsB can use a variety of divalent metal cations for deacetylase activity and showed highest activity in the presence of Ni(2+) and Co(2+). The structure of the BpsB deacetylase domain is similar to the PNAG deacetylases PgaB and IcaB and contains the same circularly permuted family four carbohydrate esterase motifs. Unlike PgaB from Escherichia coli, BpsB is not required for polymer export and has unique structural differences that allow the N-terminal deacetylase domain to be active when purified in isolation from the C-terminal domain. Our enzymatic characterizations highlight the importance of conserved active site residues in PNAG deacetylation and demonstrate that the C-terminal domain is required for maximal deacetylation of longer PNAG oligomers. Furthermore, we show that BpsB is critical for the formation and complex architecture of B. bronchiseptica biofilms.

  • Organizational Affiliation

    From the Program in Molecular Structure and Function, Research Institute, The Hospital for Sick Children, Toronto, Ontario M5G 1X8, the Department of Biochemistry, University of Toronto, Toronto, Ontario M5S 1A8, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BpsB (PgaB), Poly-beta-1,6-N-acetyl-D-glucosamine N-deacetylase
A, B
277Bordetella bronchiseptica RB50Mutation(s): 5 
Gene Names: hmsFBN113_1689BB1768
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on EDO

Download Ideal Coordinates CCD File 
J [auth A]1,2-ETHANEDIOL
C2 H6 O2
Query on NI

Download Ideal Coordinates CCD File 
C [auth A],
D [auth A],
E [auth A],
K [auth B],
L [auth B]
Query on SCN

Download Ideal Coordinates CCD File 
F [auth A],
G [auth A],
H [auth A],
I [auth A],
M [auth B]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.95 Å
  • R-Value Free: 0.208 
  • R-Value Work: 0.169 
  • R-Value Observed: 0.171 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 47.947α = 90
b = 77.785β = 108
c = 76.861γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
Cootmodel building

Structure Validation

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Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Canadian Institutes of Health Research (CIHR)Canada43998

Revision History  (Full details and data files)

  • Version 1.0: 2015-07-29
    Type: Initial release
  • Version 1.1: 2015-09-23
    Changes: Database references
  • Version 1.2: 2020-01-08
    Changes: Author supporting evidence, Database references, Derived calculations
  • Version 1.3: 2023-09-27
    Changes: Data collection, Database references, Derived calculations, Refinement description