6BT4

Crystal structure of the SLH domain of Sap from Bacillus anthracis in complex with a pyruvylated SCWP unit


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.306 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.185 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Molecular Basis for the Attachment of S-Layer Proteins to the Cell Wall of Bacillus anthracis.

Sychantha, D.Chapman, R.N.Bamford, N.C.Boons, G.J.Howell, P.L.Clarke, A.J.

(2018) Biochemistry 57: 1949-1953

  • DOI: 10.1021/acs.biochem.8b00060

  • PubMed Abstract: 
  • Bacterial surface (S) layers are paracrystalline arrays of protein assembled on the bacterial cell wall that serve as protective barriers and scaffolds for housekeeping enzymes and virulence factors. The attachment of S-layer proteins to the cell wal ...

    Bacterial surface (S) layers are paracrystalline arrays of protein assembled on the bacterial cell wall that serve as protective barriers and scaffolds for housekeeping enzymes and virulence factors. The attachment of S-layer proteins to the cell walls of the Bacillus cereus sensu lato, which includes the pathogen Bacillus anthracis, occurs through noncovalent interactions between their S-layer homology domains and secondary cell wall polysaccharides. To promote these interactions, it is presumed that the terminal N-acetylmannosamine (ManNAc) residues of the secondary cell wall polysaccharides must be ketal-pyruvylated. For a few specific S-layer proteins, the O-acetylation of the penultimate N-acetylglucosamine (GlcNAc) is also required. Herein, we present the X-ray crystal structure of the SLH domain of the major surface array protein Sap from B. anthracis in complex with 4,6- O-ketal-pyruvyl-β-ManNAc-(1,4)-β-GlcNAc-(1,6)-α-GlcN. This structure reveals for the first time that the conserved terminal SCWP unit is the direct ligand for the SLH domain. Furthermore, we identify key binding interactions that account for the requirement of 4,6- O-ketal-puruvlyl-ManNAc while revealing the insignificance of the O-acetylation on the GlcNAc residue for recognition by Sap.


    Organizational Affiliation

    Department of Molecular and Cellular Biology , University of Guelph , Guelph , ON N1G 2X1 , Canada.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
S-layer protein sap
A
202Bacillus anthracisMutation(s): 0 
Gene Names: sap
Find proteins for P49051 (Bacillus anthracis)
Go to UniProtKB:  P49051
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
KPM
Query on KPM

Download SDF File 
Download CCD File 
A
2-(acetylamino)-4-O-{2-(acetylamino)-4,6-O-[(1S)-1-carboxyethylidene]-2-deoxy-beta-D-mannopyranosyl}-2-deoxy-beta-D-glucopyranose
C19 H30 N2 O13
ZDEWQEOMIIQXJL-JRZDJGMASA-N
 Ligand Interaction
SO4
Query on SO4

Download SDF File 
Download CCD File 
A
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.306 Å
  • R-Value Free: 0.218 
  • R-Value Work: 0.185 
  • Space Group: P 41 21 2
Unit Cell:
Length (Å)Angle (°)
a = 76.560α = 90.00
b = 76.560β = 90.00
c = 97.379γ = 90.00
Software Package:
Software NamePurpose
Cootmodel building
XDSdata processing
PHENIXphasing
XDSdata reduction
PHENIXrefinement
XDSdata scaling

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Canadian Institutes of Health ResearchCanadaTGC 114045
Canadian Institutes of Health ResearchCanadaMOP 43998

Revision History 

  • Version 1.0: 2018-03-21
    Type: Initial release
  • Version 1.1: 2018-04-18
    Type: Data collection, Database references