APO structure of WsaF

Experimental Data Snapshot

  • Resolution: 2.28 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 

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This is version 1.1 of the entry. See complete history


Structural Basis of Substrate Binding in Wsaf, a Rhamnosyltransferase from Geobacillus Stearothermophilus.

Steiner, K.Hagelueken, G.Messner, P.Schaeffer, C.Naismith, J.H.

(2010) J Mol Biol 397: 436

  • DOI: https://doi.org/10.1016/j.jmb.2010.01.035
  • Primary Citation of Related Structures:  
    2X0D, 2X0E, 2X0F

  • PubMed Abstract: 

    Carbohydrate polymers are medically and industrially important. The S-layer of many Gram-positive organisms comprises protein and carbohydrate polymers and forms an almost paracrystalline array on the cell surface. Not only is this array important for the bacteria but it has potential application in the manufacture of commercially important polysaccharides and glycoconjugates as well. The S-layer glycoprotein glycan from Geobacillus stearothermophilus NRS 2004/3a is mainly composed of repeating units of three rhamnose sugars linked by alpha-1,3-, alpha-1,2-, and beta-1,2-linkages. The formation of the beta-1,2-linkage is catalysed by the enzyme WsaF. The rational use of this system is hampered by the fact that WsaF and other enzymes in the pathway share very little homology to other enzymes. We report the structural and biochemical characterisation of WsaF, the first such rhamnosyltransferase to be characterised. Structural work was aided by the surface entropy reduction method. The enzyme has two domains, the N-terminal domain, which binds the acceptor (the growing rhamnan chain), and the C-terminal domain, which binds the substrate (dTDP-beta-l-rhamnose). The structure of WsaF bound to dTDP and dTDP-beta-l-rhamnose coupled to biochemical analysis identifies the residues that underlie catalysis and substrate recognition. We have constructed and tested by site-directed mutagenesis a model for acceptor recognition.

  • Organizational Affiliation

    Centre for Biomolecular Sciences, University of St. Andrews, North Haugh, St. Andrews, Fife KY16 9ST, UK.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
A, B
413Geobacillus stearothermophilusMutation(s): 0 
Find proteins for Q7BG50 (Geobacillus stearothermophilus)
Explore Q7BG50 
Go to UniProtKB:  Q7BG50
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ7BG50
Sequence Annotations
  • Reference Sequence
Small Molecules
Modified Residues  1 Unique
IDChains TypeFormula2D DiagramParent
Query on MSE
A, B
Experimental Data & Validation

Experimental Data

  • Resolution: 2.28 Å
  • R-Value Free: 0.239 
  • R-Value Work: 0.190 
  • R-Value Observed: 0.193 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 75.987α = 90
b = 75.482β = 103.3
c = 78.059γ = 90
Software Package:
Software NamePurpose
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2010-02-02
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Advisory, Refinement description, Version format compliance