Crystal structure WlaRD, a sugar 3N-formyl transferase in the presence of dTDP-Fuc3NFo and 5-N-Formyl-THF

Experimental Data Snapshot

  • Resolution: 1.45 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 

Starting Model: experimental
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Structure of a sugar N-formyltransferase from Campylobacter jejuni.

Thoden, J.B.Goneau, M.F.Gilbert, M.Holden, H.M.

(2013) Biochemistry 52: 6114-6126

  • DOI: https://doi.org/10.1021/bi4009006
  • Primary Citation of Related Structures:  
    4LXQ, 4LXT, 4LXU, 4LXX, 4LXY, 4LY0, 4LY3

  • PubMed Abstract: 

    The O-antigens, which are components of the outer membranes of Gram-negative bacteria, are responsible for the wide species variations seen in nature and are thought to play a role in bacterial virulence. They often contain unusual dideoxysugars such as 3,6-dideoxy-3-formamido-d-glucose (Qui3NFo). Here, we describe a structural and functional investigation of the protein C8J_1081 from Campylobacter jejuni 81116, which is involved in the biosynthesis of Qui3NFo. Specifically, the enzyme, hereafter referred to as WlaRD, catalyzes the N-formylation of dTDP-3,6-dideoxy-3-amino-d-glucose (dTDP-Qui3N) using N(10)-formyltetrahydrofolate as the carbon source. For this investigation, seven X-ray structures of WlaRD, in complexes with various dTDP-linked sugars and cofactors, were determined to resolutions of 1.9 Å or better. One of the models, with bound N(10)-formyltetrahydrofolate and dTDP, represents the first glimpse of an N-formyltransferase with its natural cofactor. Another model contains the reaction products, tetrahydrofolate and dTDP-Qui3NFo. In combination, the structures provide snapshots of the WlaRD active site before and after catalysis. On the basis of these structures, three amino acid residues were targeted for study: Asn 94, His 96, and Asp 132. Mutations of any of these residues resulted in a complete loss of enzymatic activity. Given the position of His 96 in the active site, it can be postulated that it functions as the active site base to remove a proton from the sugar amino group as it attacks the carbonyl carbon of the N-10 formyl group of the cofactor. Enzyme assays demonstrate that WlaRD is also capable of utilizing dTDP-3,6-dideoxy-3-amino-d-galactose (dTDP-Fuc3N) as a substrate, albeit at a much reduced catalytic efficiency.

  • Organizational Affiliation

    Department of Biochemistry, University of Wisconsin , Madison, Wisconsin 53706, United States.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
WlaRD, a sugar 3N-formyl transferase
A, B
274Campylobacter jejuni subsp. jejuni 81116Mutation(s): 0 
Gene Names: C8J_1081
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 5 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on FNF

Download Ideal Coordinates CCD File 
F [auth A],
K [auth B]
(2R,3R,4S,5R,6R)-4-(formylamino)-3,5-dihydroxy-6-methyltetrahydro-2H-pyran-2-yl [(2R,3S,5R)-3-hydroxy-5-(5-methyl-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)tetrahydrofuran-2-yl]methyl dihydrogen diphosphate (non-preferred name)
C17 H27 N3 O15 P2
Query on FON

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C [auth A],
H [auth B]
N-{[4-({[(6R)-2-amino-5-formyl-4-oxo-1,4,5,6,7,8-hexahydropteridin-6-yl]methyl}amino)phenyl]carbonyl}-L-glutamic acid
C20 H23 N7 O7
Query on MPO

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D [auth A],
E [auth A],
I [auth B],
J [auth B]
C7 H15 N O4 S
Query on EDO

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L [auth B],
M [auth B],
N [auth B],
O [auth B]
C2 H6 O2
Query on CL

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Experimental Data & Validation

Experimental Data

  • Resolution: 1.45 Å
  • R-Value Free: 0.212 
  • R-Value Work: 0.181 
  • R-Value Observed: 0.183 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.992α = 90
b = 64.825β = 110.6
c = 134.798γ = 90
Software Package:
Software NamePurpose
HKL-3000data collection
HKL-3000data reduction
HKL-3000data scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2013-08-14
    Type: Initial release
  • Version 1.1: 2014-02-05
    Changes: Database references
  • Version 1.2: 2023-09-20
    Changes: Data collection, Database references, Derived calculations, Refinement description