Crystal structure of S. aureus TarL N-terminal domain

  • Classification: TRANSFERASE
  • Organism(s): Staphylococcus aureus
  • Expression System: Escherichia coli BL21(DE3)
  • Mutation(s): No 

  • Deposited: 2023-11-26 Released: 2024-04-03 
  • Deposition Author(s): Li, F.K.K., Strynadka, N.C.J.
  • Funding Organization(s): Natural Sciences and Engineering Research Council (NSERC, Canada), Canadian Institutes of Health Research (CIHR), Howard Hughes Medical Institute (HHMI), Canada Research Chairs

Experimental Data Snapshot

  • Resolution: 1.70 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 

wwPDB Validation   3D Report Full Report

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Cryo-EM analysis of S. aureus TarL, a polymerase in wall teichoic acid biogenesis central to virulence and antibiotic resistance.

Li, F.K.K.Worrall, L.J.Gale, R.T.Brown, E.D.Strynadka, N.C.J.

(2024) Sci Adv 10: eadj3864-eadj3864

  • DOI: https://doi.org/10.1126/sciadv.adj3864
  • Primary Citation of Related Structures:  
    8V33, 8V34, 8VA1

  • PubMed Abstract: 

    Wall teichoic acid (WTA), a covalent adduct of Gram-positive bacterial cell wall peptidoglycan, contributes directly to virulence and antibiotic resistance in pathogenic species. Polymerization of the Staphylococcus aureus WTA ribitol-phosphate chain is catalyzed by TarL, a member of the largely uncharacterized TagF-like family of membrane-associated enzymes. We report the cryo-electron microscopy structure of TarL, showing a tetramer that forms an extensive membrane-binding platform of monotopic helices. TarL is composed of an amino-terminal immunoglobulin-like domain and a carboxyl-terminal glycosyltransferase-B domain for ribitol-phosphate polymerization. The active site of the latter is complexed to donor substrate cytidine diphosphate-ribitol, providing mechanistic insights into the catalyzed phosphotransfer reaction. Furthermore, the active site is surrounded by electropositive residues that serve to retain the lipid-linked acceptor for polymerization. Our data advance general insight into the architecture and membrane association of the still poorly characterized monotopic membrane protein class and present molecular details of ribitol-phosphate polymerization that may aid in the design of new antimicrobials.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology, The University of British Columbia, Vancouver, British Columbia, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Teichoic acid ribitol-phosphate polymerase TarL192Staphylococcus aureusMutation(s): 0 
Gene Names: tarL
Find proteins for Q2G1B8 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore Q2G1B8 
Go to UniProtKB:  Q2G1B8
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2G1B8
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on SIN

Download Ideal Coordinates CCD File 
C4 H6 O4
Experimental Data & Validation

Experimental Data

  • Resolution: 1.70 Å
  • R-Value Free: 0.221 
  • R-Value Work: 0.180 
  • R-Value Observed: 0.182 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 69.634α = 90
b = 69.634β = 90
c = 66.59γ = 120
Software Package:
Software NamePurpose
XDSdata reduction
Aimlessdata scaling

Structure Validation

View Full Validation Report

Entry History & Funding Information

Deposition Data

Funding OrganizationLocationGrant Number
Natural Sciences and Engineering Research Council (NSERC, Canada)Canada--
Canadian Institutes of Health Research (CIHR)Canada--
Howard Hughes Medical Institute (HHMI)United States--
Canada Research ChairsCanada--

Revision History  (Full details and data files)

  • Version 1.0: 2024-04-03
    Type: Initial release