Crystal structure of S. aureus TarI in complex with CDP-ribitol (space group P1211)

Experimental Data Snapshot

  • Resolution: 1.80 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 

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This is version 1.2 of the entry. See complete history


Crystallographic analysis of TarI and TarJ, a cytidylyltransferase and reductase pair for CDP-ribitol synthesis in Staphylococcus aureus wall teichoic acid biogenesis.

Li, F.K.K.Gale, R.T.Petrotchenko, E.V.Borchers, C.H.Brown, E.D.Strynadka, N.C.J.

(2021) J Struct Biol 213: 107733-107733

  • DOI: https://doi.org/10.1016/j.jsb.2021.107733
  • Primary Citation of Related Structures:  
    6XH9, 6XHK, 6XHP, 6XHQ, 6XHR, 6XHS, 6XHT

  • PubMed Abstract: 

    The cell wall of many pathogenic Gram-positive bacteria contains ribitol-phosphate wall teichoic acid (WTA), a polymer that is linked to virulence and regulation of essential physiological processes including cell division. CDP-ribitol, the activated precursor for ribitol-phosphate polymerization, is synthesized by a cytidylyltransferase and reductase pair known as TarI and TarJ, respectively. In this study, we present crystal structures of Staphylococcus aureus TarI and TarJ in their apo forms and in complex with substrates and products. The TarI structures illustrate the mechanism of CDP-ribitol synthesis from CTP and ribitol-phosphate and reveal structural changes required for substrate binding and catalysis. Insights into the upstream step of ribulose-phosphate reduction to ribitol-phosphate is provided by the structures of TarJ. Furthermore, we propose a general topology of the enzymes in a heterotetrameric form built using restraints from crosslinking mass spectrometry analysis. Together, our data present molecular details of CDP-ribitol production that may aid in the design of inhibitors against WTA biosynthesis.

  • Organizational Affiliation

    Department of Biochemistry and Molecular Biology and Centre for Blood Research, The University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Ribitol-5-phosphate cytidylyltransferase 1
A, B, C, D, E
A, B, C, D, E, F
261Staphylococcus aureusMutation(s): 0 
Gene Names: tarISAOUHSC_00225
Find proteins for Q2G1C0 (Staphylococcus aureus (strain NCTC 8325 / PS 47))
Explore Q2G1C0 
Go to UniProtKB:  Q2G1C0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ2G1C0
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
V2V (Subject of Investigation/LOI)
Query on V2V

Download Ideal Coordinates CCD File 
I [auth B],
P [auth E]
C14 H25 N3 O15 P2
Query on SCN

Download Ideal Coordinates CCD File 
G [auth A]
H [auth A]
J [auth B]
K [auth B]
L [auth C]
G [auth A],
H [auth A],
J [auth B],
K [auth B],
L [auth C],
M [auth C],
N [auth D],
O [auth D],
Q [auth E],
R [auth F],
S [auth F]
Experimental Data & Validation

Experimental Data

  • Resolution: 1.80 Å
  • R-Value Free: 0.217 
  • R-Value Work: 0.170 
  • R-Value Observed: 0.172 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 49.731α = 90
b = 138.598β = 96.51
c = 109.532γ = 90
Software Package:
Software NamePurpose
PDB_EXTRACTdata extraction
XDSdata reduction
Aimlessdata scaling

Structure Validation

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Ligand Structure Quality Assessment 

Entry History & Funding Information

Deposition Data

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

Revision History  (Full details and data files)

  • Version 1.0: 2021-04-21
    Type: Initial release
  • Version 1.1: 2021-04-28
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Database references, Refinement description