7MPK

Crystal structure of TagA with UDP-GlcNAc


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.209 

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Literature

Insight into the molecular basis of substrate recognition by the wall teichoic acid glycosyltransferase TagA.

Martinez, O.E.Mahoney, B.J.Goring, A.K.Yi, S.W.Tran, D.P.Cascio, D.Phillips, M.L.Muthana, M.M.Chen, X.Jung, M.E.Loo, J.A.Clubb, R.T.

(2021) J Biol Chem 298: 101464-101464

  • DOI: 10.1016/j.jbc.2021.101464
  • Primary Citation of Related Structures:  
    7MPK, 7N41

  • PubMed Abstract: 
  • Wall teichoic acid (WTA) polymers are covalently affixed to the Gram-positive bacterial cell wall and have important functions in cell elongation, cell morphology, biofilm formation, and β-lactam antibiotic resistance. The first committed step in WTA biosynthesis is catalyzed by the TagA glycosyltransferase (also called TarA), a peripheral membrane protein that produces the conserved linkage unit which joins WTA to the cell wall peptidoglycan ...

    Wall teichoic acid (WTA) polymers are covalently affixed to the Gram-positive bacterial cell wall and have important functions in cell elongation, cell morphology, biofilm formation, and β-lactam antibiotic resistance. The first committed step in WTA biosynthesis is catalyzed by the TagA glycosyltransferase (also called TarA), a peripheral membrane protein that produces the conserved linkage unit which joins WTA to the cell wall peptidoglycan. TagA contains a conserved GT26 core domain followed by a C-terminal polypeptide tail (CTT) that is important for catalysis and membrane binding. Here we report the crystal structure of the Thermoanaerobacter italicus TagA enzyme bound to UDP-ManNAc, revealing the molecular basis of substrate binding. Native mass spectrometry experiments support the model that only monomeric TagA is enzymatically active and that it is stabilized by membrane binding. Molecular dynamics simulations and enzyme activity measurements indicate that the CTT facilitates catalysis by encapsulating the UDP-ManNAc substrate, presenting three highly conserved arginine residues to the active site that are important for catalysis (R214, R221, and R224). From these data we present a mechanistic model of catalysis that ascribes functions for these residues. This work could facilitate the development of new antimicrobial compounds that disrupt WTA biosynthesis in pathogenic bacteria.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, CA, 90095, United States; UCLA-DOE Institute of Genomics and Proteomics, University of California, Los Angeles, Los Angeles, CA, 90095, United States; Molecular Biology Institute, University of California, Los Angeles, Los Angeles, CA, 90095, United States. Electronic address: rclubb@mbi.ucla.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
N-acetylglucosaminyldiphosphoundecaprenol N-acetyl-beta-D-mannosaminyltransferaseA, B, C244Thermoanaerobacter italicus Ab9Mutation(s): 5 
Gene Names: Thit_1850
EC: 2.4.1.187
UniProt
Find proteins for D3T4E0 (Thermoanaerobacter italicus (strain DSM 9252 / Ab9))
Explore D3T4E0 
Go to UniProtKB:  D3T4E0
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD3T4E0
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
UD1 (Subject of Investigation/LOI)
Query on UD1

Download Ideal Coordinates CCD File 
D [auth A],
E [auth B],
F [auth C]
URIDINE-DIPHOSPHATE-N-ACETYLGLUCOSAMINE
C17 H27 N3 O17 P2
LFTYTUAZOPRMMI-CFRASDGPSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.99 Å
  • R-Value Free: 0.257 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.209 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 113.24α = 90
b = 113.24β = 90
c = 114.45γ = 120
Software Package:
Software NamePurpose
BUSTERrefinement
XSCALEdata scaling
PHASERphasing
PDB_EXTRACTdata extraction
XDSdata reduction

Structure Validation

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Ligand Structure Quality Assessment 



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute Of Allergy and Infectious Diseases (NIH/NIAID)United StatesAI52217
Department of Energy (DOE, United States)United StatesDE-FC0 2-02ER63421

Revision History  (Full details and data files)

  • Version 1.0: 2021-12-29
    Type: Initial release
  • Version 1.1: 2022-02-02
    Changes: Database references