8DVW

Structure of the Campylobacter concisus glycosyltransferase PglA R203Q


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 

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Literature

Specificity determinants revealed by the structure of glycosyltransferase Campylobacter concisus PglA.

Vuksanovic, N.Clasman, J.R.Imperiali, B.Allen, K.N.

(2024) Protein Sci 33: e4848-e4848

  • DOI: https://doi.org/10.1002/pro.4848
  • Primary Citation of Related Structures:  
    8DQD, 8DVW, 8DVZ

  • PubMed Abstract: 

    In selected Campylobacter species, the biosynthesis of N-linked glycoconjugates via the pgl pathway is essential for pathogenicity and survival. However, most of the membrane-associated GT-B fold glycosyltransferases responsible for diversifying glycans in this pathway have not been structurally characterized which hinders the understanding of the structural factors that govern substrate specificity and prediction of resulting glycan composition. Herein, we report the 1.8 Å resolution structure of Campylobacter concisus PglA, the glycosyltransferase responsible for the transfer of N-acetylgalatosamine (GalNAc) from uridine 5'-diphospho-N-acetylgalactosamine (UDP-GalNAc) to undecaprenyl-diphospho-N,N'-diacetylbacillosamine (UndPP-diNAcBac) in complex with the sugar donor GalNAc. This study identifies distinguishing characteristics that set PglA apart within the GT4 enzyme family. Computational docking of the structure in the membrane in comparison to homologs points to differences in interactions with the membrane-embedded acceptor and the structural analysis of the complex together with bioinformatics and site-directed mutagenesis identifies donor sugar binding motifs. Notably, E113, conserved solely among PglA enzymes, forms a hydrogen bond with the GalNAc C6″-OH. Mutagenesis of E113 reveals activity consistent with this role in substrate binding, rather than stabilization of the oxocarbenium ion transition state, a function sometimes ascribed to the corresponding residue in GT4 homologs. The bioinformatic analyses reveal a substrate-specificity motif, showing that Pro281 in a substrate binding loop of PglA directs configurational preference for GalNAc over GlcNAc. This proline is replaced by a conformationally flexible glycine, even in distant homologs, which favor substrates with the same stereochemistry at C4, such as glucose. The signature loop is conserved across all Campylobacter PglA enzymes, emphasizing its importance in substrate specificity.


  • Organizational Affiliation

    Department of Chemistry, Boston University, Boston, Massachusetts, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
N, N'-diacetylbacillosaminyl-diphospho-undecaprenol alpha-1,3-N-acetylgalactosaminyltransferase377Campylobacter concisusMutation(s): 1 
Gene Names: pglACCON33237_1464
EC: 2.4.1.290
UniProt
Find proteins for A0A0M4SVA9 (Campylobacter concisus)
Explore A0A0M4SVA9 
Go to UniProtKB:  A0A0M4SVA9
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A0M4SVA9
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 1 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
UD2 (Subject of Investigation/LOI)
Query on UD2

Download Ideal Coordinates CCD File 
B [auth A]URIDINE-DIPHOSPHATE-N-ACETYLGALACTOSAMINE
C17 H27 N3 O17 P2
LFTYTUAZOPRMMI-NESSUJCYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.29 Å
  • R-Value Free: 0.232 
  • R-Value Work: 0.201 
  • R-Value Observed: 0.202 
  • Space Group: P 31 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 94.924α = 90
b = 94.924β = 90
c = 101.064γ = 120
Software Package:
Software NamePurpose
PHENIXrefinement
Aimlessdata scaling
PHASERphasing

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 General Medical Sciences (NIH/NIGMS)United StatesR01 GM039334

Revision History  (Full details and data files)

  • Version 1.0: 2024-01-17
    Type: Initial release