Crystal structure of a peptidoglycan glycosyltransferase from a class A PBP: insight into bacterial cell wall synthesis

Experimental Data Snapshot

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 

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Crystal structure of a peptidoglycan glycosyltransferase suggests a model for processive glycan chain synthesis.

Yuan, Y.Barrett, D.Zhang, Y.Kahne, D.Sliz, P.Walker, S.

(2007) Proc Natl Acad Sci U S A 104: 5348-5353

  • DOI: https://doi.org/10.1073/pnas.0701160104
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 

    Peptidoglycan is an essential polymer that forms a protective shell around bacterial cell membranes. Peptidoglycan biosynthesis is the target of many clinically used antibiotics, including the beta-lactams, imipenems, cephalosporins, and glycopeptides. Resistance to these and other antibiotics has prompted interest in an atomic-level understanding of the enzymes that make peptidoglycan. Representative structures have been reported for most of the enzymes in the pathway. Until now, however, there have been no structures of any peptidoglycan glycosyltransferases (also known as transglycosylases), which catalyze formation of the carbohydrate chains of peptidoglycan from disaccharide subunits on the bacterial cell surface. We report here the 2.1-A crystal structure of the peptidoglycan glycosyltransferase (PGT) domain of Aquifex aeolicus PBP1A. The structure has a different fold from all other glycosyltransferase structures reported to date, but it bears some resemblance to lambda-lysozyme, an enzyme that degrades the carbohydrate chains of peptidoglycan. An analysis of the structure, combined with biochemical information showing that these enzymes are processive, suggests a model for glycan chain polymerization.

  • Organizational Affiliation

    Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02115, USA.

Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Penicillin-binding protein 1A (PBP-1a) (PBP1a)200Aquifex aeolicus VF5Mutation(s): 0 
Gene Names: mrcAponA
EC: 2.4.2
Membrane Entity: Yes 
Find proteins for O66874 (Aquifex aeolicus (strain VF5))
Explore O66874 
Go to UniProtKB:  O66874
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupO66874
Sequence Annotations
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
Query on CPS

Download Ideal Coordinates CCD File 
C32 H58 N2 O7 S
Query on EPE

Download Ideal Coordinates CCD File 
C8 H18 N2 O4 S
Experimental Data & Validation

Experimental Data

  • Resolution: 2.10 Å
  • R-Value Free: 0.244 
  • R-Value Work: 0.218 
  • R-Value Observed: 0.218 
  • Space Group: I 2 2 2
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 54.817α = 90
b = 100.305β = 90
c = 104.012γ = 90
Software Package:
Software NamePurpose
HKL-2000data collection
HKL-2000data reduction
SCALEPACKdata scaling

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2007-03-13
    Type: Initial release
  • Version 1.1: 2008-05-01
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Source and taxonomy, Version format compliance
  • Version 1.3: 2017-10-18
    Changes: Refinement description
  • Version 1.4: 2023-12-27
    Changes: Data collection, Database references, Derived calculations