5U9Z image
Entry Detail
PDB ID:
5U9Z
Keywords:
Title:
Phosphoglycerol transferase GacH from Streptococcus pyogenes
Biological Source:
Host Organism:
PDB Version:
Deposition Date:
2016-12-18
Release Date:
2017-12-20
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.23
R-Value Work:
0.21
R-Value Observed:
0.21
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:PHOSPHOGLYCEROL TRANSFERASE
Chain IDs:A, B
Chain Length:382
Number of Molecules:2
Biological Source:STREPTOCOCCUS PYOGENES MGAS5005
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET modified residue
Ligand Molecules
Primary Citation
Discovery of glycerol phosphate modification on streptococcal rhamnose polysaccharides.
Nat.Chem.Biol. 15 463 471 (2019)
PMID: 30936502 DOI: 10.1038/s41589-019-0251-4

Abstact

Cell wall glycopolymers on the surface of Gram-positive bacteria are fundamental to bacterial physiology and infection biology. Here we identify gacH, a gene in the Streptococcus pyogenes group A carbohydrate (GAC) biosynthetic cluster, in two independent transposon library screens for its ability to confer resistance to zinc and susceptibility to the bactericidal enzyme human group IIA-secreted phospholipase A2. Subsequent structural and phylogenetic analysis of the GacH extracellular domain revealed that GacH represents an alternative class of glycerol phosphate transferase. We detected the presence of glycerol phosphate in the GAC, as well as the serotype c carbohydrate from Streptococcus mutans, which depended on the presence of the respective gacH homologs. Finally, nuclear magnetic resonance analysis of GAC confirmed that glycerol phosphate is attached to approximately 25% of the GAC N-acetylglucosamine side-chains at the C6 hydroxyl group. This previously unrecognized structural modification impacts host-pathogen interaction and has implications for vaccine design.

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Primary Citation of related structures