3ECQ image
Deposition Date 2008-09-01
Release Date 2008-09-09
Last Version Date 2024-10-30
Entry Detail
PDB ID:
3ECQ
Keywords:
Title:
Endo-alpha-N-acetylgalactosaminidase from Streptococcus pneumoniae: SeMet structure
Biological Source:
Source Organism:
Host Organism:
Method Details:
Experimental Method:
Resolution:
2.90 Å
R-Value Free:
0.23
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Endo-alpha-N-acetylgalactosaminidase
Gene (Uniprot):spr0328
Chain IDs:A, B
Chain Length:1531
Number of Molecules:2
Biological Source:Streptococcus pneumoniae
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
MSE A MET SELENOMETHIONINE
Primary Citation
The structural basis for T-antigen hydrolysis by Streptococcus pneumoniae: a target for structure-based vaccine design.
J.Biol.Chem. 283 31279 31283 (2008)
PMID: 18784084 DOI: 10.1074/jbc.C800150200

Abstact

Streptococcus pneumoniae endo-alpha-N-acetylgalactosaminidase is a cell surface-anchored glycoside hydrolase from family GH101 involved in the breakdown of mucin type O-linked glycans. The 189-kDa mature enzyme specifically hydrolyzes the T-antigen disaccharide from extracellular host glycoproteins and is representative of a broadly important class of virulence factors that have remained structurally uncharacterized due to their large size and highly modular nature. Here we report a 2.9 angstroms resolution crystal structure that remarkably captures the multidomain architecture and characterizes a catalytic center unexpectedly resembling that of alpha-amylases. Our analysis presents a complete model of glycoprotein recognition and provides a basis for the structure-based design of novel Streptococcus vaccines and therapeutics.

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Primary Citation of related structures