The structural basis for T-antigen hydrolysis by Streptococcus pneumoniae: a target for structure-based vaccine design.Caines, M.E., Zhu, H., Vuckovic, M., Willis, L.M., Withers, S.G., Wakarchuk, W.W., Strynadka, N.C.
(2008) J Biol Chem 283: 31279-31283
- PubMed: 18784084
- DOI: https://doi.org/10.1074/jbc.C800150200
- Primary Citation of Related Structures:
- PubMed Abstract:
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.
Department of Biochemistry and Molecular Biology, Centre for Blood Research and Department of Chemistry, University of British Columbia, Vancouver, British Columbia, V6T 1Z3.