pfam12905: Glyco_hydro_101 (This model is not part of the current CDD release)
Endo-alpha-N-acetylgalactosaminidase
Virulence of pathogenic organisms such as the Gram-positive Streptococcus pneumoniae is largely determined by the ability to degrade host glycoproteins and to metabolize the resultant carbohydrates. This family is the enzymatic region, EC:3.2.1.97, of the cell surface proteins that specifically cleave Gal-beta-1,3-GalNAc-alpha-Ser/Thr (T-antigen, galacto-N-biose), the core 1 type O-linked glycan common to mucin glycoproteins. This reaction is exemplified by the S. pneumoniae protein Endo-alpha-N-acetylgalactosaminidase, where Asp764 is the catalytic nucleophile-base and Glu796 the catalytic proton donor.
Jiyao W et al.(2023). "The conserved domain database in 2023.",