This enzyme belongs to the family of hydrolases, specifically those glycosidases that hydrolyse O- and S-glycosyl compounds. The systematic name of this enzyme class is D-galactosyl-3-(N-acetyl-beta-D-galactosaminyl)-L-serine mucinaminohydrolase. Other names in common use include endo-alpha-N-acetylgalactosaminidase, and endo-alpha-N-acetyl-D-galactosaminidase.
Bhavanandan VP, Umemoto J, Davidson EA (1976). "Characterization of an endo-alpha-N-acetyl galactosaminidase from Diplococcus pneumoniae". Biochem. Biophys. Res. Commun. 70 (3): 738–45. PMID7253. doi:10.1016/0006-291X(76)90654-9.
Endo Y, Kobata A (July 1976). "Partial purification and characterization of an endo-alpha-N-acetylgalactosaminidase from the culture of medium of Diplococcus pneumoniae". J. Biochem. Tokyo. 80 (1): 1–8. PMID9374. doi:10.1093/oxfordjournals.jbchem.a131240.
Umemoto J, Bhavanandan VP, Davidson EA (1977). "Purification and properties of an endo-alpha-N-acetyl-D-galactosaminidase from Diplococcus pneumoniae". J. Biol. Chem. 252 (23): 8609–14. PMID21877.