[Endo beta-N-acetylglucosaminidase in human liver].

Endo beta-N-acetylglucosaminidase activity was found in a alpha-L-fucosidase preparation purified from human liver homogenates, using glycopeptides from human parotid glycoprotein as a substrate. An oligosaccharide was purified and after reduction N-acetylglucosaminitol was shown by paper chromatography. Thus, the specificity and the significance of this endoglycosidase in glycoprotein catabolism are discussed.