The carbohydrate moiety of aminopeptidase N of rabbit intestinal brush‐border membrane

Abstract

Endoglycosidase F was used to eliminate the N-linked complex glycans from intestinal aminopeptidase N. The glycans which were probably O-linked remaining after the endoglycosidase F treatment exhibited the human blood group A and H determinants expressed in enzymes from A⁺ or A⁻ rabbits, respectively. The molecular mass estimation of the two types of glycans by SDS-polyacrylamide gel electrophoresis and the sugar composition of aminopeptidase from A⁺ and A⁻ rabbits strongly suggested the presence of eight N-linked complex glycans and two O-linked oligosaccharides bearing the human group antigenicity.