Subcellular location of two enzymes involved in the synthesis of phosphorylated recognition markers in lysosomal enzymes.

Abstract

Phosphorylated recognition markers in lysosomal enzyme appear to be synthesized by transfer of alpha-N-acetylglucosamine 1-phosphate groups to C6 hydroxyl of mannose residues in glycosylated enzyme precursors and a subsequent hydrolysis from the diester groups of the N-acetylglucosamine residues. The transfer and the diesterase activities were studied in subcellular fractions of rat liver. Both activities fractionated like the Golgi marker galactosyltransferase.