Protein Bodies and Vacuoles as Lysosomes

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Abstract
We have failed to detect the presence of mannose-6-phosphate in the oligosaccharide moiety of glycoproteins from pea (Pisum sativum L. cv Burpeeana) cotyledons using an assay system sensitive to 10 picomoles of mannose-6-phosphate. We were also unable to demonstrate any retention of glycosidase activity from pea seedlings and pea cotyledons on Sepharose-coupled phosphomannosyl receptor proteins isolated from bovine liver which were, however, able to retain phosphomannosylated hexosaminidase purified from Dictyostelium discoideum secretions. Furthermore, although Sepharose-coupled phosphomannosylated hexosaminidase from Dictyostelium was able to bind phosphomannosyl receptors from bovine liver we were unable to detect the retention of any protein from acetone powder extracts of pea seedlings or from endoplasmic reticulum-associated proteins of pea cotyledons.

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