Characterization of a glycoprotein in the cyst fluid of Cysticercus tenuicollis from the goat

Dixon S. N., Gibbons R., Parker Janice and Sellwood R. 1973. Characterization of a glycoprotein in the cyst fluid of Cysticercus tenuicollis from the goat. International Journal for Parasitology3:419–424. In the fluids of two tapeworm cysts from goats a prominent periodic acid- Schiff reagent staining protein was found on gel electrophoretograms. In one case serum proteins from the host were also observed. The glycoprotein has been isolated and found to contain about 7·7 per cent heterosaccharide consisting of glucose, galactose, mannose, fucose, neuraminic acid, glucosamine and an unidentified component. The amino acid portion is extremely rich in glutamic acid, aspartic acid, lysine and arginine. Its molecular weight is approximately 90,000. A small degree of heterogeneity was demonstrated by ultra-centrifugal analysis; this may be due to the presence of about 3 per cent of a glycosaminoglycan. In view of the high proportion of charged amino acids it is suggested that this glycoprotein, which appears to be derived from the parasite, functions as the osmotically active macromolecule in the cyst fluid maintaining the turgidity of the cyst.