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Abstract Two major components of pineapple bromelain, purified to electrophoretical homogeneity, appeared to have the same oligosaccharide group consisting of d-glucosamine, d-mannose, d-xylose, and l-fucose in ratios of 2:2:1:1. By exhaustive proteolysis of the bromelains, glycopeptides containing only Asx, Glx, and Ser were obtained. Periodate oxidation, methylation, and glycosidase digestion showed that the oligosaccharide chain has a highly branched structure in which all the neutral sugars are in nonreducing terminal positions and both N-acetyl-d-glucosamine residues occur in internal positions.
Scocca et al. (Mon,) studied this question.
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