The hypobranchial mucin of the whelk Buccinum undatum L. Properties of the mucin and of the glycoprotein component

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Abstract
The composition of the hypobranchial mucin from Buccinum undatum is reported. The amino acid composition was determined; aspartic acid and glutamic acid contribute almost 24% of the total amino acids in the mucin. Serine, threonine and alanine, in the proportions 2:1:1 respectively, were detected as N-terminal residues, implying the presence of at least 4 protein chains. A glycoprotein component was isolated by phenol precipitation. The glycoprotein contained 8% of neutral sugars comprising glucose, galac-tose, mannose and fucose, and 4-5% of hexosamine, comprising glucos-amine and galactosamine in equal proportions. A method is described for the preparation of glycopeptides from the glycoprotein. The comparative biochemistry of the mucin is discussed.

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