The Complete Amino Acid Sequences of Both Subunits of the Sweet Protein Monellin

Abstract
The amino acid sequences of both chains of the sweet protein Monellin [Dioscoreophyllum cuminsii] were determined. Since chain separation could not be accomplished easily, cyanogen bromide cleavage at the only methionine residue (in the B-chain) was performed and the 3 products obtained were separated. For the identification of amino acid phenylthiohydantoins, high performance liquid chromatography was employed. Thus 37 out of a total of 44 residues of the A chain and 40 out of a total of 42 residues of the large CNBr fragment of the B chain could be determined after Edman degradation of the polypeptides on an automated sequenator.

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