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The sweet protein monellin consists of two noncovalently associated polypeptide chains, the A chain of 44 amino acid residues and the B chain of 50 residues. The [Asn22, Gln25, Asn26]-A chain, an anologue of the A chain, was synthesized by the stepwise Fmoc-solid-phase method in an overall yield of 13.4%. The synthetic A chain analogue was combined with the [Asn49, Glu50]-B chain, which was left over from a previous work, to give [Asn22, Gln25, Asn26]-A-chain-[Asn49,Glu50]-B-chain-monellin in a yield of 26.2%. This synthetic monellin analogue was approximately 550 times sweeter than sucrose. Changing the carboxyl groups of Asp22, Glu25, and Asp26 of the A chain to amide groups significantly decreased the sweetness potency. Crystallization was performed by a vapor diffusion method.

Solid-phase synthesis and crystallization of (Asn22, Gln25, Asn26)-A-chain-(Asn49, Glu50)-B-chain-monellin, an analogue of the sweet protein monellin.