Engineered C-N Lyase: Enantioselective Synthesis of Chiral Synthons for Artificial Dipeptide Sweeteners.Zhang, J., Grandi, E., Fu, H., Saravanan, T., Bothof, L., Tepper, P.G., Thunnissen, A.W.H., Poelarends, G.J.
(2020) Angew.Chem.Int.Ed.Engl. 59: 429-435
- PubMed: 31625664
- DOI: 10.1002/anie.201910704
- Primary Citation of Related Structures:
- PubMed Abstract:
Aspartic acid derivatives with branched N -alkyl or N -arylalkyl substituents are valuable precursors to artificial dipeptide sweeteners such as neotame and advantame, which have wide-ranging applications in the food industry. Despite the potential a ...
Aspartic acid derivatives with branched N -alkyl or N -arylalkyl substituents are valuable precursors to artificial dipeptide sweeteners such as neotame and advantame, which have wide-ranging applications in the food industry. Despite the potential applications of these amino acid precursors to aspartame-based sweeteners, the development of a biocatalyst to synthesize these compounds in a single asymmetric step is an as yet unmet challenge. Herein we report an enantioselective biocatalytic synthesis of various difficult N -substituted aspartic acids including N -(3,3-dimethylbutyl)-L-aspartic acid and N -[3-(3-hydroxy-4-methoxyphenyl)propyl]-L-aspartic acid, precursors to neotame and advantame respectively, using an engineered variant of ethylenediamine- N , N '-disuccinic acid (EDDS) lyase from Chelativorans sp. BNC1. This engineered C-N lyase (mutant D290M/Y320M) displayed a remarkable 1140-fold increase in activity for the selective hydroamination of fumarate compared to that of the wild-type enzyme, which could be rationalized from the analysis of crystal structures. These results open up new opportunities to develop practical multienzymatic processes for the more sustainable and step-economic synthesis of an important class of food additives.
University of Groningen, Pharmaceutical Biology, Antonius Deusinglaan 1, 9713 AV, Groningen, NETHERLANDS.,NETHERLANDS.