Artificial enzymes combining proteins with proline polymers for asymmetric aldol reactions in water

Ningning Zhang, Zhiyong Sun, Changzhu Wu*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Artificial enzymes, usually created by incorporating one or two abiological catalytic species into protein hosts, are becoming promising tools for biocatalysis. However, they are still far behind natural enzymes due to their limited active sites with low activity and selectivity. Here, we proposed a polymeric approach to generate artificial enzymes by combining proteins with organocatalytic polymers, in which multiple proline organocatalysts are grafted from protein scaffolds via atom-transfer radical polymerization. The resultant artificial polyenzymes, abbreviated as "ArPoly", have similar physicochemical properties as natural enzymes and proved to be effective aldolase mimics for the aqueous asymmetric aldol reaction, in which an optimal ArPoly gave rise to 33% conversion and 94% enantioselectivity. Therefore, we proved the concept of water-soluble proline-based organocatalyst for aqueous asymmetric aldol reactions. This success not only expands the toolbox of asymmetric organocatalysis but also opens other avenues in the field of artificial enzymes where a plethora of proteins/enzymes can be combined with various well-designed organocatalytic polymers for synthetically useful reactions.

Original languageEnglish
JournalACS Catalysis
Volume12
Issue number8
Pages (from-to)4777-4783
DOIs
Publication statusPublished - 15. Apr 2022

Keywords

  • artificial enzyme
  • asymmetric organocatalysis
  • biocatalysis
  • proline catalysis
  • protein-polymer conjugate

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