A Mechanism for Reductive Amination Catalyzed by Fungal Reductive Aminases

Research output: Contribution to journalArticle

  • External authors:
  • Mahima Sharma
  • Juan Mangas-Sanchez
  • Scott P. France
  • Godwin A. Aleku
  • Sarah L. Montgomery
  • Jeremy I. Ramsden
  • Gideon Grogan

Abstract

Reductive aminases (RedAms) catalyze the asymmetric reductive amination of ketones with primary amines to give secondary amine products. RedAms have great potential for the synthesis of bioactive chiral amines; however, insights into their mechanism are currently limited. Comparative studies on reductive amination of cyclohexanone with allylamine in the presence of RedAms, imine reductases (IREDs), or NaBH3CN support the distinctive activity of RedAms in catalyzing both imine formation and reduction in the reaction. Structures of AtRedAm from Aspergillus terreus, in complex with NADPH and ketone and amine substrates, along with kinetic analysis of active-site mutants, reveal modes of substrate binding, the basis for the specificity of RedAms for reduction of imines over ketones, and the importance of domain flexibility in bringing the reactive participants together for the reaction. This information is used to propose a mechanism for their action and also to expand the substrate specificity of RedAms using protein engineering.

Bibliographical metadata

Original languageEnglish
Pages (from-to)11534-11541
Number of pages8
JournalACS Catalysis
Volume8
Issue number12
Early online date26 Oct 2018
DOIs
Publication statusPublished - 7 Dec 2018