Catalytic and molecular properties of rabbit liver carboxylesterase acting on 1,8-cineole derivatives

Nat Prod Commun. 2012 Sep;7(9):1117-22.

Abstract

Rabbit liver carboxylesterase (rCE) was evaluated as the catalyst for the enantioselective hydrolysis of (+/-)-3-endo-acetyloxy-1 ,8-cineole [(+/-)-4], which yields (1S,3S,4R)-(+)-3-acetyloxy-1,8-cineole [(+)-4] and (1R,3R,4S)-(-)-3-hydroxy-1,8-cineole [(-)-3]. Enantioselective asymmetrization of meso-3,5-diacetoxy-1,8-cineol (5) gives (1S,3S,4R,5R)-(-)-3-acetyloxy-5-hydroxy-1,8-cineole (6), with high enantioselectivity. rCE has been chosen to perform both experiments and molecular modeling simulations. Docking simulations combined with molecular dynamics calculations were used to study rCE-catalyzed enantioselective hydrolysis of cineol derivatives. Both compounds were found to bind with their acetyl groups stabilized by hydrogen bond interactions between their oxygen atoms and Ser221.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Biocatalysis*
  • Carboxylesterase / chemistry
  • Carboxylesterase / metabolism*
  • Cyclohexanols / chemistry*
  • Eucalyptol
  • Hydrolysis
  • Liver / enzymology*
  • Models, Molecular
  • Monoterpenes / chemistry*
  • Rabbits
  • Stereoisomerism

Substances

  • Cyclohexanols
  • Monoterpenes
  • Carboxylesterase
  • Eucalyptol