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Hydroxynitrile lyase catalysis in ionic liquid-containing systems.

Wen-Yong Lou1, Ruo Xu, Min-Hua Zong

  • 1Department of Biotechnology, South China University of Technology, 510640, Guangzhou, P.R. China.

Biotechnology Letters
|October 11, 2005
PubMed
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Ionic liquids enhance hydroxynitrile lyase (HNL) activity and stability in mandelonitrile cleavage. While beneficial for Prunus amygdalus HNL, some ionic liquids inactivated Manihot esculenta HNL.

Area of Science:

  • Biocatalysis
  • Enzyme engineering
  • Green chemistry

Background:

  • Hydroxynitrile lyases (HNLs) catalyze mandelonitrile cleavage, a key step in synthesizing valuable chiral compounds.
  • Enzyme stability and activity are crucial for efficient biocatalysis, often limited by reaction conditions.
  • Ionic liquids (ILs) offer unique solvent properties that can potentially enhance enzyme performance.

Purpose of the Study:

  • To investigate the effect of ionic liquids on the activity and stability of hydroxynitrile lyases from Prunus amygdalus (PaHNL) and Manihot esculenta (MeHNL).
  • To compare the performance of HNLs in ionic liquid-based media versus traditional organic solvents.
  • To evaluate the impact of specific imidazolium-based ionic liquids on enzyme-catalyzed transcyanation reactions.

Main Methods:

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  • Enzyme kinetic assays were performed using PaHNL and MeHNL in monophasic aqueous media containing 1-propyl-3-methylimidazolium tetrafluoroborate ([C4MIm][BF4]) and compared to acetonitrile or THF.
  • Thermostability of both HNLs was assessed in [C4MIm][BF4] and organic solvents.
  • PaHNL-catalyzed transcyanation in an aqueous/DIPE biphasic system was studied with the addition of various alkyl-methylimidazolium tetrafluoroborate ionic liquids.
  • The effect of ionic liquids on MeHNL activity, substrate conversion, and product enantiomeric excess (e.e.) was analyzed.

Main Results:

  • Mandelonitrile cleavage catalyzed by both PaHNL and MeHNL was faster in [C4MIm][BF4] than in acetonitrile or THF.
  • Both HNLs exhibited significantly higher thermostability in [C4MIm][BF4] compared to the organic solvents.
  • Addition of specific ionic liquids (1-butyl-, 1-pentyl-, 1-hexyl-3-methylimidazolium tetrafluoroborates) enhanced enzyme activity and product e.e. in PaHNL-catalyzed reactions.
  • MeHNL was found to be inactivated by these ionic liquids, leading to reduced reaction rate, substrate conversion, and product e.e.

Conclusions:

  • Ionic liquids, particularly [C4MIm][BF4], can significantly improve the activity and thermostability of PaHNL for mandelonitrile cleavage.
  • The effectiveness and impact of ionic liquids are enzyme-specific, as demonstrated by the contrasting effects on PaHNL and MeHNL.
  • Further research into tailored ionic liquid design is warranted to optimize biocatalytic processes involving sensitive enzymes like MeHNL.