Expression and characterization of a novel enantioselective lipase from Aspergillus fumigatus

Appl Biochem Biotechnol. 2012 Dec;168(7):1820-33. doi: 10.1007/s12010-012-9899-x. Epub 2012 Sep 28.

Abstract

A 1,080-bp cDNA (CGMCC 2873) encoding of a cold-active lipase of Aspergillus fumigatus (AFL67) was cloned and expressed in Escherichia coli for the first time. The new lipase, AFL67, was one-step purified by 8.30 folds through Ni-NTA affinity chromatography with a recovery of 86.8 %. The specific activity of purified AFL67 was 449 U mg(-1) on p-NP hexanoate. AFL67 preferentially hydrolyzed p-nitrophenyl esters of short- and medium-chain fatty acids, with p-nitrophenyl hexanoate the maximum. The optimum temperature and pH was 15 °C and 7.5, respectively. The purified AFL67 was stable at 10-25 °C for 30 min, and in the pH range of 6.0-9.0 for 16 h (at 4 °C). Its activity was increased by 47 and 50 %, in the presence of 10 % (v/v) ethanol and isopropanol, respectively. The new lipase AFL67 highly enantioselectively deacylated (S)-α-acetoxyphenylacetic acid (APA) and o-Cl-APA, m-Cl-APA, and p-Cl-APA to (S)-mandelic acid and its derivates. These features render this cold-active novel lipase AFL67 attractive for biotechnological applications in the field of enantioselective synthesis of chiral mandelic acids, o-acylated mandelic acids, and their derivates and detergent additives.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetates / chemistry
  • Acetates / metabolism
  • Aspergillus fumigatus / enzymology*
  • Aspergillus fumigatus / genetics
  • Cloning, Molecular
  • Enzyme Stability / drug effects
  • Escherichia coli / genetics
  • Gene Expression
  • Hydrogen-Ion Concentration
  • Hydrolysis
  • Lipase / chemistry
  • Lipase / genetics*
  • Lipase / isolation & purification
  • Lipase / metabolism*
  • Mandelic Acids / chemistry
  • Mandelic Acids / metabolism
  • Metals / pharmacology
  • Plasmids / genetics
  • Protease Inhibitors / pharmacology
  • Recombinant Proteins / chemistry
  • Recombinant Proteins / genetics
  • Recombinant Proteins / isolation & purification
  • Recombinant Proteins / metabolism
  • Solvents / pharmacology
  • Stereoisomerism
  • Substrate Specificity
  • Temperature

Substances

  • Acetates
  • Mandelic Acids
  • Metals
  • Protease Inhibitors
  • Recombinant Proteins
  • Solvents
  • Lipase
  • mandelic acid