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An organic solvent and thermally stable lipase fromBurkholderia ambifariaYCJ01: Purification, characteristics and application for chiral resolution of mandelic acid

Journal of Molecular Catalysis B Enzymatic
DOI: 10.1016/j.molcatb.2012.08.016
  • Organic Solvent Stability
  • Lipase
  • Burkholderia Ambifaria
  • Chiral Resolution
  • Mandelic Acid
  • Pharmacology


Abstract A solvent-tolerant bacterium Burkholderia ambifaria YCJ01 was newly isolated by DMSO enrichment of the medium. The lipase from the strain YCJ01 was purified to homogeneity with apparent molecular mass of 34kDa determined by SDS-PAGE. The purified lipase exhibited maximal activity at a temperature of 60°C and a pH of 7.5. The lipase was very stable below 55°C for 7days (remaining 80.3% initial activity) or at 30°C for 60days. PMSF significantly inhibited the lipase activity, while EDTA had no effect on the activity. Strikingly, the lipase showed distinct super-stability to the most tested hydrophilic and hydrophobic solvents (25%, v/v) for 60days, and different optimal pH in contrast with the alkaline lipase from B. cepacia S31. The lipase demonstrated excellent enantioselective transesterification toward the S-isomer of mandelic acid with a theoretical conversion yield of 50%, eep of 99.9% and ees of 99.9%, which made it an exploitable biocatalyst for organic synthesis and pharmaceutical industries.

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