Screening and characterization of trehalose-oleate hydrolyzing lipase

Ryo Ishimoto, Manabu Sugimoto, Fusako Kawai

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Various soil samples were collected to screen the presence of microorganisms which have ability to degrade TOE. One strain (AKU-883) with good TOE degrading activity was isolated and identified as Burkholderia cepacia and the extracellular enzyme was purified to homogeneity. The purification was achieved by ultrafiltration, Super Q anion-exchange chromatography and Superdex 200HR gel-filtration in the presence of Triton X. The enzyme was purified to 85-fold, and specific activity of 4.910 kU mg protein-1. The peak preparation on gel filtration showed a single band of 34 kDa on SDS-PAGE and native PAGE which indicate the monomeric nature of the enzyme. The pI of the enzyme was 6.3. The enzyme showed the maximum activity at pH 9 and 65°C, and was stable in the range of pH 5-10 and up to 60°C. Almost all the activity (92%) was kept after incubation for more than 1 week at 50°C (pH 7.3). High activities remained even in water-miscible solvents such as ethanol, dimethyl formamide, diisopropyl ether, and dioxane. The N-terminal 16 amino acid residues were determined as A-N-G-Y-A-A-T-R-Y-P-I-I-L-V-G-G, which showed a consensus sequence for lipases from Burkholderia species. Thus the enzyme was concluded to be a kind of lipase.

Original languageEnglish
Pages (from-to)231-235
Number of pages5
JournalFEMS Microbiology Letters
Volume195
Issue number2
DOIs
Publication statusPublished - Feb 20 2001

Keywords

  • Burkholderia species
  • Lipase
  • Trehalose-oleate

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology
  • Genetics

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