Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Screening and Characterization of an Esterase from a Metagenomic Library

  • KIM JEONG-NYEO (Department of Biotechnology, Yonsei University) ;
  • SEO MYUNG-JI (Bioproducts Research Center, Yonsei University) ;
  • CHO EUN-AH (Department of Biotechnology, Yonsei University) ;
  • LEE SANG-JAE (Department of Biotechnology, Yonsei University) ;
  • KIM SEONG-BO (Department of Biotechnology, Yonsei University) ;
  • CHEIGH CHAN-ICK (Department of Biotechnology, Yonsei University) ;
  • PYUN YU-RYANG (Department of Biotechnology, Yonsei University)
  • Published : 2005.10.01
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Abstract

A metagenomic library was constructed using a fosmid vector, and total genomic DNA was extracted directly from soil at Cisolok (hot spring area, Indonesia). This library was composed of 10,214 clones and screened for lipolytic enzyme on tributyrin agar plates. An esterase gene (estMa) was subcloned and sequenced from a positive lipolytic active clone. Esterase EstMa was encoded by a 954-bp open reading frame and showed low ($11-33\%$) amino acid similarity to known esterases. The amino acid sequence analysis demonstrated that the enzyme is a new member of lipolytic enzyme family VI. The estMa gene encodes a preprotein of 317 amino acids with a predicted molecular mass of 34,799 Da. The purified enzyme exhibited optimal activity at $50^{\circ}C$ and pH 6.5. The $K_m,\;and\;V_{max}$ values of EstMa for the hydrolysis of p-nitrophenyl valerate were $45.3\;{\mu}M$ and 4.45 U/mg, respectively.

Keywords

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