Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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Gene Cloning and Characterization of a Cold-Adapted Esterase from Acinetobacter venetianus V28

  • Kim, Young-Ok (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Heo, Yu Li (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Kim, Hyung-Kwoun (Division of Biotechnology, The Catholic University of Korea) ;
  • Nam, Bo-Hye (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Kong, Hee Jeong (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Kim, Dong-Gyun (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Kim, Woo-Jin (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Kim, Bong-Seok (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Jee, Young-Ju (Biotechnology Research Division, National Fisheries Research and Development Institute) ;
  • Lee, Sang-Jun (Biotechnology Research Division, National Fisheries Research and Development Institute)
  • Received : 2012.01.28
  • Accepted : 2012.04.25
  • Published : 2012.09.28
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Abstract

Acinetobacter venetians V28 was isolated from the intestine of righteye flounder, Poecilopsetta plinthus caught in Vietnam seawater, and the esterase gene was cloned using a shotgun method. The amino acid sequence deduced from the nucleotide sequence (1,017 bp) corresponded to a protein of 338 amino acid residues with a molecular weight of 37,186. The esterase had 87% and 72% identities with the lipases of A. junii SH205 and A. calcoaceticus RUH2202, respectively. The esterase contained a putative leader sequence, as well as the conserved catalytic triad (Ser, His, Asp), consensus pentapeptide GXSXG, and oxyanion hole sequence (HG). The protein from the strain V28 was produced in both a soluble and an insoluble form when the Escherichia coli cells harboring the gene were cultured at $18^{\circ}C$. The maximal activity of the purified enzyme was observed at a temperature of $40^{\circ}C$ and pH 9.0 using p-NP-caprylate as substrate; however, relative activity still reached to 70% even at $5^{\circ}C$ with an activation energy of 3.36 kcal/mol, which indicated that it was a cold-adapted enzyme. The enzyme was a nonmetallo-protein and was active against p-nitrophenyl esters of $C_4$, $C_8$, and $C_{14}$. Remarkably, this enzyme retained much of its activity in the presence of commercial detergents and organic solvents. This cold-adapted esterase will be applicable as catalysts for reaction in the presence of organic solvents and detergents.

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References

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