Journal of Microbiology and Biotechnology

The Korean Society for Microbiology and Biotechnology (한국미생물·생명공학회)
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A Novel Esterase from a Marine Metagenomic Library Exhibiting Salt Tolerance Ability

  • Fang, Zeming (School of Life Sciences, Anhui University) ;
  • Li, Jingjing (School of Life Sciences, Anhui University) ;
  • Wang, Quan (School of Life Sciences, Anhui University) ;
  • Fang, Wei (School of Life Sciences, Anhui University) ;
  • Peng, Hui (School of Life Sciences, Anhui University) ;
  • Zhang, Xuecheng (School of Life Sciences, Anhui University) ;
  • Xiao, Yazhong (School of Life Sciences, Anhui University)
  • Received : 2013.11.22
  • Accepted : 2014.03.11
  • Published : 2014.06.28
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Abstract

A putative lipolytic enzyme gene, named as est9x, was obtained from a marine microbial metagenome of the South China Sea. Sequence analysis showed that Est9X shares lower than 27% sequence identities with the characterized lipolytic enzymes, but possesses a catalytic triad highly conserved in lipolytic enzymes of the ${\alpha}/{\beta}$ hydrolase superfamily. By phylogenetic tree construction, Est9X was grouped into a new lipase/esterase family. To understand Est9X protein in depth, it was recombinantly expressed, purified, and biochemically characterized. Within potential hydrolytic activities, only lipase/esterase activity was detected for Est9X, confirming its identity as a lipolytic enzyme. When using p-nitrophenol esters with varying lengths of fatty acid as substrates, Est9X exhibited the highest activity to the C2 substrate, indicating it is an esterase. The optimal activity of Est9X occurred at a temperature of $65^{\cric}C$, and Est9X was pretty stable below the optimum temperature. Distinguished from other salt-tolerant esterases, Est9X's activity was tolerant to and even promoted by as high as 4 M NaCl. Our results imply that Est9X is a unique esterase and could be a potential candidate for industrial application under extreme conditions.

Keywords

References

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