Abstract
Vibrio sp. GMD509, a marine bacterium isolated from eggs of the sea hare, exhibited lipolytic activity on tributyrin (TBN) plate, and the gene representing lipolytic activity was cloned. As a result, an open reading frame (ORF) consisting of 1,017 bp (338 aa) was found, and the deduced amino acid sequence of the ORF showed low similarity (<20%) to α/β hydrolases such as dienelactone hydrolases and esterase/lipase with G–X1–S–X2–G sequence conserved. Phylogenetic analysis suggested that the protein belonged to a new family of esterase/lipase together with various hypothetical proteins. The enzyme was overexpressed in Escherichia coli and purified to homogeneity. The purified enzyme (Vlip509) showed the best hydrolyzing activity toward p-nitrophenyl butyrate (C4) among various p-nitrophenyl esters (C2 to C18), and optimal activity of Vlip509 occurred at 30°C and pH 8.5, respectively. Kinetic parameters toward p-nitrophenyl butyrate were determined as Km (307 μM), kcat (5.72 s−1), and kcat/Km (18.61 s−1 mM−1). Furthermore, Vlip509 preferentially hydrolyzed the S-enantiomer of racemic ofloxacin ester. Despite its sequence homology to dienelactone hydrolase, Vlip509 showed no dienelactone hydrolase activity. This study represents the identification of a novel lipolytic enzyme from marine environment.
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Acknowledgment
We thank Mr. H. S. Na in Enzychem for the helpful discussion. This work was supported by KORDI in-house program (PE97803) and the Marine and Extreme Genome Research Center Program, Ministry of Marine Affairs and Fisheries, Republic of Korea.
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Park, SY., Kim, JT., Kang, S.G. et al. A new esterase showing similarity to putative dienelactone hydrolase from a strict marine bacterium, Vibrio sp. GMD509. Appl Microbiol Biotechnol 77, 107–115 (2007). https://doi.org/10.1007/s00253-007-1134-2
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DOI: https://doi.org/10.1007/s00253-007-1134-2