Abstract
The Antarctic marine environment provides a good source of novel lipolytic enzymes that possess beneficial properties, i.e., resistance to extreme physical and chemical conditions. We found a lipolytic Escherichia coli colony that was transformed using genomic DNA from Marinobacter lipolyticus 27-A9 isolated from the Antarctic Ross Sea. DNA sequence analysis revealed an open reading frame of lipolytic enzyme gene. The gene translates a protein (LipA9) of 404 amino acids with molecular mass of 45,247 Da. Recombinant LipA9 was expressed in E. coli BL21 (DE3) cells and purified by anion exchange and gel filtration chromatography. The kcat/Km of LipA9 was 175 s−1 μM−1, and the optimum temperature and pH were 70 °C and pH 8.0, respectively. LipA9 had quite high organic solvent stability; it was stable toward several common organic solvents up to 50% concentration. Substrate specificity studies showed that LipA9 preferred a short acyl chain length of p-nitrophenyl ester and triglyceride. Sequence analysis showed that LipA9 contained catalytic Ser72 and Lys75 in S-x-x-K motif, like family VIII esterases. Homology modeling and site-directed mutagenesis studies revealed that Tyr141 and Tyr188 residues were located near the conserved motif and played an important role in catalytic activity.
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This work was supported by the Research Fund 2017 of The Catholic University of Korea. This work was also supported by Korea Polar Research Institute (PE18100).
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Park, S.H., Kim, Sj., Park, S. et al. Characterization of Organic Solvent-Tolerant Lipolytic Enzyme from Marinobacter lipolyticus Isolated from the Antarctic Ocean. Appl Biochem Biotechnol 187, 1046–1060 (2019). https://doi.org/10.1007/s12010-018-2865-5
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DOI: https://doi.org/10.1007/s12010-018-2865-5