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학술저널
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한국미생물생명공학회 Journal of Microbiology and Biotechnology Journal of Microbiology and Biotechnology 제17권 제4호
발행연도
2007.1
수록면
604 - 610 (7page)

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A psychrotrophic strain 7195 showing extracellularlipolytic activity towards tributyrin was isolated from deep-sea sediment of Prydz Bay and identified as a Psychrobacterspecies. By screening a genomic DNA library of Psychrobactersp. 7195, an open reading frame of 954 bp coding for a lipasegene, lipA1, was identified, cloned, and sequenced. Themass of 35,210 kDa. It had one consensus motif, G-N-S-M-G(GXSXG), containing the putative active-site serine, whichwas conserved in other cold-adapted lipolytic enzymes. Therecombinant LipA1 was purified by column chromatographywith DEAE Sepharose CL-4B, and Sephadex G-75, andpreparative polyacrylamide gel electrophoresis, in sequence.The purified enzyme showed highest activity at 30oC, and wasunstable at temperatures higher than 30owas a typical cold-adapted enzyme. The optimal pH for activitywas 9.0, and the enzyme was stable betwen pH 7.0-10.0after 24 h incubation at 4oC. The adition of Ca2+ and Mg2+enhanced the enzyme activity of LipA1, whereas the Cd2+,Zn2+, Co2+, Fe3+, Hg2+, Fe2+, Rb2+, and EDTA strongly inhibitedsuch as Triton X-100, Tween 80, Tween 40, Span 60, Span 40,CHAPS, and SDS, and showed better resistance towards them.Substrate specificity analysis showed that there was a preferencefor trimyristin and p-nitrophenyl myristate (C14 acyl groups).

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