Purification and catalytic properties of novel enantioselective lipase from Acinetobacter sp. ES-1 for hydrolysis of ( S)-ketoprofen ethyl ester
A novel enantioselective lipase from Acinetobacter sp. ES-1 exhibiting an excellent enantioselectivity for ( S)-ketoprofen ethyl ester was purified to homogeneity using hydrophobic interaction chromatography. The molecular weight and p I value of the purified enantioselective lipase were 32 kDa and...
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Published in | Enzyme and microbial technology Vol. 38; no. 3; pp. 443 - 448 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Amsterdam
Elsevier Inc
01.02.2006
Elsevier Science |
Subjects | |
Online Access | Get full text |
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Summary: | A novel enantioselective lipase from
Acinetobacter sp. ES-1 exhibiting an excellent enantioselectivity for (
S)-ketoprofen ethyl ester was purified to homogeneity using hydrophobic interaction chromatography. The molecular weight and p
I value of the purified enantioselective lipase were 32
kDa and 6.2, respectively, and the optimal temperature and pH were 40
°C and 7.0. The activity was enhanced 1.5-fold in the presence of Ca
2+ ions, and showed the substrate specificity preferably for a medium-chain length, such as triacylglycerides and
p-nitrophenyl esters. The N-terminal amino acid residue was A–V–R–S–I–D–G–L–A–I–N–Q–S–A, and no homology was found among other known lipases, indicating a novel type enzyme. The enantioselective hydrolysis of (
R,
S)-ketoprofen ethyl ester to optically pure (
S)-ketoprofen was carried out in the aqueous phase reaction system achieving an high enantiomeric excess of 0.99 and conversion yield of 0.49 after 72
h. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 0141-0229 1879-0909 |
DOI: | 10.1016/j.enzmictec.2005.06.017 |