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PMID:15184114
| Citation |
Choi, YJ, Miguez, CB and Lee, BH (2004) Characterization and heterologous gene expression of a novel esterase from Lactobacillus casei CL96. Appl. Environ. Microbiol. 70:3213-21 |
|---|---|
| Abstract |
A novel esterase gene (estI) of Lactobacillus casei CL96 was localized on a 3.3-kb BamHI DNA fragment containing an open reading frame (ORF) of 1,800 bp. The ORF of estI was isolated by PCR and expressed in Escherichia coli, the methylotrophic bacterium Methylobacterium extorquens, and the methylotrophic yeast Pichia pastoris under the control of T7, methanol dehydrogenase (P(mxaF)), and alcohol oxidase (AOX1) promoters, respectively. The amino acid sequence of EstI indicated that the esterase is a novel member of the GHSMG family of lipolytic enzymes and that the enzyme contains a lipase-like catalytic triad, consisting of Ser325, Asp516, and His558. E. coli BL21(DE3)/pLysS containing estI expressed a novel 67.5-kDa protein corresponding to EstI in an N-terminal fusion with the S. tag peptide. The recombinant L. casei CL96 EstI protein was purified to electrophoretic homogeneity in a one-step affinity chromatography procedure on S-protein agarose. The optimum pH and temperature of the purified enzyme were 7.0 and 37 degrees C, respectively. Among the pNP (p-nitrophenyl) esters tested, the most selective substrate was pNP-caprylate (C(8)), with K(m) and k(cat) values of 14 +/- 1.08 microM and 1,245 +/- 42.3 S(-1), respectively. |
| Links |
PubMed PMC427766 Online version:10.1128/AEM.70.6.3213-3221.2004 |
| Keywords |
Amino Acid Sequence; Base Sequence; Cloning, Molecular; Escherichia coli/enzymology; Escherichia coli/genetics; Esterases/genetics; Esterases/metabolism; Hydrogen-Ion Concentration; Lactobacillus casei/enzymology; Lactobacillus casei/genetics; Methylobacterium extorquens/enzymology; Methylobacterium extorquens/genetics; Molecular Sequence Data; Pichia/enzymology; Pichia/genetics; Recombinant Proteins/genetics; Recombinant Proteins/metabolism; Sequence Alignment; Sequence Analysis, DNA; Temperature |
| edit table |
Significance
Annotations
| Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
|---|---|---|---|---|---|---|---|---|
| GO:0034338: short-chain carboxylesterase activity |
ECO:0000314: |
F |
IDA is supported by Fig 5. Overexpression of esterase from Lactobacillus casei CL96 in E. coli BL21(DE3)/pLysS. A polypeptide with a molecular mass of about 68 kDa and esterase activity was produced, in agreement with the calculated molecular mass of the predicted amino acid sequence. |
complete | ||||
|
enables |
GO:0034338: short-chain carboxylesterase activity |
ECO:0000314: direct assay evidence used in manual assertion |
F |
Seeded From UniProt |
complete | |||
See also
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