Characterization and heterologous gene expression of a novel esterase from Lactobacillus casei CL96

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DOIResolve DOI: http://doi.org/10.1128/AEM.70.6.3213-3221.2004
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TypeArticle
Journal titleApplied and Environmental Microbiology
Volume70
Issue6
Pages32133221; # of pages: 9
SubjectAmino Acid Sequence; Bacteria; Base Sequence; Chromatography; Cloning,Molecular; Enzymes; enzymology; Escherichia coli; Esterases; Esters; Gene Expression; Hydrogen-Ion Concentration; Lactobacillus casei; Methylobacterium extorquens; Molecular Sequence Data; Pichia; Proteins; Recombinant Proteins; Sequence Alignment; Sequence Analysis,DNA; Temperature; Yeast
AbstractA 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 (PmxaF), 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°C, respectively. Among the pNP (p-nitrophenyl) esters tested, the most selective substrate was pNP-caprylate (C8), with Km and kcat values of 14 ± 1.08 μM and 1,245 ± 42.3 S⁻¹, respectively.
Publication date
LanguageEnglish
AffiliationNRC Biotechnology Research Institute; National Research Council Canada
Peer reviewedNo
NRC number47764
NPARC number3539741
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Record identifier2a7251f3-3bf1-4c18-a47a-ee297a1f57cc
Record created2009-03-01
Record modified2016-05-09
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