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• W2130558603 abstract "Recombinant β-galactosidase from Lactobacillus plantarum WCFS1, homologously over-expressed in L. plantarum, was purified to apparent homogeneity using p-aminobenzyl 1-thio-β-d-galactopyranoside affinity chromatography and subsequently characterized. The enzyme is a heterodimer of the LacLM-family type, consisting of a small subunit of 35 kDa and a large subunit of 72 kDa. The optimum pH for hydrolysis of its preferred substrates o-nitrophenyl-β-d-galactopyranoside (oNPG) and lactose is 7.5 and 7.0, and optimum temperature for these reactions is 55 and 60 °C, respectively. The enzyme is most stable in the pH range of 6.5–8.0. The Km, kcat and kcat/Km values for oNPG and lactose are 0.9 mM, 92 s−1, 130 mM−1 s−1 and 29 mM, 98 s−1, 3.3 mM−1 s−1, respectively. The L. plantarum β-galactosidase possesses a high transgalactosylation activity and was used for the synthesis of prebiotic galacto-oligosaccharides (GOS). The resulting GOS mixture was analyzed in detail, and major components were identified by using high performance anion exchange chromatography with pulsed amperometric detection (HPAEC-PAD) as well as capillary electrophoresis. The maximal GOS yield was 41% (w/w) of total sugars at 85% lactose conversion (600 mM initial lactose concentration). The enzyme showed a strong preference for the formation of β-(1→6) linkages in its transgalactosylation mode, while β-(1→3)-linked products were formed to a lesser extent, comprising ∼80% and 9%, respectively, of the newly formed glycosidic linkages in the oligosaccharide mixture at maximum GOS formation. The main individual products formed were β-d-Galp-(1→6)-d-Lac, accounting for 34% of total GOS, and β-d-Galp-(1→6)-d-Glc, making up 29% of total GOS." @default.
• W2130558603 created "2016-06-24" @default.
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• W2130558603 date "2010-07-01" @default.
• W2130558603 modified "2023-10-05" @default.
• W2130558603 title "β-Galactosidase from Lactobacillus plantarum WCFS1: biochemical characterization and formation of prebiotic galacto-oligosaccharides" @default.
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• W2130558603 doi "https://doi.org/10.1016/j.carres.2010.03.028" @default.
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