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http://dx.doi.org/10.9721/KJFST.2011.43.2.169

${\beta}$-1,4-Xylosidase Activity of Leuconostoc Lactic Acid Bacteria Isolated from Kimchi  

Jang, Mi-Hee (School of Biotechnology and Bioengineering, Kangwon National University)
Kim, Myoung-Dong (School of Biotechnology and Bioengineering, Kangwon National University)
Publication Information
Korean Journal of Food Science and Technology / v.43, no.2, 2011 , pp. 169-175 More about this Journal
Abstract
The ${\beta}$-xylosidase (EC 3.2.1.37) production capabilities of lactic acid bacteria in the genus Leuconostoc, isolated from a variety of kimchi (fermented vegetables), were examined. The intracellular levels of ${\beta}$-xylosidase were similar to the extracellular levels, when most Leuconostoc lactic acid bacteria were grown in a medium containing xylose as the carbon source. Intracellular ${\beta}$-xylosidase with a maximum activity of $1.2{\pm}0.1units/mL$ (mean${\pm}$standard error) was obtained from Leuconostoc lactis KCTC 13344, which was isolated from fermented Chinese cabbage. The optimum reaction conditions for Leu. lactis KCTC 13344 ${\beta}$-xylosidase activity were pH 6.0 and $30^{\circ}C$, and the addition of most divalent cations, except zinc, to the reaction mixture resulted in a slight increase in enzyme activity. Compared with a media containing other carbon sources, the ${\beta}$-xylosidase activity was 5 times higher when Leu. lactis KCTC 13344 was grown in a medium containing xylose as carbon source. Zymographic analysis indicated that the synthesis of Leu. lactis KCTC 13344 ${\beta}$-xylosidase (approximate size, 64 kDa) is induced by xylose. A maximum intracellular ${\beta}$-xylosidase activity of $7.1{\pm}0.3units/mL$ was obtained in a batch cultivation in an MRS medium containing 30 g/L xylose.
Keywords
${\beta}$-xylosidase; kimchi; lactic acid bacteria; Leuconostoc lactis; xylose;
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