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Characterization of Extracellular $\alpha$-Galactosidase Produced by Bacillus licheniformis YB-42.  

김현숙 (우송대학교 응용식품ㆍ영양학부)
이경섭 (우송대학교 응용식품ㆍ영양학)
소재호 (우송대학교 응용식품ㆍ영양학)
이미성 (씨티씨바이오 중앙연구)
최준호 (씨티씨바이오 중앙연구)
윤기홍 (우송대학교 응용식품ㆍ영양학부, 우송대학교 생물소재 응용연구센터)
Publication Information
Microbiology and Biotechnology Letters / v.32, no.2, 2004 , pp. 128-134 More about this Journal
Abstract
A bacterium producing the $\alpha$-galactosidase was isolated from Korean soybean paste. The isolate YB-42 has been identified as Bacillus licheniformis on the basis on its 16S rRNA sequence, morphology and biochemical properties. The $\alpha$-galactosidase activity was detected in both the culture supernatant and the cell extract of B. licheniformis YB-42. The partially purified extracellular $\alpha$-galactosidase was obtained from the culture supernatant by DEAE-Sepharose column and Q-Sepharose column chromatography. The enzyme showed the maximum activity for hydrolysis of para-nitrophenyl-$\alpha$-D-galactopyranoside (pNP-$\alpha$Gal) at pH 6.5 and $45^{\circ}C$. It was able to hydrolyze oligomeric substrates such as melibiose, raffmose and stachyose to liberate galactose residue, indicating that the a-galactosidase of B. licheniformis YB-42 hydrolyzed $\alpha$-1,6 linkage. The hydrolyzing activity of $\alpha$-galactosidase for both pNP-$\alpha$Gal and melibiose was dramatically decreased by galactose. Both glucose and mannose inhibited the activity for pNP-$\alpha$Gal less than galactose.
Keywords
Bacillus licheniformis; identification; $\alpha$-galactosidase; property; reaction product;
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