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http://dx.doi.org/10.4014/mbl.1505.05006

Production and Characterization of α-Galactosidases from Two Bacillus licheniformis Isolates  

Jin, Hyun Kyung (Food Science & Biotechnology Major, Woosong University)
Yoon, Ki-Hong (Food Science & Biotechnology Major, Woosong University)
Publication Information
Microbiology and Biotechnology Letters / v.43, no.3, 2015 , pp. 195-203 More about this Journal
Abstract
Two bacterial strains, Bacillus licheniformis YB-1413 and YB-1414, producing extracellular α-galactosidase, were obtained from homemade Doenjang. On the basis of their biochemical properties, 16S rRNA sequences and random amplified polymorphic DNA patterns by polymerase chain reaction, they were found to be somewhat different from one another. α-Galactosidase productivities of the two isolates were increased by wheat bran, but drastically decreased by melibiose, raffinose and sucrose which were used as carbon sources. The enzyme productivities were increased by yeast extract as a nitrogen source with maximum levels of 1.87 U/ml for YB-1413 and 1.69 U/ml for YB-1414, respectively. The enzymes of both isolates exhibited maximum activity for hydrolysis of para-nitrophenyl-α-D-galactopyranoside (pNP-αGal) under reaction conditions of pH 6.0 and 45℃. Their hydrolyzing activities for pNP-αGal were drastically decreased by the addition of low concentrations of ribose and galactose. They were capable of hydrolyzing completely α-1,6 linked galactosyl residue in melibiose, raffinose and stachyose, which are known to be anti-nutritional factors in products of soybean and legume. In relation to the latter, the isolates YB-1413 and YB-1414 have potential applicability in improving soybean-fermented foods and the nutritional value of soybean feed.
Keywords
Bacillus licheniformis; α -galactosidase; productivity; property;
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