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Purification and characterization of hydrolytic and transgalactosyl α-galactosidase from Lactobacillus helveticus ATCC 10797

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Abstract

α-Galactosidase purified from Lactobacillus helveticus ATCC 10797 by fast performance liquid chromatography system using ion exchange and gel-filtration columns showed the K m of 3.83 mM and V max of 416.44 µmol/min/mg protein calculated from the substrate p-nitrophenyl-α-d-galactopyranoside. The molecular mass was 188 kDa by gel-filtration, but 90 kDa by SDS-PAGE, indicating a homodimer. The optimum temperature was 37 °C, and the optimum pH was at 6 with an acceptable stability between pH 4 and 8. This enzyme was activated by 10 mM monovalent ions such as K+, NH4 +, Li+, and CS+, while the activity was inhibited by divalent ions such as Cu2+, Zn2+, and Fe2+. Melibiose was hydrolyzed to glucose and galactose, raffinose to galactose and sucrose, while stachyose to galactose and sucrose. A novel source of α-galactosidase from L. helveticus possessing both hydrolytic activity to eliminate flatulence sugars and transgalactosylation activities to synthesize galacto-oligosaccharides is identified and characterized.

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Correspondence to Byong H. Lee.

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Kandari, S., Choi, Y.J. & Lee, B.H. Purification and characterization of hydrolytic and transgalactosyl α-galactosidase from Lactobacillus helveticus ATCC 10797. Eur Food Res Technol 239, 877–884 (2014). https://doi.org/10.1007/s00217-014-2284-y

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