Abstract
Functional screening studies revealed that Aspergillus carbonarius ATCC6276 produced extracellular β-galactosidase activity potentially suited for use as a lactase digestive supplement in the treatment of lactose intolerance. The crude preparation contained two β-galactosidase activities, β-gal 1 and β-gal 2, which were separated by ion-exchange chromatography. Both enzymes were purified to homogeneity by a combination of gel filtration, ion-exchange, chromatofocusing and hydrophobic interaction chromatographies. β-gal 1 and β-gal 2 displayed differences in molecular mass (110 kDa versus 120 kDa as judged by SDS PAGE) and in a range of additional physicochemical properties. Km values of 83 and 309 mM, respectively, were recorded using lactose as substrate while temperature optima of 55°C versus 65°C were obtained. Unlike current commercialized supplemental lactases, both of the purified enzymes displayed significant stability when exposed to simulated gastric conditions, with β-gal 1in particular retaining 70% residual activity after exposure to pH 2.0 in the presence of pepsin for 2 h. Overall the results indicate that the β-galactosidases of Aspergillus carbonarius ATCC6276, either individually or in combination, may be suitable for use as a digestive supplement for the alleviation of lactose intolerance.
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Funded in part by Enterprise Ireland under the Irish National Development Program, 2001–2006.
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O’Connell, S., Walsh, G. Application Relevant Studies of Fungal β-galactosidases with Potential Application in the Alleviation of Lactose Intolerance. Appl Biochem Biotechnol 149, 129–138 (2008). https://doi.org/10.1007/s12010-007-8098-7
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DOI: https://doi.org/10.1007/s12010-007-8098-7