Synthesis of α-galacto-oligosaccharides by a cloned α-galactosidase from Bifidobacterium adolescentis

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Abstract

A genomic library of Bifidobacterium adolescentis was constructed in Escherichia coli and a gene encoding an α-galactosidase was isolated. The identified open reading frame showed high similarity and identity with bacterial α-galactosidases, which belong to Family 36 of the glycosyl hydrolases. For the purification of the enzyme from the medium a single chromatography step was sufficient. The yield of the recombinant enzyme was 100 times higher than from B. adolescentis itself. In addition to hydrolytic activity the α-galactosidase showed transglycosylation activity and can be used for the production of α-galacto-oligosaccharides.

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