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4,6-?-Glucanotransferase activity occurs more widespread in Lactobacillus strains and constitutes a separate GH70 subfamily.


ABSTRACT: Family 70 glycoside hydrolase glucansucrase enzymes exclusively occur in lactic acid bacteria and synthesize a wide range of ?-D-glucan (abbreviated as ?-glucan) oligo- and polysaccharides. Of the 47 characterized GH70 enzymes, 46 use sucrose as glucose donor. A single GH70 enzyme was recently found to be inactive with sucrose and to utilize maltooligosaccharides [(1?4)-?-D-glucooligosaccharides] as glucose donor substrates for ?-glucan synthesis, acting as a 4,6-?-glucanotransferase (4,6-?GT) enzyme. Here, we report the characterization of two further GH70 4,6-?GT enzymes, i.e., from Lactobacillus reuteri strains DSM 20016 and ML1, which use maltooligosaccharides as glucose donor. Both enzymes cleave ?1?4 glycosidic linkages and add the released glucose moieties one by one to the non-reducing end of growing linear ?-glucan chains via ?1?6 glycosidic linkages (?1?4 to ?1?6 transfer activity). In this way, they convert pure maltooligosaccharide substrates into linear ?-glucan product mixtures with about 50% ?1?6 glycosidic bonds (isomalto/maltooligosaccharides). These new ?-glucan products may provide an exciting type of carbohydrate for the food industry. The results show that 4,6-?GTs occur more widespread in family GH70 and can be considered as a GH70 subfamily. Sequence analysis allowed identification of amino acid residues in acceptor substrate binding subsites +1 and +2, differing between GH70 GTF and 4,6-?GT enzymes.

SUBMITTER: Leemhuis H 

PROVIDER: S-EPMC3536977 | biostudies-literature | 2013 Jan

REPOSITORIES: biostudies-literature

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4,6-α-Glucanotransferase activity occurs more widespread in Lactobacillus strains and constitutes a separate GH70 subfamily.

Leemhuis Hans H   Dijkman Willem P WP   Dobruchowska Justyna M JM   Pijning Tjaard T   Grijpstra Pieter P   Kralj Slavko S   Kamerling Johannis P JP   Dijkhuizen Lubbert L  

Applied microbiology and biotechnology 20120225 1


Family 70 glycoside hydrolase glucansucrase enzymes exclusively occur in lactic acid bacteria and synthesize a wide range of α-D-glucan (abbreviated as α-glucan) oligo- and polysaccharides. Of the 47 characterized GH70 enzymes, 46 use sucrose as glucose donor. A single GH70 enzyme was recently found to be inactive with sucrose and to utilize maltooligosaccharides [(1→4)-α-D-glucooligosaccharides] as glucose donor substrates for α-glucan synthesis, acting as a 4,6-α-glucanotransferase (4,6-αGT) e  ...[more]

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