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Dextransucrase of Leuconostoc mesenteroides - mechanism of dextran and oligosaccharides biosynthesis

100%

Kubik C. , Sikora B. , Galas E.

nr 2

98-110

Dextransucrase catalyses the synthesis of a-D-glucopyranosyl homopolymers and oligomers from sucrose as a substrate. This paper is a review of reports on the mechanism of dextran and oligosaccharides synthesis. The presence of a low molecular acceptor dextran (3-20 kDa) or low molecular acceptor sugars in reaction mixtures enables obtaining of dextran with molecular weight in a range from 30 to 80 kDa or oligosaccharides with low d.p., which have gained increased nutritional interest (prebiotics). In these reactions, the hydrolytic enzyme, i.e. dextranase, may be involved together with dextransucrase instead of acceptors.

Enzymatic synthesis of oligosaccharides

80%

S. B. S. , Buchowiecka A. , Gajewska M.

nr 1

67-83

A key role of oligosaccharides in biological processes becoming more obvious every day. An increasing interest in this group of biomolecules is related to their broad spectrum of applications, i.e. in food, feed and pharmaceutical industries, in cosmetics and medicine. Efficient, full-scale processes that allow to produce different types of these oligomers are of graet importance. Biocatalysis is considered very attractive in comparison to the non specific, time-consuming and often environmental unfriendly chemical technologies of oligosaccharide production. Two groups of enzymes are involved in this process, transferases and glycosidase. This review describes oligosaccharide synthesis through the reactions of transfer, transglycosylation and reverse hydrolysis.

Short-chain oligosaccharide synthesis by endo-beta-1,3 gluconase from Oerskovia xanthineolytica

80%

Bielecki S. , Bukowiecka A.

nr 2

184-191

An approach for enzymatic sythesis of oligosachcharides via transglycosylation with endo-beta-1,3-glucanase from Oerskovia xanthineolytica is described.Linear -beta-1,3-glucan (laminarin) was used as a donor of glycosyl residues, whereas nitrophenyl glycosides of different monosaccharides served as acceptors.The synthesis was performed in water-organic solvent environment with several combinations of donor/acceptor.Employing p-nitrophenyl-beta-D-xylopyranoside as an acceptor in the presence of 30% acetonitrile resulted in the production of six new glycosides shown by FAB MS to be di-, tri- and tetrasaccharides.This enzyme is therefore suitable for the synthesis of short-chain oligosaccharides.