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  • Title: Some structural features of an insoluble alpha-D-glucan from a mutant strain of Leuconostoc mesenteroides NRRL B-1355.
    Author: Cote GL, Ahlgren JA, Smith MR.
    Journal: J Ind Microbiol Biotechnol; 1999 Jul; 23(1):656-60. PubMed ID: 10455497.
    Abstract:
    Leuconostoc mesenteroides strain NRRL B-1355 produces two soluble extracellular alpha-D-glucans from sucrose: alternan and dextran. An unusual mutant strain derived from NRRL B-1355 has recently been isolated which produces practically no soluble polysaccharide, but significant amounts of an insoluble D-glucan. Methylation analysis shows it contains linear (1-->3) and (1-->6) linkages as well as (1-->2) and (1-->3) branch linkages. The insoluble glucan was partially digestible by endodextranase, giving rise to a series of oligosaccharides, a high-molecular weight soluble fraction and an insoluble residue. Treatment of the soluble dextranase-limit fraction with an alpha(1-->2) debranching enzyme led to further dextranase susceptibility. Methylation, FTIR and NMR analyses of the dextranase-treated fractions indicate a non-uniform structure with domains bearing similarities to L. mesenteroides strain NRRL B-1299 dextran and to insoluble streptococcal D-glucans.
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