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- W2056331666 abstract "Alternan is a unique α-D-glucan of potential commercial interest, produced by rare strains of Leuconostoc mesenteroides. Natural isolates that produce alternan, such as NRRL B-1355, also produce dextran as a troublesome contaminant. We previously isolated mutants of strain NRRL B-1355 that are deficient in dextran production, including the highly stable strain NRRL B-21138. In the current work, we mutagenized strain NRRL B-21138 and screened survivors for further alterations in production of alternansucrase, the enzyme that catalyzes the synthesis of alternan from sucrose. Second generation mutants included highly stable strain NRRL B-21297, which produced four-fold elevated levels of alternansucrase without an increase in the proportion of dextransucrase activity. Such alternansucrase overproducing strains will facilitate studies of this enzyme, and may become valuable for the enzymatic production of alternan. Another highly stable mutant strain, NRRL B-21414, grew slowly on sucrose with negligible production of glucan or extracellular glucansucrase activity. This strain may prove useful as an expression host for glucansucrase genes." @default.
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- W2056331666 date "1997-04-01" @default.
- W2056331666 modified "2023-10-12" @default.
- W2056331666 title "Alternansucrase mutants of Leuconostoc mesenteroides strain NRRL B-21138" @default.
- W2056331666 doi "https://doi.org/10.1038/sj.jim.2900380" @default.
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