Abstract
Leuconostoc mesenteroides NRRL B-742 produces two exocellular α- d-glucans, namely, fraction L, which consists of an α- d-(1→6) backbone with α- d-(1→4) branch-points, and fraction S, which consists of an α- d-(1→6) backbone with α- d-(1→3) branch-points. It was found that the percentage of α- d-(1→3) branch-points in fraction S glucan is variable, depending on the conditions under which it is synthesized from sucrose by the exocellular glucansucrase, and that α- d-(1→3) branch formation by this glucansucrase occurs by acceptor reactions in which α- d-glucosyl groups are transferred from sucrose to OH-3 groups on α- d-(1→6)-linked d-glucan chains. Thus, any change in reaction conditions that affects the rate of acceptor reactions relative to chain elongation also affects the degree of branching in B-742 fraction S dextran. It was also found that this glucansucrase is capable of modifying other dextrans, such as B-512F and B-742 fraction L, by transferring d-glucosyl groups to OH-3 of d-glucosyl residues in these dextrans as well.
Published Version
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