The purification and properties of a factor containing vitamin B12 concerned in the synthesis of methionine by <i>Escherichia coli</i>

Abstract

ENZYMIC HYDROLYSIS OF BRANCHED DEXTRAN 519 with branch links on every sixth, seventh and eighth anhydroglucose unit respectively will yield, on hydrolysis with Lb. bifidus dextranase, oligosac- charides in unequal proportions. The approxi- mately equal quantities of isomalto-triose, -tetraose and -pentaose produced iidicate that the branching of this dextran is random. The presence in the digest of much material containing more than six glucosyl units is further support for a random branching of the dextran molecule.