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    Cobalamin-Dependent and Cobalamin-Independent Methionine Synthases in Escherichia coli: Two Solutions to the Same Chemical Problem

    Two genes encoding proteins with methionine synthase activity are found in Escherichia coli. Both enzymes use methyltetrahydrofolate as a methyl donor to catalyze the conversion of homocysteine to methionine, as ...

    James T. Drummond, Rowena G. Matthews in Chemistry and Biology of Pteridines and Folates (1993)