Abstract
Glycinamide ribotide transformylase from Escherichia coli was obtained free of N5,N10-methenyltetrahydrofolate cyclohydrolase activity by DEAE-cellulose chromatography. In reaction mixtures containing this enzyme preparation in potassium maleate buffer, pH 7.2, no detectable interconversion of N5,N10-methenyltetrahydrofolate occurred. Upon addition of glycinamide ribotide, N-formylglycinamide ribotide was formed when N10-formyltetrahydrofolate was present; no formylation occurred in the presence of N5,N10-methenyltetrahydrofolate. A method for the synthesis and purification of glycinamide ribotide is presented.
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