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A modified purification is described for an enzyme, from Escherichiacoli B, which polymerizes deoxyribonucleoside-5' diphosphates. Under appropriate conditions, the enzyme will add a single deoxyribonucleotide residue to a deoxyribo-oligonucleotide primer. At all stages, the enzyme activity copurified with the activity which will polymerize adenosine-5' diphosphate (polynucleotide phosphorylase). Studies of heat stability, the effect of various temperatures of reaction and of disc gel electrophoresis failed to provide evidence that the two activities are separable.

Enzymatic synthesis of deoxyribo-oligonucleotides of defined sequence. Properties of the enzyme