The effect of bisulfite modification on the template activity of DNA for DNA polymerase I1.

Abstract
Cytosine residues of poly(C) and heat-denatured calf thymus DNA were transformed into 5, 6-dihydrouracil-6-sulfonate (U(SO 3 )) residues by treatment with bisulfite. The poly(U(SO 3 ) 2 , C 3 ) and poly(U(SO 3 ) 9 , C 1 ) prepared did not form inter-base binding with either poly(A) or poly(I) as judged by the absence of hypochromicity in ultraviolet absorbance. U(SO 3 ) residues in the DNA inactivated it to serve as template for E. coli DNA polymerase I, while the template activity was restored by conversion of the U(SO 3 ) residues into U.

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