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The template activity of Cancer pagurus DNA and its two components (poly d(A-T) and main component) in response to a DNA polymerase purified from regenerating rat liver has been studied and compared to the results previously obtained with synthetic templates. In the double-stranded native state, whole crab DNA and the main component were poor templates. Their replication was increased by thermal denaturation and inhibited by actinomycin. Like the synthetic copolymer poly[d(A-T).d(T-A)], native crab poly d(A-T) could be copied and its duplication was not inhibited by actinomycin. The structural difference between native poly d(A-T) Form I, isolated on a density gradient, and partially renatured poly d(A-T) Form II, isolated on hydroxylapatite, resulted in a modification of their template activity. The kinetic studies of [(3)H] dGMP and [(3)H] dAMP incorporation confirmed the importance of single-stranded regions (particulary dC regions) in the initiation of the in vitro duplication.

Deoxyribonucleic acid of Cancer pagurus. II. Template activity for a DNA-dependent DNA polymerase of eukaryotic cells