[Interaction of EcoRII restriction and modification enzyme with synthetic DNA fragments. IV. DNA duplexes with phosphoamide and pyrophosphate internucleotide bonds--the substrates for the study of single-strand breaks].


A set of DNA duplexes with repeated EcoRII, EcoRI and AluI restriction endonuclease recognition sites in which EcoRII scissile phosphodiester bonds were replaced by phosphoramide or uncleavable pyrophosphate bonds have been synthesized. Endonuclease EcoRII was found not to cleave the substrate at the phosphoramide bond. The substrates containing non… (More)


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