Impaired restriction endonuclease cleavage of DNA modified with N-methyl-N-nitrosourea

Abstract
This paper examines the ability of several restriction enzymes to cleave lambda DNA treated in vitro with N-methyl-N-nitrosourea. An impaired digestion was observed with all tested enzymes suggesting that the sequence specific restriction endonucleases are either unable to recognize carcinogen-modified sequences or to insert endonucleolytic cuts at such sites.

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