Abstract
DNA of Escherichia coli virus T1 is resistant to MboI cleavage and appears to be heavily methylated. Analysis of methylation by the isoschizomeric restriction enzymes Sau3AI and DpnI revealed that recognition sites for E. coli DNA adenine methylase (dam methylase) are methylated. The same methylation pattern was found for virus T1 DNA grown on an E. coli dam host, indicating a T1-specific DNA methyltransferase.
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