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Nucleic Acids Research, 1975, Vol. 2, No. 8 1391-1400
© 1975

Articles

Specificity of a deoxyribonucleic acid transmethylase induced by bacteriophage T2. I. Nucleotide sequences isolated from Micrococcus luteus DNA methylated in vitro

H. van Ormondt, J. Gorter, K.J. Havelaar and A. de Waard

Department of Physiological Chemistry, University of Leiden Sylvius Laboratories, Wassenaarseweg 72, Leiden, The Netherlands

Received June 30, 1975. Deoxyribonucleic acid from Micrococcus luteus was methylated in vitro in the presence of S-adenosyl-(14C methyl)methionine with a DNA methyltransferase purified from extracts of E. coli infected with bacteriophage T2. The labelled DNA was degraded by enzymatic and specific chemical methods and there sulting short oligonucleotides were separated and characterized. The analytical data permit the conclusion that the DNA transmethylase reacts specifically with N-G-A-T-C-N sequences in which it converts adenine to a6-methyl-aminopurine residue.


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