Nucleic Acids Research, 1977, Vol. 4, No. 12 4211-4222
© 1977
Articles |
Specificity of Hpa II and Hae II DNA methylases
Department of Microbiology, The Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
Received October 31, 1977.
The methylases M·HaeIII and M·HpaII recognize the tetranucleotide sequences
and
respectively, in DNA, and transfer a methyl group from 5-adenosylmethionine to the 5-position of cytosine on each strand as indicated by the asterisks. Restriction endonuclease R·HaeIII does not cleave the methylated sequence
but can cleave
in which methylation is introduced on the unn external cytosine positions. Similarly, R·HpaII does not cleave
but can cleave
.
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