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Nucleic Acids Research, 1985, Vol. 13, No. 10 3471-3478
© 1985

Articles

DNA methylation of viruses infecting a eukaryotic Chlorella-like green alga

James L. Van Etten, Anne M. Schuster, Lois Girton, Dwight E. Burbank, David Swinton and Stanley Hattman1

Department of Plant Pathology, University of Nebraska Lincoln, NE 62583-0722, USA 1Department of Biology, University of Rochester Rochester, NY 14627, USA

Received March 7, 1985. Revised April 18, 1985. Accepted April 18, 1985.

The genomic DNAs of the eukaryotic Chlorella-like green alga, strain NC64A, and eleven of its viruses all contain significant levels of 5-methyldeoxycytidine. In addition, the host DNA as well as six of the viral DNAs also contain N6-methyldeoxyadenosine. At least some of the methylated bases in the host reside in different base sequences than the nethylated bases in the viruses as shown by differential susceptibility to restriction endonuclease enzymes. This suggests that the viruses encode for DNA methyltransferases with sequence specificities different from that of the host enzyme.


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