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Lytic genes and transcription from the Halobacterium salinarium phage phi H were studied. Genes for three structural proteins were located to the left arm of the linear phage genome. The right arm was shown to encode three DNA cytosine methyltransferases, the first such sequences reported from an archaebacterium. One cytosine methyltransferase is of the N(4)-methyltransferase type. The other two open reading frames (ORFs) seem to be parts of the same gene, which has been split by a recombination event. This gene product is of the C5-methyltransferase type. The methyltransferase genes are the first phi H genes detected showing high homology to eubacterial proteins. Five of the six described gene products have a higher proportion acidic over basic amino acid residues, a common characteristic of halobacterial proteins. Lytic phi H transcription was shown to produce three RNA species, two shorter species encoding the methyltransferase genes and one large species transcribed from both the right and the left phage arm and subsequently being processed upstream of the region encoding the structural proteins.

biological chemistry hoppe-seyler

Genes for DNACytosine Methyltransferases and Structural Proteins, Expressed during Lytic Growth by the Phage ΦH of the Archaebacterium  Halobacterium salinarium