restriction and modification in bacillus subtilis: nucleotide sequence, functional organization and product of the dna methyltransferase gene of bacteriophage spr.bacillus subtilis phage spr codes for a dna methyltransferase (mtase) which methylates the 5' cytosine in the sequence ggcc and both cytosines in the sequence ccgg. a 2126-bp fragment of spr dna containing the mtase gene has been sequenced. this fragment has only one significant open reading frame of 1347 bp, which corresponds to the mtase gene. within the sequence the mtase promoter has been defined by s1 mapping. the size of the spr mtase predicted from the deduced amino acid composition is 49 ...19846092231
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