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The S-PM2 genome encodes a few surprisingly large (e.g., 3,779 amino acids) ORFs of unknown function. A total of 40 ORFs, organized into discrete clusters, encode homologues of T4 proteins involved in virion morphogenesis, nucleotide metabolism, gene regulation, and DNA replication and repair. There is a group I self-splicing intron within the gene encoding the D1 protein.

Twenty additional S-PM2 ORFs have homologues in the genomes of their cyanobacterial hosts. Of these ORFs, 19 appear to encode proteins associated with the cell envelope, including a putative S-layer-associated protein. It encodes 239 open reading frames (ORFs) and 25 tRNAs. The linear, circularly permuted, 196,280-bp double-stranded DNA genome of S-PM2 contains 37.8% G+C residues. A large lytic phage with an isometric icosahedral head, S-PM2 has a contractile tail and by this criterion is classified as a myovirus ( 1). Bacteriophage S-PM2 infects several strains of the abundant and ecologically important marine cyanobacterium Synechococcus.

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