FIG. 1.

Map of the pblAB locus in S. mitis strains SF100 and PS344. The pblAB locus is an apparent mosaic of streptococcal phage sequences. ORF1, ORF2, ORF3, and pblA are similar to sequences of the L. lactis phage r1t. pblB is similar to an S. thermophilus phage 01205 gene encoding a tail fiber protein. ORF4, ORF5, ORF6, and ORF8 are not similar to any sequences reported in GenBank. ORF7 and lys are similar to sequences of the S. pneumoniae phage Dp-1. In PS344, the pblAB locus was replaced with the integrative vector pVA891. EcoRI sites (E), as well as select BglII (B) and HindIII (H) sites, are indicated.