FIG. 2.
Comparison of the coding regions of the tail proteins of ΦK1-5, ΦK5, and ΦK1E. All three phages share sequence similarity in the upstream region (which contains an SP6 promoter) as well as an 85-base intergenic region. Just downstream of the promoter, ΦK1-5 and ΦK5 encode a lyase protein and ΦK1E encodes ORFL. Immediately following the termination codons of the lyases or ORFL is the intergenic region that contains a potential hairpin structure, the first of which could be a Rho-independent transcription terminator. Immediately following this, ΦK1-5 and ΦK1E encode an endosialidase where ΦK5 encodes ORFP. None of the three phages have any coding regions downstream, and the DNA molecule ends in all three cases. No homology exists in this terminal region.