On the evolution of the terminal redundancies of Klebsiella phage No. 11 and of coliphages T3 and T7.

The phylogenetic relationship between Klebsiella phage No. 11 and the classical coliphages T7 and T3, postulated in a previous study, was investigated at the nucleotide level by sequencing the termini of phage No. 11 DNA. This DNA was found to have a terminal redundancy of 181 base pairs. Comparison of the terminal sequences of T7, T3 and No. 11 DNA suggests that the terminal redundancies of the three phages contain different expansions and variations of the short 'founder sequence' 5' TTAACCTTGGG 3' of a common ancestor.