Abstract
N-terminal amino acid sequences of major capsid proteins (Mcps) of three vibriophages (KVP20, KVP40 and nt-1), two aeromonad phages (Aeh 1 and 65) and coliphage T4 were compared. All these phages are morphologically similar, belonging to family Myoviridae and the vernacular genus name "T4-like phages". A dendrogram constructed from homology data indicated that (i) the three vibriophages were closely related, (ii) the two aeromonad phages were also fairly related and (iii) these five phages were all distantly, but definitely, related to coliphage T4. These results suggest that Mcps of morphologically similar phages are highly conserved and may serve as a measure to assess the phylogenetic relationships among different phages of similar morphology.
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