FIG. 6.

Alignment of the deduced primary structures of the T4 and RB69 counterparts of gp44 and gp62. The boxed region in the gp44 panel marks the putative ATP-binding site of these proteins (25). The graphics below the primary structures depict distribution of amino acid identities between each pair of homologous proteins (Table 1). Also shown are the locations of gp44 and gp62 chain termination mutations that were sequenced (at the nucleotide level) in this work (T4 44amE4408, RB69 44am51, T4 62amE1140 and RB69 62am85) or previously by Hsu (7), i.e., T4 44amN82 and T4 44amB110. The mutant 44amB110, previously classified as tsB110 (4), forms small plaques at 30°C and no plaques at 42°C on sup° hosts.