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Endonuclease II-deficient, ligase-deficient double mutants of phage T4 induce considerably more deoxyribonucleic acid (DNA) synthesis after infection of Escherichia coli B than does the ligase-deficient single mutant. Furthermore, the double mutant can replicate 10 to 15% as well as wild-type T4, whereas the single mutant fails to replicate. When the E. coli host is also deficient in ligase, the double mutant resembles the single mutant. The results indicate that host ligase can substitute for phage ligase when the host DNA is not attacked by the phage-induced endonuclease II.

Partial Suppression of Bacteriophage T4 Ligase Mutations by T4 Endonuclease II Deficiency: Role of Host Ligase