Abstract
The synthesis of bacteriophage G4 DNA was examined in temperature-sensitive dna mutants under permissive and nonpermissive conditions. The infecting single-stranded G4 DNA was converted to the parental replicative form (RF) at the nonpermissive temperature in infected cells containing a temperature sensitive mutation in the dnaA, dnaB, dnaC, dnaE, or dnaG gene. The presence of 30 mug of chloramphenicol or 200 mug of rifampin per ml had no effect on parental RF synthesis in these mutants. Replication of G4 double-stranded RF DNA occurred at a normal rate in dnaAts cells at the nonpermissive temperature, but the rate was greatly reduced in cells containing a temperature-sensitive mutation in the dnaB, dnaC, dnaE, or dnaG gene. RF DNA replicated at normal rates in revertants of these dna temperature-sensitive host cells. The simplest interpretation of these observations is that none of the dna gene products tested is essential for the synthesis of the complementary DNA strand on the infecting single-stranded G4 DNA, whereas the dnaB, dnaC, dnaE, (DNA polymerase III), and dnaG gene products are all essential for replication of the double-stranded G4 RF DNA. The alternate possibility that one or more of the gene products are actually essential for G4 parental RF synthesis, even though this synthesis is not defective in the mutant hosts, is also discussed.
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Selected References
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