Abstract
Chloramphenicol affects several steps in the DNA replication of mycoplasma virus L51, a noncytocidal, naked, bullet-shaped virion containing circular single-stranded (SS) DNA of 1.5 X 10(6) daltons (4.5 kilobases). In the presence of chloramphenicol, adsorption was normal and parental SS DNA was converted to double-stranded replicative forms (RF), but subsequent RF leads to RF replication was inhibited. Chloramphenicol added late in infection, when most viral nascent DNA is in progeny SS molecules, inhibited SS synthesis, but nascent RF molecules were formed. However, a chase experiment showed that these RF molecules could not be converted to SS DNA. Therefore, viral RF molecules made in the presence of chloramphenicol are not functional as SS DNA precursors.
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Selected References
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