title: F-Factor-mediated restriction of bacteriophage T7: synthesis of RNA and protein in T7-infected Escherichia coli F- and F+ cells.
abstract: Bacteriophage T7 is unable to productively infect Escherichia coli strains carrying the sex factor F. T7 phage development, in terms of RNA and protein synthesis, was compared in T7-infected isogenic F- and F+ strains of E. coli. Slightly less T7 early mRNA and early protein were synthesized in F+ cells. In addition to the defect in T7 late protein production in F+ cells reported by others, significantly less T7 late mRNA was synthesized, about one-half of that produced in T7-infected F- cells. Moreover, host RNA synthesis was not completely inhibited. The protein-synthesizing ability of T7-infected F+ cells decayed much faster than that of F- cells both in vivo and in vitro. This faster decay appears to explain the failure of F+ cells to produce T7 late protein in vivo, even in the presence of a considerable amount of translatable T7 late mRNA. Therefore, it may not be necessary to postulate the involvement of specific translational discrimination against T7 late mRNA, although it appears that F-factor-mediated restriction of T7 involves changes in transcription as well as translation.
mesh_terms: D002474:Cell-Free System; D003090:Coliphages / Q000201:enzymology / Q000254:growth & development / Q000378:metabolism*; D003227:Conjugation, Genetic; D004267:DNA Viruses; D012321:DNA-Directed RNA Polymerases / Q000378:metabolism; D004926:Escherichia coli / Q000201:enzymology / Q000378:metabolism*; D005144:F Factor; D008242:Lysogeny; D009113:Muramidase / Q000096:biosynthesis; D009154:Mutation; D014176:Protein Biosynthesis; D012333:RNA, Messenger / Q000096:biosynthesis*; D012367:RNA, Viral / Q000096:biosynthesis*; D014158:Transcription, Genetic; D014764:Viral Proteins / Q000096:biosynthesis*; D014779:Virus Replication
chemical_list: D012333:RNA, Messenger; D012367:RNA, Viral; D014764:Viral Proteins; D012321:DNA-Directed RNA Polymerases; D009113:Muramidase