Nucleotide sequences of the separate origins of synthesis of bacteriophage G4 viral and complementary DNA strands.
Bacteriophage G4 has physically separated origins of synthesis of its viral and complementary DNA strands. Chain termination and "plus and minus" DNA sequencing methods have been used to obtain the nucleotide sequence of these two origins. The unique origin at which the complementary DNA strand is initiated has located in the untranslated region between genes F and G. This sequence, which has considerable secondary structure, contains a stretch which is complementary to the RNA primer that is observed during synthesis in vitro of the G4 complementary DNA strand [Bouché, J.P., Rowen, L. & Kornberg, A. (1978) J. Biol. Chem., in press]. This G4 origin shows extensive sequence homology with the bacteriophage lambda origin of DNA replication [Denniston-Thompson, K., Moore, D. D., Kruger, D. E., Furth, M. E. & Blattner, F. R. (1977) Science 198, 1051-1056]. The sequence around the site in gene A at which G4 viral DNA strand synthesis is initiated by the nicking action of the cistron A protein is very similar to that of bacteriophage phiX174. An (A + T)-rich stretch flanked by (G + C)-rich sequences may be involved in the interaction between the DNA and protein.
D001435:Bacteriophages / Q000235:genetics*; D001483:Base Sequence; D002874:Chromosome Mapping; D003090:Coliphages / Q000235:genetics; D004261:DNA Replication; D004277:DNA, Single-Stranded / Q000235:genetics; D004279:DNA, Viral / Q000235:genetics*; D014779:Virus Replication
D004277:DNA, Single-Stranded; D004279:DNA, Viral
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