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- W2098614645 abstract "The φ29 early mRNA's synthesized in infected Bacillus subtilis were studied by using sedimentation velocity analysis, polyacrylamide gel electrophoresis, and hybridization of φ29 DNA fragments generated by the restriction endonuclease Eco RI. Viral RNAs synthesized in vivo in the resence of chloramphenicol were found to hybridize to Eco RI-A, -C, and -D fragments, but not to Eco RI-B and -E fragments, of the viral genome. Major early mRNA sedimenting as 16 S material in neutral sucrose gradients was examined in detail. Radioactive φ29 RNA, purified by sucrose gradient centrifugation, was hybridized to either the Eco RI-A or Eco RI-C DNA fragment. The RNA was eluted from the hybrids and then tested for complementary hybrid formation with Eco RI-A and -C fragments. RNA eluted from the Eco RI-A fragment annealed only to the Eco RI-A fragment and not to the Eco RI-C fragment. Similarly, RNA eluted from the Eco RI-C fragment hybridized to the Eco RI-C and -D fragments. Viral RNAs synthesized in vitro using B. subtilis RNA polymerase hybridized to both Eco RI-A and -C DNA fragments. Furthermore, RNA initiated with [γ- 32 P]GTP also hybridized to both Eco RI-A and -C fragments. These results indicate that there are at least two efficient promotors for early transcription on the φ29 chromosome. In addition, a low-molecular-weight RNA initiated with [γ- 32 P]ATP was found to hybridize exclusively with the Eco RI-A fragment. Kinetic studies of φ29 mRNA synthesis during the lytic cycle have shown that viral RNAs hybridizable to the Eco RI-A and -C fragments are synthesized immediately after phage infection. On the other hand, mRNA specific for the Eco RI-B fragment was not synthesized for several minutes after phage infection. Based on the results of the in vivo and in vitro transcription studies, a transcription map of the φ29 chromosome is proposed." @default.
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- W2098614645 date "1977-09-01" @default.
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- W2098614645 title "Transcription of the Genome of Bacteriophage φ29: Isolation and Mapping of the Major Early mRNA Synthesized In Vivo and In Vitro" @default.
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- W2098614645 doi "https://doi.org/10.1128/jvi.23.3.562-577.1977" @default.
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