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. 1978 Feb;25(2):616–629. doi: 10.1128/jvi.25.2.616-629.1978

Translation of RNAs Synthesized In Vivo and In Vitro from Bacteriophage SP82 DNA

William R Hiatt 1, H R Whiteley 1
PMCID: PMC353975  PMID: 415151

Abstract

The synthesis of 69 phage-specific polypeptides during the infection of Bacillus subtilis with bacteriophage SP82 was detected by pulse-labeling, one-dimensional electrophoresis, and autoradiography. SP82 virions were found to contain approximately 22 polypeptides, most of which were synthesized late in infection; evidence was obtained for the processing of the major virion protein. RNAs extracted at different times during infection were translated by using an Escherichia coli cell-free extract. Only smaller-molecular-weight peptides were produced efficiently in vitro; in the 9,000- to 60,000-molecular-weight range, 50 to 60% of the peptides synthesized in vivo were produced by translation of RNAs extracted from infected cells. Eight of the virion peptides were produced by in vitro translation of RNAs extracted from infected cells. RNAs were synthesized under defined conditions by RNA polymerase extracted from uninfected B. subtilis and by polymerases isolated from cells 8 and 20 min after infection with SP82. Translation of these RNAs yielded characteristic and different patterns of polypeptides. Nine of the 12 polypeptides produced by translation of RNAs synthesized by the host polymerase corresponded in mobility to peptides appearing in vivo in the 0 to 3 and 3 to 6 min intervals of pulse-labeling after infection; 12 of the 25 peptides synthesized from RNAs produced by polymerase extracted 8 min after infection corresponded in mobility to peptides detected in vivo 8 min after infection, and 15 of the 22 peptides directed by RNAs made by the polymerase isolated 20 min after infection corresponded to peptides present in vivo late in infection. Five of the peptides produced in vitro from the latter RNA corresponded to virion peptides.

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