Abstract
Two kinds of hybridization competition experiments show that Bacillus subtilis RNA polymerase synthesizes ribosomal RNA (rRNA) in vitro with B. subtilis DNA as a template. First, RNA synthesized in vitro competes with the hybridization of [32P]rRNA synthesized in vivo to the heavy strand of B. subtilis DNA. Second, unlabeled rRNA synthesized in vivo competes with the hybridization of [3H]RNA synthesized in vitro to denatured DNA or heavy-strand DNA, but not to light-strand DNA. The ability of RNA polymerase holoenzyme to synthesize rRNA in vitro is not lost after extensive purification. RNA polymerase core enzyme, however, which is missing the σ factor, synthesizes little rRNA in vitro.
RNA polymerase purified from wild-type sporulating cells synthesizes little rRNA in vitro, while the in vitro synthesis of rRNA by RNA polymerase from stationary phase cells of the sporulation-defective mutant rfr 10 is apparently unimpaired.
Keywords: sporulation, hybridization, heavy strand of DNA
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