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Experiments were carried out to determine whether, during outgrowth of bacterial spores, deoxyribonucleic acid (DNA) replication provided the basis by which ordered transcription was controlled. During outgrowth, significant DNA synthesis does not occur until just prior to the onset of cell division. However, incorporation of radioactive DNA precursors into DNA is observed within 5 to 10 min after the initiation of germination. By employing a thymine-requiring auxotroph and (3)H-bromodeoxyuridine, this incorporation appears to be a result of DNA replication and not repair synthesis. For the following reasons it was concluded that, during outgrowth, transcriptional processes were not ordered by DNA replication. (i) In a thymine auxotroph, thymine addition did not alter the periodicity of induced alpha-glucosidase and histidase synthesis during outgrowth. (ii) DNA synthesis was inhibited 80% by 5-fluoro-2'-deoxyuridine (FUdR), and, after a 5-min lag, completely by mitomycin C, but these inhibitors exerted a differential effect on induced histidase synthesis. Enzyme synthesis was insensitive to FUdR but was inhibited by mitomycin C, presumably as a result of cross-linking of the complementary DNA strands.

journal of bacteriology

Timing of Enzyme Synthesis During Outgrowth of Spores of <i>Bacillus cereus</i> II. Relationship Between Ordered Enzyme Synthesis and Deoxyribonucleic Acid Replication

Timing of Enzyme Synthesis During Outgrowth of Spores of Bacillus cereus II. Relationship Between Ordered Enzyme Synthesis and Deoxyribonucleic Acid Replication