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Linear density gradients of Renografin have resolved two components of bacterial deoxyribonucleic acid (DNA) in sheared lysates. Component 1, at equilibrium density after 5 hr of centrifugation, is enriched for newly synthesized DNA and markers near the origin and terminus of replication. It contains 5% of total cellular protein, 25% of the phospholipids, 30 to 50% of the DNA, 4 to 11% of unstable ribonucleic acid (RNA), RNA polymerase, and low amounts of DNA polymerase. The material is sensitive to Pronase and Sarkosyl. In unsheared lysates, all of the DNA forms a band at this position. Shearing the lysate generates a slow-sedimenting fraction of DNA (component 2) which contains more uniformly labeled than newly synthesized DNA. These observations suggest that replicating DNA and DNA at the origin and possibly the terminus of replication are associated with membrane. The amount of uniformly labeled DNA in component 1 and an estimate of the number of chromosomal fragments suggest that other parts of the chromosome are possibly associated with the membrane.

journal of bacteriology

Association of the <i>Bacillus subtilis</i> Chromosome with the Cell Membrane: Resolution of Free and Bound Deoxyribonucleic Acid on Renografin Gradients

Association of the Bacillus subtilis Chromosome with the Cell Membrane: Resolution of Free and Bound Deoxyribonucleic Acid on Renografin Gradients