Abstract:Folded chromosomes were isolated from Escherichia coli thermosensitive dnaA initiation mutants incubated at the nonpermissive temperature and were analyzed by neutral sucrose density gradient centrifugation. A chromosomal structure that sedimented at approximately 1,500S accumulated when the dnaA gene product was inactive. When the cells were returned to a permissive temperature, the folded chromosomes exhibited a decrease in sedimentation velocity to 1,300S but still retained their uniform structure. Very lit… Show more
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