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A defectiverecA gene, which is involved in recombination, is shown in this article to permit limited cell division, when deoxyribonucleic acid (DNA) synthesis is blocked. Thymidine starvation or nalidixic acid blocked DNA synthesis, and stopped cell division of arec + thy − strain ofEscherichia coli . However, with the same treatments, arecA thy − strain could continue to divide for at least 5 hr, and cell numbers increased 2.5- to 4-fold. After several hours of thymidine starvation, the culture contained very long cells (snakes) and small (normal-sized) cells. The short cells contained very little, if any, DNA. Cells of all ages divided in the absence of thymidine. Specific differences in membrane proteins were observed between thymidine-starvedrec + andrecA cells, as expected from previous experiments in which these proteins were associated with cell division and DNA synthesis. It is proposed that septum formation is controlled negatively by therecA + gene.

Pleiotropic Effect of the recA Gene of Escherichia coli: Uncoupling of Cell Division from Deoxyribonucleic Acid Replication