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The relationship between chromosome replication and cell division in the stalked bacterium Caulobacter crescentus has been investigated. Two compounds, hydroxyurea and mitomycin C, were found to inhibit completely deoxyribonucleic acid (DNA) synthesis while allowing continued cell growth and elongation. When these inhibitors were added to exponentially growing cultures, cell division stopped after 38 min when hydroxyurea was used and after 33 min when mitomycin C was used. The period of continued cell division corresponds closely to the period previously determined for the postsynthetic gap (G2) in the DNA cycle of this organism. These results indicate that cell division is coupled to the completion of chromosome replication in C. crescentus.

Dependence of Cell Division on the Completion of Chromosome Replication in Caulobacter crescentus