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Cell division of Escherichia coli K-12 strain PA3092 was inhibited by the addition of adenosine 3',5'-phosphate (cAMP), and the cellular morphology was changed from rods into filaments. Nucleoids in the filaments were regularly distributed and septum formation was perfectly inhibited. This inhibition of cell division by cAMP was reversed by the addition of guanosine 3',5'-monophosphate. To examine whether the inhibitory effect of cAMP on cell division in E. coli PA3092 was specific, its effect in several parental strains was investigated. Induction of cell filamentation by cAMP was observed in E. coli PA309 and P678, but not in E. coli W505, W1, Y10, or the wild-type strain. This result suggests that filamentation by cAMP in E. coli PA3092, PA309, and P678 was due to the mutagenesis by which E. coli P678 was derived from E. coli W595.

Inhibitory effect of adenosine 3',5'-phosphate on cell division of Escherichia coli K-12 mutant derivatives