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Involvement of cyclic AMP and its receptor protein in filamentation of an Escherichia coli fic mutant.

ABSTRACT

Cyclic AMP (cAMP) inhibited septum formation in Escherichia coli PA3092 and induced cell filamentation at elevated temperatures. This phenomenon was first observed in E. coli PA3092 and is due to a temperature-sensitive mutation. We tentatively named this mutation fic (filamentation induced by cAMP). The fic gene was located near rpsL (formerly strA) on the E. coli K-12 map. the inhibitory effect of cAMP on cell division and filamentation in a fic mutant was not observed in a crp mutant. When cAMP was removed from the culture medium, filaments were divided into rods as the intracellular cAMP level decreased. These results suggest that the cAMP-cAMP receptor protein complex causes filamentation in the fic mutant, E. coli PA3092.

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