The role of cAMP in flagellation of Salmonella typhimurium |
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Authors: | Yoshibumi Komeda Hideho Suzuki Jun-ichi Ishidsu Tetsuo Iino |
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Affiliation: | (1) Laboratory of Genetics, Faculty of Science, University of Tokyo, Hongo, Tokyo, Japan;(2) Present address: National Institute of Genetics, Mishima, Japan |
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Abstract: | Summary A mutational alteration either in adenylate cyclase (cya-) or in cyclic-3 5 -AMP (cAMP) receptor protein (crp-) rendered Salmonella typhimurium incapable of producing flagella. The amount of mRNA specific for flagellin in these mutants was almost negligible when assayed in an in vitro protein synthesizing system. A secondary mutation, cfs, partially suppressing the cya- mutation, was identified among the revertants of cya-. A mutation in the same cistron as cfs resulted in a non-flagellate phenotype either by itself or in combination with cfs. The cistron, which was given the gene symbol flaT, was located between flaE and flaL. It was suggested that cAMP receptor protein together with cAMP modulates the gene flaT, which in turn acts as a positive effector on the synthesis of active mRNA specific for flagellin. |
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