An adenylyl cyclase, CyaB, acts as an osmosensor in Myxococcus xanthus

Yoshio Kimura, Mika Ohtani, Kaoru Takegawa

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20 Citations (Scopus)


We have previously reported that a receptor-type adenylyl cyclase (CyaA) of Myxococcus xanthus undergoes an osmosensor mainly during spore germination (Y. Kimura et al., J. Bacteriol. 184:3578-3585, 2002). In the present study, we cloned another receptor-type adenylyl cyclase gene (cyaB) and characterized the function of the cyaB-encoded protein. Disruption of cyaB generates a mutant that showed growth retardation at high ionic (NaCl) or high nonionic (sucrose) osmolarity. When vegetative cells were stimulated with 0.15 M NaCl, the increases in intracellular cyclic AMP levels of cyaB mutant cells were lower than those of wild-type cells. Under nonionic osmostress, the cyaB mutant exhibited reduced spore germination; however, the germination rate of the cyaB mutant was significantly higher than that of the cyaA mutant.

Original languageEnglish
Pages (from-to)3593-3598
Number of pages6
JournalJournal of bacteriology
Issue number10
Publication statusPublished - May 2005
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Molecular Biology


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