Flagella-mediated swimming and swarming motility in Salmonella enterica serovar Typhimurium is intercalated with the cyclic di-guanylate monophosphate (c-di-GMP) signalling network. In this study, we identified the GGDEF domain proteins STM2672, STM4551 and STM1987 as key di-guanylate cyclases involved in regulation of motility in a ΔyhjH phosphodiesterase gene deletion mutant with elevated c-di-GMP levels inhibiting motility. Surprisingly, these di-guanylate cyclases distinctively inhibited motility through the c-di-GMP receptors YcgR and the cellulose synthase BcsA, whereby STM2672 corresponded to YcgR, STM1987 to BcsA and STM4551 to both receptors. Although downregulation of motility is believed to prepare the bacterial cells for surface adhesion and biofilm formation, the major biofilm regulator CsgD of S. sv. Typhimurium was not involved in the regulation of swimming or swarming motility. Together with previously identified c-di-GMP networks regulating flagella-related phenotypes, flagella biosynthesis is a major target of c-di-GMP signalling in S. sv. Typhimurium.
In the originally published article by Le Guyon and colleagues (2014), the last sentence in the abstract read "Together with previously identified c-di-GMP networks regulating flagella-related phenotypes, flagella biosynthesis is a major target of c-di-GMP signalling in S. sv. Typhimurium."The correct sentence should have read "Together with previously identified c-di-GMP networks regulating flagellarelated phenotypes, flagella functionality is a major target of c-di-GMP signalling in S. sv. Typhimurium." Also, the name of author Mikael Rehn should read Mikael Rhen.
ReferenceLe Guyon, S., Simm, R., Rehn, M., and Römling, U. (2014) Dissecting the cyclic di-guanylate monophosphate signalling network regulating motility in Salmonella enterica serovar Typhimurium.
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