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Dissecting the cyclic di‐guanylate monophosphate signalling network regulating motility in S almonella enterica serovar T yphimurium
Author(s) -
Le Guyon Soazig,
Simm Roger,
Rehn Mikael,
Römling Ute
Publication year - 2015
Publication title -
environmental microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.954
H-Index - 188
eISSN - 1462-2920
pISSN - 1462-2912
DOI - 10.1111/1462-2920.12580
Subject(s) - motility , biology , biofilm , microbiology and biotechnology , swarming motility , flagellum , mutant , receptor , biochemistry , bacteria , gene , quorum sensing , genetics
Summary Flagella‐mediated swimming and swarming motility in S almonella enterica serovar T yphimurium 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 Δ yhjH 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. T yphimurium 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. T yphimurium.