Project description:The entire set of flagellar structural components and flagellar-specific transcriptional regulators, as well as much of the core chemotaxis machinery, is encoded into a >70 kbp cluster in Pseudomonas putida KT2440 genome. We have performed RNA-seq of the wild-type strain in order to identify operon boundaries and promoters location in this cluster.
Project description:KaiC is the central cog of the circadian clock in Cyanobacteria. Close homologs of this protein are widespread among bacteria not known to have a circadian physiology. The function, interaction network, and mechanism of action of these KaiC homologs are still largely unknown. Here, we focus on KaiC homologs found in environmental Pseudomonas species. We characterize experimentally the only KaiC homolog present in Pseudomonas putida KT2440 and Pseudomonas protegens CHA0. Through phenotypic assays and transcriptomics, we show that KaiC is involved in osmotic and oxidative stress resistance in P. putida and in biofilm production in both P. putida and P. protegens.
Project description:The sigma factor FliA (σ28) has been described to activate the expression of several chemoreceptor-encoding genes and the late flagellar genes in Pseudomonas putida, enabling synthesis of the filament, an stator complex and completion of the flagella-associated chemotaxis machinery. The activity of FliA is repressed in the cytoplasm by the anti-sigma factor FlgM upon completion of the flagellar hook. In this study we aim to identify genome-wide targets of regulation by FliA in P. putida KT2442 (a spontaneous rifampicin-resistant mutant of the reference strain KT2440) by performing RNA-seq experiments using a fliA deletion mutant and a constitutively active strain that combines the deletion of flgM with ectopic production of FliA.
