Post-translational regulation of the RpoS and PsrA genes in Pseudomonas putida WCS358: the role of ClpXP protease
Jovcic, B. | Begovic, J. | Lozo, J. | Topisirovic, Lj. | Kojic, M., Institute of Molecular Genetics and Genetic Engineering, Belgrade (Serbia)
The RpoS and PsrA proteins are key transcriptional regulators that are activated in response to the stationary phase of growth in pseudomonads. This study was designed to establish whether ClpXP (ATP-dependent serine protease) regulates levels of RpoS and PsrA in Pseudomonas putida WCS358. Western blot analysis of P. putida WCS358 protein extracts from the early exponential, late exponential, and stationary phases of growth with antibodies against RpoS and PsrA revealed that these proteins are degraded by ClpXP in the early exponential phase of growth. The obtained results demonstrate a role for ClpXP protease in post-translational regulation of proteins encoded by the rpoS and psrA genes in Pseudomonas sp.
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