Letteratura scientifica selezionata sul tema "Phosphorelais EnvZ/OmpR"
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Articoli di riviste sul tema "Phosphorelais EnvZ/OmpR":
Sardesai, Abhijit A., e J. Gowrishankar. "trans-Acting Mutations in Loci Other than kdpDE That Affect kdp Operon Regulation inEscherichia coli: Effects of Cytoplasmic Thiol Oxidation Status and Nucleoid Protein H-NS on kdpExpression". Journal of Bacteriology 183, n. 1 (1 gennaio 2001): 86–93. http://dx.doi.org/10.1128/jb.183.1.86-93.2001.
Meng, Jiao, Jiaqi Bai, Junhong Xu, Can Huang e Jingyu Chen. "Differential regulation of physiological activities by RcsB and OmpR in Yersinia enterocolitica". FEMS Microbiology Letters 366, n. 17 (1 settembre 2019). http://dx.doi.org/10.1093/femsle/fnz210.
Li, Shuyu, Hong Liang, Zhiyan Wei, Haonan Bai, Mengyun Li, Qiqi Li, Meng Qu, Xihui Shen, Yao Wang e Lei Zhang. "An Osmoregulatory Mechanism Operating through OmpR and LrhA Controls the Motile-Sessile Switch in the Plant Growth-Promoting BacteriumPantoea alhagi". Applied and Environmental Microbiology 85, n. 10 (22 marzo 2019). http://dx.doi.org/10.1128/aem.00077-19.
Tesi sul tema "Phosphorelais EnvZ/OmpR":
Caby, Marine. "Rôle du phosphorelais EnvZ/OmpR chez la bactérie phytopathogène Dickeya dadantii". Thesis, Lille 1, 2020. http://www.theses.fr/2020LIL1S108.
During their lifetime, pathogenic bacteria are confronted with numerous environmental variations often referred to stress, particularly during infection. In order to survive and successfully colonize its host, the bacterium must perceive this new and dangerous environment to adapt quickly. This is the main role assigned to phosphorelays. These systems are composed of a sensor and a cognate regulator. Under the action of a stimulus, the sensor autophosphorylates and transmits the phosphate group to its regulator, which in turn modulates the activity of a set of target genes allowing adaptation to the new environment. Our experimental model Dickeya dadantii is a necrotrophic plant pathogen bacterium responsible for soft rot disease in a wide range of plant species. The variation of pH and osmolarity are two stresses often faced and fought by pathogenic bacteria. EnvZ/OmpR and RcsCDB phosphorelays are two major systems known to respond to these stresses. The laboratory had previously demonstrated that the level of activation of the RcsCDB system was dependent on the concentration of periplasmic osmoregulated glucans (OPG). Their concentration in the periplasm increases as the medium osmolarity decreases, making OPGs a major intermediate in the perception of osmolarity. This prompted us to decipher the relationship between EnvZ/OmpR and OPGs. I showed that, unlike for the activation of the RcsCDB system, the activation of EnvZ/OmpR doesn’t depend on the concentration of OPGs, but still requires its presence for proper activation of the phosphorelay. To go deeper into the EnvZ/OmpR system, activities of this system have been studied in vivo and in planta. While the EnvZ/OmpR system is activated in a medium with an acidic pH and a high osmolarity in E. coli, my work shows that only pH variation activates this phosphorelay in D. dadantii. In addition, only one major porin (versus two in E. coli) was previously detected in D. dadantii. My studies revealed the existence of a second porin expressed at acidic pH in vivo and in planta. These two OmpF-like porins are regulated by the pH via OmpR. After adaptation for a few hours in planta, the pattern of these two porines remains the same over the rest of the infection. However, the level of OmpR activation during the same period fluctuates indicating that at least one other environmental parameter modulates the activation of EnvZ/OmpR in planta. The steady state level of the porines in the envelope during this same period suggests that another regulatory system, perhaps RcsCDB may maintain their expression level
Cochard, Clémence. "Régulation fine du système EnvZ/OmpR chez Dickeya dadantii : clef d'une infection réussie". Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILS109.
Throughout their life, the bacteria must confront numerous environmental variations. They must adapt rapidly and effectively to ensure their survival. To accomplish this, they possess phosphorelays, or two-component systems, which are the major molecular tools enabling perception and adaptation to the environment in bacteria. These phosphorelays consist of a sensor and an associated regulator. Following the perception of a stimulus, the sensor autophosphorylates and transmits the phosphate group to the regulator, which then modulates the expression of the entire target gene set, known as a regulon. During the infection process, pathogenic bacteria must deal with multiple stresses. A significant number of these systems are found in various pathogenic bacteria, such as our study model Dickeya dadantii. Responsible for soft rot disease, D. dadantii is a wide-host-range phytopathogenic enterobacterium. It possesses a battery of 32 phosphorelays to deal with host defenses and the general stresses of nutritional deficiencies or physicochemical variations in the environment.First this study focuses on one of them, the EnvZ/OmpR system. My work initially shows that the pH in the plant remains acidic during infection. However, despite activation of the system by acidic pH, it is not activated during this process. To understand the reason for this inconsistency, the system's regulon was studied. It was then discovered that during the emergence of the Dickeya genus, the ompF gene, encoding the porin of the same name, was duplicated. Interestingly, the expression of ompF is constitutive, whereas that of ompF2, the duplicated gene, which is dependent on OmpR phosphorylation levels. The expression of this second porin is also detrimental to infection. Thus, during infection, the activation of EnvZ/OmpR is counteracted by the perception of host defense molecules to prevent the expression of ompF2 and enable proper virulence progression.In a second phase, a comprehensive study of the importance of each phosphorelay in D. dadantii's virulence was conducted in my work. The initial results show that only 6 systems are involved in virulence. The number and complexity of stresses encountered by pathogenic bacteria do not seem to align with this low number. Reducing the quantity of inoculated bacteria allowed for a more precise detection of the systems contributing to virulence, which now totals 12. Overall, these results indicate the significance of finely regulating the activity of a phosphorelay, as EnvZ/OmpR must be activated for infection, but this activation must be strongly controlled to avoid detrimental effects on virulence