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• W3036559172 endingPage "144883" @default.
• W3036559172 startingPage "144883" @default.
• W3036559172 abstract "The anti-anti-sigma factor BldG has a pleiotropic function in Streptomyces coelicolor A3(2), regulating both morphological and physiological differentiation. Together with the anti-sigma factor UshX, it participates in a partner-switching activation of the sigma factor σH, which has a dual role in the osmotic stress response and morphological differentiation in S. coelicolor A3(2). In addition to UshX, BldG also interacts with the anti-sigma factor ApgA, although no target sigma factor has yet been identified. However, neither UshX nor ApgA phosphorylates BldG. This phosphorylation is provided by the anti-sigma factor RsfA, which is specific for the late developmental sigma factor σF. However, BldG is phosphorylated in the rsfA mutant, suggesting that some other anti-sigma factors containing HATPase_c kinase domain are capable to phosphorylate BldG in vivo. Bacterial two-hybrid system (BACTH) was therefore used to investigate the interactions of all suitable anti-sigma factors of S. coelicolor A3(2) with BldG. At least 15 anti-sigma factors were found to interact with BldG. These interactions were confirmed by native PAGE. In addition to RsfA, BldG is specifically phosphorylated on the conserved phosphorylation Ser57 residue by at least seven additional anti-sigma factors. However, only one of them, SCO7328, has been shown to interact with three sigma factors, σG, σK and σM. A mutant with deleted SCO7328 gene was prepared in S. coelicolor A3(2), however, no specific function of SCO7328 in growth, differentiation or stress response could be attributed to this anti-sigma factor. These results suggest that BldG is specifically phosphorylated by several anti-sigma factors and it plays a role in the regulation of several sigma factors in S. coelicolor A3(2). This suggests a complex regulation of the stress response and differentiation in S. coelicolor A3(2) through this pleiotropic anti-sigma factor." @default.
• W3036559172 created "2020-06-25" @default.
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• W3036559172 date "2020-09-01" @default.
• W3036559172 modified "2023-10-12" @default.
• W3036559172 title "Pleiotropic anti-anti-sigma factor BldG is phosphorylated by several anti-sigma factor kinases in the process of activating multiple sigma factors in Streptomyces coelicolor A3(2)" @default.
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• W3036559172 doi "https://doi.org/10.1016/j.gene.2020.144883" @default.
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