4yna

Structural highlights

Function

YFIR_PSEAE Negatively regulates the activity of the diguanylate cyclase TpbB/YfiN, leading to decreased c-di-GMP production (PubMed:20300602). Inhibits TpbB/YfiN allosterically, through a hydrophobic interaction between the C-terminus of YfiR and a conserved region of the periplasmic PAS domain of TpbB/YfiN (PubMed:22719254). Under reducing conditions, may also act as an YfiB-independent sensing device that is able to activate TpbB/YfiN in response to the redox status of the periplasm (PubMed:22719254).^{[1] [2]} Part of the YfiB-TpbB-YfiR (or yfiBNR) system, encoding a tripartite signaling module that modulates intracellular c-di-GMP levels (PubMed:20300602, PubMed:22719254). The system is a key regulator of the small colony variant (SCV) phenotype, and plays an important role in biofilm formation and in vivo persistence (PubMed:20300602). The c-di-GMP produced by TpbB/YfiN stimulates the production of the Pel and Psl exopolysaccharides, which promotes surface attachment, generates an SCV phenotype and confers resistance against phagocytosis (PubMed:20300602).^{[3] [4]}

References

1. ↑ Malone JG, Jaeger T, Spangler C, Ritz D, Spang A, Arrieumerlou C, Kaever V, Landmann R, Jenal U. YfiBNR mediates cyclic di-GMP dependent small colony variant formation and persistence in Pseudomonas aeruginosa. PLoS Pathog. 2010 Mar 12;6(3):e1000804. PMID:20300602 doi:10.1371/journal.ppat.1000804
2. ↑ Malone JG, Jaeger T, Manfredi P, Dötsch A, Blanka A, Bos R, Cornelis GR, Häussler S, Jenal U. The YfiBNR signal transduction mechanism reveals novel targets for the evolution of persistent Pseudomonas aeruginosa in cystic fibrosis airways. PLoS Pathog. 2012;8(6):e1002760. PMID:22719254 doi:10.1371/journal.ppat.1002760
3. ↑ Malone JG, Jaeger T, Spangler C, Ritz D, Spang A, Arrieumerlou C, Kaever V, Landmann R, Jenal U. YfiBNR mediates cyclic di-GMP dependent small colony variant formation and persistence in Pseudomonas aeruginosa. PLoS Pathog. 2010 Mar 12;6(3):e1000804. PMID:20300602 doi:10.1371/journal.ppat.1000804
4. ↑ Malone JG, Jaeger T, Manfredi P, Dötsch A, Blanka A, Bos R, Cornelis GR, Häussler S, Jenal U. The YfiBNR signal transduction mechanism reveals novel targets for the evolution of persistent Pseudomonas aeruginosa in cystic fibrosis airways. PLoS Pathog. 2012;8(6):e1002760. PMID:22719254 doi:10.1371/journal.ppat.1002760
5. ↑ Yang X, Yang XA, Xu M, Zhou L, Fan Z, Jiang T. Crystal structures of YfiR from Pseudomonas aeruginosa in two redox states. Biochem Biophys Res Commun. 2015 Apr 4. pii: S0006-291X(15)00628-2. doi:, 10.1016/j.bbrc.2015.03.160. PMID:25849887 doi:http://dx.doi.org/10.1016/j.bbrc.2015.03.160