View source for 4yna


==Oxidized YfiR==
<StructureSection load='4yna' size='340' side='right'caption='[[4yna]], [[Resolution|resolution]] 3.20&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[4yna]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Pseudomonas_aeruginosa_PAO1 Pseudomonas aeruginosa PAO1]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4YNA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4YNA FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3.2&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=SO4:SULFATE+ION'>SO4</scene></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4yna FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4yna OCA], [https://pdbe.org/4yna PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4yna RCSB], [https://www.ebi.ac.uk/pdbsum/4yna PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4yna ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/YFIR_PSEAE 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).<ref>PMID:20300602</ref> <ref>PMID:22719254</ref>   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).<ref>PMID:20300602</ref> <ref>PMID:22719254</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
YfiBNR is a recently identified c-di-GMP regulatory system involved in bacterial biofilm formation. The periplasmic protein YfiR inhibits the diguanylate cyclase activity of the inner membrane protein YfiN, whereas YfiB in the outer membrane can release this inhibition by sequestration of YfiR. In addition, this system may respond to anoxic conditions via YfiR, although the detailed mechanism is still unknown. Here we report crystal structures of Pseudomonas aeruginosa YfiR in the absence and presence of oxidative glutathione. Our structures reveal the overall folding of YfiR for the first time and demonstrate that YfiR exist as a dimer. Comparison of the two structures in different redox states revealed a broken/formation of one disulfide bond (Cys71-Cys110) and local conformational change around the other one (Cys145-Cys152). Mutagenesis studies indicated that Cys145-Cys152 plays an important role in maintaining the correct folding of YfiR.

Crystal structures of YfiR from Pseudomonas aeruginosa in two redox states.,Yang X, Yang XA, Xu M, Zhou L, Fan Z, Jiang T Biochem Biophys Res Commun. 2015 Apr 4. pii: S0006-291X(15)00628-2. doi:, 10.1016/j.bbrc.2015.03.160. PMID:25849887<ref>PMID:25849887</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4yna" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Large Structures]]
[[Category: Pseudomonas aeruginosa PAO1]]
[[Category: Jiang T]]
[[Category: Xu M]]