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== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[4lfu]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LFU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4LFU FirstGlance]. <br>
<table><tr><td colspan='2'>[[4lfu]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli_K-12 Escherichia coli K-12]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4LFU OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4LFU FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene></td></tr>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.26&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</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=4lfu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4lfu OCA], [https://pdbe.org/4lfu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4lfu RCSB], [https://www.ebi.ac.uk/pdbsum/4lfu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4lfu ProSAT]</span></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=4lfu FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4lfu OCA], [https://pdbe.org/4lfu PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4lfu RCSB], [https://www.ebi.ac.uk/pdbsum/4lfu PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4lfu ProSAT]</span></td></tr>
</table>
</table>
== Function ==
== Function ==
[https://www.uniprot.org/uniprot/SDIA_ECOLI SDIA_ECOLI] Activates cell division by specifically increasing transcription from one of the two promoters that lie immediately upstream of the ftsQAZ gene cluster. Activates ydiV expression in response to extracellular autoinducer AI-1 (Vibrio fischeri autoinducer oxoC6).<ref>PMID:1915297</ref> <ref>PMID:18560382</ref>  
[https://www.uniprot.org/uniprot/SDIA_ECOLI SDIA_ECOLI] Activates cell division by specifically increasing transcription from one of the two promoters that lie immediately upstream of the ftsQAZ gene cluster. Activates ydiV expression in response to extracellular autoinducer AI-1 (Vibrio fischeri autoinducer oxoC6).<ref>PMID:1915297</ref> <ref>PMID:18560382</ref>  
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Escherichia coli SdiA is a quorum-sensing (QS) receptor that responds to autoinducers produced by other bacterial species to control cell division and virulence. Crystal structures reveal that E. coli SdiA, which is composed of an N-terminal ligand-binding domain and a C-terminal DNA-binding domain (DBD), forms a symmetrical dimer. Although each domain shows structural similarity to other QS receptors, SdiA differs from them in the relative orientation of the two domains, suggesting that its ligand-binding and DNA-binding functions are independent. Consistently, in DNA gel-shift assays the binding affinity of SdiA for the ftsQP2 promoter appeared to be insensitive to the presence of autoinducers. These results suggest that autoinducers increase the functionality of SdiA by enhancing the protein stability rather than by directly affecting the DNA-binding affinity. Structural analyses of the ligand-binding pocket showed that SdiA cannot accommodate ligands with long acyl chains, which was corroborated by isothermal titration calorimetry and thermal stability analyses. The formation of an intersubunit disulfide bond that might be relevant to modulation of the DNA-binding activity was predicted from the proximal position of two Cys residues in the DBDs of dimeric SdiA. It was confirmed that the binding affinity of SdiA for the uvrY promoter was reduced under oxidizing conditions, which suggested the possibility of regulation of SdiA by multiple independent signals such as quorum-sensing inducers and the oxidation state of the cell.
Structural insights into the molecular mechanism of Escherichia coli SdiA, a quorum-sensing receptor.,Kim T, Duong T, Wu CA, Choi J, Lan N, Kang SW, Lokanath NK, Shin D, Hwang HY, Kim KK Acta Crystallogr D Biol Crystallogr. 2014 Mar;70(Pt 3):694-707. doi:, 10.1107/S1399004713032355. Epub 2014 Feb 15. PMID:24598739<ref>PMID:24598739</ref>
From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 4lfu" style="background-color:#fffaf0;"></div>
== References ==
== References ==
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