View source for 1qfg


==E. COLI FERRIC HYDROXAMATE RECEPTOR (FHUA)==
<StructureSection load='1qfg' size='340' side='right'caption='[[1qfg]], [[Resolution|resolution]] 2.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1qfg]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1QFG OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1QFG 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]] 2.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=DAO:LAURIC+ACID'>DAO</scene>, <scene name='pdbligand=DDQ:DECYLAMINE-N,N-DIMETHYL-N-OXIDE'>DDQ</scene>, <scene name='pdbligand=DPO:DIPHOSPHATE'>DPO</scene>, <scene name='pdbligand=FTT:3-HYDROXY-TETRADECANOIC+ACID'>FTT</scene>, <scene name='pdbligand=GCN:3-DEOXY-D-GLUCOSAMINE'>GCN</scene>, <scene name='pdbligand=GLA:ALPHA+D-GALACTOSE'>GLA</scene>, <scene name='pdbligand=GLC:ALPHA-D-GLUCOSE'>GLC</scene>, <scene name='pdbligand=GMH:L-GLYCERO-D-MANNO-HEPTOPYRANOSE'>GMH</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=KDO:3-DEOXY-D-MANNO-OCT-2-ULOSONIC+ACID'>KDO</scene>, <scene name='pdbligand=MYR:MYRISTIC+ACID'>MYR</scene>, <scene name='pdbligand=NI:NICKEL+(II)+ION'>NI</scene>, <scene name='pdbligand=PA1:2-AMINO-2-DEOXY-ALPHA-D-GLUCOPYRANOSE'>PA1</scene>, <scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</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=1qfg FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1qfg OCA], [https://pdbe.org/1qfg PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1qfg RCSB], [https://www.ebi.ac.uk/pdbsum/1qfg PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1qfg ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/FHUA_ECOLI FHUA_ECOLI] This receptor binds the ferrichrome-iron ligand. It interacts with the TonB protein, which is responsible for energy coupling of the ferrichrome-promoted iron transport system. Acts as a receptor for bacteriophage T5 as well as T1, phi80 and colicin M. Binding of T5 triggers the opening of a high conductance ion channel. Can also transport the antibiotic albomycin.<ref>PMID:8617231</ref> 
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/qf/1qfg_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1qfg ConSurf].
<div style="clear:both"></div>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
BACKGROUND: Lipopolysaccharide (LPS), a lipoglycan from the outer membrane of Gram-negative bacteria, is an immunomodulatory molecule that stimulates the innate immune response. High levels of LPS cause excessive release of inflammatory mediators and are responsible for the septic shock syndrome. The interaction of LPS with its cognate binding proteins has not, as yet, been structurally elucidated. RESULTS: The X-ray crystallographic structure of LPS in complex with the integral outer membrane protein FhuA from Escherichia coli K-12 is reported. It is in accord with data obtained using mass spectroscopy and nuclear magnetic resonance. Most of the important hydrogen-bonding or electrostatic interactions with LPS are provided by eight positively charged residues of FhuA. Residues in a similar three-dimensional arrangement were searched for in all structurally known proteins using a fast template-matching algorithm, and a subset of four residues was identified that is common to known LPS-binding proteins. CONCLUSIONS: These four residues, three of which form specific interactions with lipid A, appear to provide the structural basis of pattern recognition in the innate immune response. Their arrangement can serve to identify LPS-binding sites on proteins known to interact with LPS, and could serve as a template for molecular modeling of a LPS scavenger designed to reduce the septic shock syndrome.

A conserved structural motif for lipopolysaccharide recognition by procaryotic and eucaryotic proteins.,Ferguson AD, Welte W, Hofmann E, Lindner B, Holst O, Coulton JW, Diederichs K Structure. 2000 Jun 15;8(6):585-92. PMID:10873859<ref>PMID:10873859</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
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<div class="pdbe-citations 1qfg" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ferric hydroxamate uptake receptor|Ferric hydroxamate uptake receptor]]
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Escherichia coli]]
[[Category: Large Structures]]
[[Category: Coulton JW]]
[[Category: Diederichs K]]
[[Category: Ferguson AD]]
[[Category: Hofmann E]]
[[Category: Holst O]]
[[Category: Lindner B]]
[[Category: Welte W]]