View source for 1by5


==FHUA FROM E. COLI, WITH ITS LIGAND FERRICHROME==
<StructureSection load='1by5' size='340' side='right'caption='[[1by5]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1by5]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Escherichia_coli Escherichia coli] and [https://en.wikipedia.org/wiki/Ustilago_sphaerogena Ustilago sphaerogena]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1BY5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1BY5 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]] 2.6&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=AHO:N-ACETYL-N-HYDROXY-L-ORNITHINE'>AHO</scene>, <scene name='pdbligand=FE:FE+(III)+ION'>FE</scene>, <scene name='pdbligand=OES:N-OCTYL-2-HYDROXYETHYL+SULFOXIDE'>OES</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=1by5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1by5 OCA], [https://pdbe.org/1by5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1by5 RCSB], [https://www.ebi.ac.uk/pdbsum/1by5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1by5 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/by/1by5_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.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=1by5 ConSurf].
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== Publication Abstract from PubMed ==
FhuA protein facilitates ligand-gated transport of ferrichrome-bound iron across Escherichia coli outer membranes. X-ray analysis at 2.7 A resolution reveals two distinct conformations in the presence and absence of ferrichrome. The monomeric protein consists of a hollow, 22-stranded, antiparallel beta barrel (residues 160-714), which is obstructed by a plug (residues 19-159). The binding site of ferrichrome, an aromatic pocket near the cell surface, undergoes minor changes upon association with the ligand. These are propagated and amplified across the plug, eventually resulting in substantially different protein conformations at the periplasmic face. Our findings reveal the mechanism of signal transmission and suggest how the energy-transducing TonB complex senses ligand binding.

Transmembrane signaling across the ligand-gated FhuA receptor: crystal structures of free and ferrichrome-bound states reveal allosteric changes.,Locher KP, Rees B, Koebnik R, Mitschler A, Moulinier L, Rosenbusch JP, Moras D Cell. 1998 Dec 11;95(6):771-8. PMID:9865695<ref>PMID:9865695</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 1by5" 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: Ustilago sphaerogena]]
[[Category: Koebnik R]]
[[Category: Locher KP]]
[[Category: Mitschler A]]
[[Category: Moras D]]
[[Category: Moulinier L]]
[[Category: Rees B]]
[[Category: Rosenbusch JP]]