View source for 5mbq


==CeuE (H227A variant) a periplasmic protein from Campylobacter jejuni==
<StructureSection load='5mbq' size='340' side='right'caption='[[5mbq]], [[Resolution|resolution]] 1.33&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5mbq]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Campylobacter_jejuni Campylobacter jejuni]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5MBQ OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5MBQ 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]] 1.33&#8491;</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=5mbq FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5mbq OCA], [https://pdbe.org/5mbq PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5mbq RCSB], [https://www.ebi.ac.uk/pdbsum/5mbq PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5mbq ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/Q0P8Q4_CAMJE Q0P8Q4_CAMJE] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Bacteria use siderophores to mediate the transport of essential Fe(III) into the cell. In Campylobacter jejuni the periplasmic binding protein CeuE, an integral part of the Fe(III) transport system, has adapted to bind tetradentate siderophores using a His and a Tyr side chain to complete the Fe(III) coordination. A series of tetradentate siderophore mimics was synthesized in which the length of the linker between the two iron-binding catecholamide units was increased from four carbon atoms (4-LICAM4-) to five, six and eight (5-, 6-, 8-LICAM4-, respectively). Co-crystal structures with CeuE showed that the inter-planar angles between the iron-binding catecholamide units in the 5-, 6- and 8-LICAM4- structures are very similar (111 degrees , 110 degrees and 110 degrees ) and allow for an optimum fit into the binding pocket of CeuE, the inter-planar angle in the structure of 4-LICAM4- is significantly smaller (97 degrees ) due to restrictions imposed by the shorter linker. Accordingly, the protein-binding affinity was found to be slightly higher for 5- compared to 4-LICAM4- but decreases for 6- and 8-LICAM4-. The optimum linker length of five matches that present in natural siderophores such as enterobactin and azotochelin. Site-directed mutagenesis was used to investigate the relative importance of the Fe(III)-coordinating residues H227 and Y288.

Interactions of the periplasmic binding protein CeuE with Fe(III) n-LICAM4- siderophore analogues of varied linker length.,Wilde EJ, Hughes A, Blagova EV, Moroz OV, Thomas RP, Turkenburg JP, Raines DJ, Duhme-Klair AK, Wilson KS Sci Rep. 2017 Apr 6;7:45941. doi: 10.1038/srep45941. PMID:28383577<ref>PMID:28383577</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5mbq" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Campylobacter jejuni]]
[[Category: Large Structures]]
[[Category: Blagova EV]]
[[Category: Duhme-Klair A-K]]
[[Category: Hughes A]]
[[Category: Moroz OV]]
[[Category: Raines DJ]]
[[Category: Turkenburg JP]]
[[Category: Wilde EJ]]
[[Category: Wilson KS]]