View source for 6au5


==Structure of cetuximab with aminoheptanoic acid-linked n-butylarginine meditope variant==
<StructureSection load='6au5' size='340' side='right'caption='[[6au5]], [[Resolution|resolution]] 2.48&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[6au5]] is a 6 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens], [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6AU5 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=6AU5 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]] 2.484&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=ACA:6-AMINOHEXANOIC+ACID'>ACA</scene>, <scene name='pdbligand=BWV:N~5~-(N-butylcarbamimidoyl)-L-ornithine'>BWV</scene>, <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=6au5 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6au5 OCA], [https://pdbe.org/6au5 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=6au5 RCSB], [https://www.ebi.ac.uk/pdbsum/6au5 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=6au5 ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/IGKC_HUMAN IGKC_HUMAN] Defects in IGKC are the cause of immunoglobulin kappa light chain deficiency (IGKCD) [MIM:[https://omim.org/entry/614102 614102]. IGKCD is a disease characterized by the complete absence of immunoglobulin kappa chains.<ref>PMID:3931219</ref> 
== Function ==
[https://www.uniprot.org/uniprot/IGKC_HUMAN IGKC_HUMAN] 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Meditope, a cyclic 12-residue peptide, binds to a unique binding side between the light and heavy chains of the cetuximab Fab. In an effort to improve the affinity of the interaction, it was sought to extend the side chain of Arg8 in the meditope, a residue that is accessible from the other side of the meditope binding site, in order to increase the number of interactions. These modifications included an n-butyl and n-octyl extension as well as hydroxyl, amine and carboxyl substitutions. The atomic structures of the complexes and the binding kinetics for each modified meditope indicated that each extension threaded through the Fab `hole' and that the carboxyethylarginine substitution makes a favorable interaction with the Fab, increasing the half-life of the complex by threefold compared with the unmodified meditope. Taken together, these studies provide a basis for the design of additional modifications to enhance the overall affinity of this unique interaction.

Meditope-Fab interaction: threading the hole.,Bzymek KP, Ma Y, Avery KN, Horne DA, Williams JC Acta Crystallogr F Struct Biol Commun. 2017 Dec 1;73(Pt 12):688-694. doi:, 10.1107/S2053230X17016272. Epub 2017 Nov 18. PMID:29199990<ref>PMID:29199990</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 6au5" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Synthetic construct]]
[[Category: Bzymek KP]]
[[Category: Williams JC]]