View source for 5vm6


==The hapten triclocarban bound to the single domain camelid nanobody VHH T10==
<StructureSection load='5vm6' size='340' side='right'caption='[[5vm6]], [[Resolution|resolution]] 1.50&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5vm6]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Lama_glama Lama glama]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5VM6 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5VM6 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]] 1.5&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=9EG:N-(4-chlorophenyl)-N-(3,4-dichlorophenyl)urea'>9EG</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</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=5vm6 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5vm6 OCA], [https://pdbe.org/5vm6 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5vm6 RCSB], [https://www.ebi.ac.uk/pdbsum/5vm6 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5vm6 ProSAT]</span></td></tr>
</table>
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== Publication Abstract from PubMed ==
The variable VHH domains of camelid single chain antibodies have been useful in numerous biotechnology applications due to their simplicity, biophysical properties, and abilities to bind to their cognate antigens with high affinities and specificity. Their interactions with proteins have been well-studied, but considerably less work has been done to characterize their ability to bind haptens. A high-resolution structural study of three nanobodies (T4, T9, and T10) which have been shown to bind triclocarban (TCC, 3-(4-chlorophenyl)-1-(3,4-dichlorophenyl)urea) with near-nanomolar affinity shows that binding occurs in a tunnel largely formed by CDR1 rather than a surface or lateral binding mode seen in other nanobody-hapten interactions. Additional significant interactions are formed with a non-hypervariable loop, sometimes dubbed "CDR4". A comparison of apo and holo forms of T9 and T10 shows that the binding site undergoes little conformational change upon binding of TCC. Structures of three nanobody-TCC complexes demonstrated there was not a standard binding mode. T4 and T9 have a high degree of sequence identity and bind the hapten in a nearly identical manner, while the more divergent T10 binds TCC in a slightly displaced orientation with the urea moiety rotated approximately 180 degrees along the long axis of the molecule. In addition to methotrexate, this is the second report of haptens binding in a tunnel formed by CDR1, suggesting that compounds with similar hydrophobicity and shape could be recognized by nanobodies in analogous fashion. Structure-guided mutations failed to improve binding affinity for T4 and T9 underscoring the high degree of natural optimization.

Structure and specificity of several triclocarban-binding single domain camelid antibody fragments.,Tabares-da Rosa S, Wogulis LA, Wogulis MD, Gonzalez-Sapienza G, Wilson DK J Mol Recognit. 2019 Jan;32(1):e2755. doi: 10.1002/jmr.2755. Epub 2018 Jul 23. PMID:30033524<ref>PMID:30033524</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 5vm6" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Lama glama]]
[[Category: Large Structures]]
[[Category: Gonzalez-Sapienza G]]
[[Category: Tabares-da Rosa S]]
[[Category: Wilson DK]]