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==Crystal Structure of the Humanized MUC16 Specific Antibody huAR9.6==
<StructureSection load='8gkl' size='340' side='right'caption='[[8gkl]], [[Resolution|resolution]] 2.60&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[8gkl]] is a 3 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8GKL OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8GKL 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='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=8gkl FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8gkl OCA], [https://pdbe.org/8gkl PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8gkl RCSB], [https://www.ebi.ac.uk/pdbsum/8gkl PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8gkl ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/MUC16_HUMAN MUC16_HUMAN] Thought to provide a protective, lubricating barrier against particles and infectious agents at mucosal surfaces.
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Mucin-16 (MUC16) is a target for antibody-mediated immunotherapy in pancreatic ductal adenocarcinoma (PDAC) among other malignancies. The MUC16-specific monoclonal antibody AR9.6 has shown promise for PDAC immunotherapy and imaging. Here, we report the structural and biological characterization of the humanized AR9.6 antibody (huAR9.6). The structure of huAR9.6 was determined in complex with a MUC16 SEA (Sea urchin sperm, Enterokinase, Agrin) domain. Binding of huAR9.6 to recombinant, shed, and cell-surface MUC16 was characterized, and anti-PDAC activity was evaluated in vitro and in vivo. HuAR9.6 bound a discontinuous, SEA domain epitope with an overall affinity of 88 nmol/L. Binding affinity depended on the specific SEA domain(s) present, and glycosylation modestly enhanced affinity driven by favorable entropy and enthalpy and via distinct transition state thermodynamic pathways. Treatment with huAR9.6 reduced the in vitro growth, migration, invasion, and clonogenicity of MUC16-positive PDAC cells and patient-derived organoids (PDO). HuAR9.6 blocked MUC16-mediated ErbB and AKT activation in PDAC cells, PDOs, and patient-derived xenografts and induced antibody-dependent cellular cytotoxicity and complement-dependent cytotoxicity. More importantly, huAR9.6 treatment caused substantial PDAC regression in subcutaneous and orthotopic tumor models. The mechanism of action of huAR9.6 may depend on dense avid binding to homologous SEA domains on MUC16. The results of this study validate the translational therapeutic potential of huAR9.6 against MUC16-positive PDACs.

Structural Basis for Multivalent MUC16 Recognition and Robust Anti-Pancreatic Cancer Activity of Humanized Antibody AR9.6.,Aguilar EN, Sagar S, Murray BR, Rajesh C, Lei EK, Michaud SA, Goodlett DR, Caffrey TC, Grandgenett PM, Swanson B, Brooks TM, Black AR, van Faassen H, Hussack G, Henry KA, Hollingsworth MA, Brooks CL, Radhakrishnan P Mol Cancer Ther. 2024 Jun 4;23(6):836-853. doi: 10.1158/1535-7163.MCT-23-0868. PMID:38394685<ref>PMID:38394685</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
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== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Mus musculus]]
[[Category: Aguilar EN]]
[[Category: Brooks CL]]