View source for 5vta


==Co-Crystal Structure of DPPIV with a Chemibody Inhibitor==
<StructureSection load='5vta' size='340' side='right' caption='[[5vta]], [[Resolution|resolution]] 2.80&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5vta]] is a 12 chain structure with sequence from [http://en.wikipedia.org/wiki/Buffalo_rat Buffalo rat] and [http://en.wikipedia.org/wiki/Lk3_transgenic_mice Lk3 transgenic mice]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5VTA OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5VTA FirstGlance]. <br>
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=9K4:2-{4-[(3R)-3-amino-4-(2,4,5-trifluorophenyl)butanoyl]piperazin-1-yl}-N-(22-oxo-3,6,9,12,15,18-hexaoxa-21-azatricosan-1-yl)acetamide'>9K4</scene>, <scene name='pdbligand=EDO:1,2-ETHANEDIOL'>EDO</scene>, <scene name='pdbligand=NAG:N-ACETYL-D-GLUCOSAMINE'>NAG</scene>, <scene name='pdbligand=PEG:DI(HYDROXYETHYL)ETHER'>PEG</scene>, <scene name='pdbligand=PG4:TETRAETHYLENE+GLYCOL'>PG4</scene></td></tr>
<tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4ffv|4ffv]], [[4ffw|4ffw]]</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">Dpp4, Cd26 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=10116 Buffalo rat])</td></tr>
<tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Dipeptidyl-peptidase_IV Dipeptidyl-peptidase IV], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.14.5 3.4.14.5] </span></td></tr>
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=5vta FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5vta OCA], [http://pdbe.org/5vta PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=5vta RCSB], [http://www.ebi.ac.uk/pdbsum/5vta PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=5vta ProSAT]</span></td></tr>
</table>
== Function ==
[[http://www.uniprot.org/uniprot/DPP4_RAT DPP4_RAT]] Cell surface glycoprotein receptor involved in the costimulatory signal essential for T-cell receptor (TCR)-mediated T-cell activation. Acts as a positive regulator of T-cell coactivation, by binding at least ADA, CAV1, IGF2R, and PTPRC. Its binding to CAV1 and CARD11 induces T-cell proliferation and NF-kappa-B activation in a T-cell receptor/CD3-dependent manner. Its interaction with ADA also regulates lymphocyte-epithelial cell adhesion. In association with FAP is involved in the pericellular proteolysis of the extracellular matrix (ECM), the migration and invasion of endothelial cells into the ECM. May be involved in the promotion of lymphatic endothelial cells adhesion, migration and tube formation. When overexpressed, enhanced cell proliferation, a process inhibited by GPC3. Acts also as a serine exopeptidase with a dipeptidyl peptidase activity that regulates various physiological processes by cleaving peptides in the circulation, including many chemokines, mitogenic growth factors, neuropeptides and peptide hormones (By similarity). Removes N-terminal dipeptides sequentially from polypeptides having unsubstituted N-termini provided that the penultimate residue is proline. 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
Small molecules and antibodies each have advantages and limitations as therapeutics. Here, we present for the first time to our knowledge, the structure-guided design of "chemibodies" as small molecule-antibody hybrids that offer dual recognition of a single target by both a small molecule and an antibody, using DPP-IV enzyme as a proof of concept study. Biochemical characterization demonstrates that the chemibodies present superior DPP-IV inhibition compared to either small molecule or antibody component alone. We validated our design by successfully solving a co-crystal structure of a chemibody in complex with DPP-IV, confirming specific binding of the small molecule portion at the interior catalytic site and the Fab portion at the protein surface. The discovery of chemibodies presents considerable potential for novel therapeutics that harness the power of both small molecule and antibody modalities to achieve superior specificity, potency, and pharmacokinetic properties.

Structure-guided Discovery of Dual-recognition Chemibodies.,Cheng AC, Doherty EM, Johnstone S, DiMauro EF, Dao J, Luthra A, Ye J, Tang J, Nixey T, Min X, Tagari P, Miranda LP, Wang Z Sci Rep. 2018 May 15;8(1):7570. doi: 10.1038/s41598-018-25848-0. PMID:29765112<ref>PMID:29765112</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5vta" style="background-color:#fffaf0;"></div>
== References ==
<references/>
__TOC__
</StructureSection>
[[Category: Buffalo rat]]
[[Category: Dipeptidyl-peptidase IV]]
[[Category: Lk3 transgenic mice]]
[[Category: Cheng, A]]
[[Category: Johnstone, S]]
[[Category: Wang, Z]]
[[Category: Chemibody]]
[[Category: Hydrolase]]