View source for 5m6l


==Small Molecule inhibitors of IAP==
<StructureSection load='5m6l' size='340' side='right'caption='[[5m6l]], [[Resolution|resolution]] 2.61&Aring;' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[5m6l]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=5M6L OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=5M6L 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]] 2.61&#8491;</td></tr>
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=7H9:1-[6-[(4-FLUOROPHENYL)METHYL]-3,3-DIMETHYL-2~{H}-PYRROLO[3,2-B]PYRIDIN-1-YL]-2-[(2~{R},5~{R})-5-METHYL-2-[[(3~{R})-3-METHYLMORPHOLIN-4-YL]METHYL]PIPERAZIN-4-IUM-1-YL]ETHANONE'>7H9</scene>, <scene name='pdbligand=NA:SODIUM+ION'>NA</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</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=5m6l FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=5m6l OCA], [https://pdbe.org/5m6l PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=5m6l RCSB], [https://www.ebi.ac.uk/pdbsum/5m6l PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=5m6l ProSAT]</span></td></tr>
</table>
== Disease ==
[https://www.uniprot.org/uniprot/XIAP_HUMAN XIAP_HUMAN] Defects in XIAP are the cause of lymphoproliferative syndrome X-linked type 2 (XLP2) [MIM:[https://omim.org/entry/300635 300635]. XLP is a rare immunodeficiency characterized by extreme susceptibility to infection with Epstein-Barr virus (EBV). Symptoms include severe or fatal mononucleosis, acquired hypogammaglobulinemia, pancytopenia and malignant lymphoma.<ref>PMID:17080092</ref> 
== Function ==
[https://www.uniprot.org/uniprot/XIAP_HUMAN XIAP_HUMAN] Multi-functional protein which regulates not only caspases and apoptosis, but also modulates inflammatory signaling and immunity, copper homeostasis, mitogenic kinase signaling, cell proliferation, as well as cell invasion and metastasis. Acts as a direct caspase inhibitor. Directly bind to the active site pocket of CASP3 and CASP7 and obstructs substrate entry. Inactivates CASP9 by keeping it in a monomeric, inactive state. Acts as an E3 ubiquitin-protein ligase regulating NF-kappa-B signaling and the target proteins for its E3 ubiquitin-protein ligase activity include: RIPK1, CASP3, CASP7, CASP8, CASP9, MAP3K2/MEKK2, DIABLO/SMAC, AIFM1, CCS and BIRC5/survivin. Ubiquitinion of CCS leads to enhancement of its chaperone activity toward its physiologic target, SOD1, rather than proteasomal degradation. Ubiquitinion of MAP3K2/MEKK2 and AIFM1 does not lead to proteasomal degradation. Plays a role in copper homeostasis by ubiquitinationg COMMD1 and promoting its proteasomal degradation. Can also function as E3 ubiquitin-protein ligase of the NEDD8 conjugation pathway, targeting effector caspases for neddylation and inactivation. Regulates the BMP signaling pathway and the SMAD and MAP3K7/TAK1 dependent pathways leading to NF-kappa-B and JNK activation. Acts as an important regulator of innate immune signaling via regulation of Nodlike receptors (NLRs). Protects cells from spontaneous formation of the ripoptosome, a large multi-protein complex that has the capability to kill cancer cells in a caspase-dependent and caspase-independent manner. Suppresses ripoptosome formation by ubiquitinating RIPK1 and CASP8. Acts as a positive regulator of Wnt signaling and ubiquitinates TLE1, TLE2, TLE3, TLE4 and AES. Ubiquitination of TLE3 results in inhibition of its interaction with TCF7L2/TCF4 thereby allowing efficient recruitment and binding of the transcriptional coactivator beta-catenin to TCF7L2/TCF4 that is required to initiate a Wnt-specific transcriptional program.<ref>PMID:9230442</ref> <ref>PMID:11447297</ref> <ref>PMID:12121969</ref> <ref>PMID:14685266</ref> <ref>PMID:14645242</ref> <ref>PMID:17967870</ref> <ref>PMID:19473982</ref> <ref>PMID:21145488</ref> <ref>PMID:20154138</ref> <ref>PMID:22103349</ref> <ref>PMID:22304967</ref> <ref>PMID:17560374</ref> 
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
XIAP and cIAP1 are members of the inhibitor of apoptosis protein (IAP) family and are key regulators of anti-apoptotic and pro-survival signaling pathways. Overexpression of IAPs occurs in various cancers and has been associated with tumor progression and resistance to treatment. Structure-based drug design (SBDD) guided by structural information from X-ray crystallography, computational studies and NMR solution conformational analysis was successfully applied to a fragment-derived lead resulting in AT-IAP, a potent, orally bioavailable, dual antagonist of XIAP and cIAP1 and a structurally novel chemical probe for IAP biology.

Discovery of a Potent Non-peptidomimetic, Small-Molecule Antagonist of Cellular Inhibitor of Apoptosis Protein 1 (cIAP1) and X-linked Inhibitor of Apoptosis Protein (XIAP).,Tamanini E, Buck IM, Chessari G, Chiarparin E, Day JEH, Frederickson M, Griffiths-Jones CM, Hearn K, Heightman TD, Iqbal A, Johnson CN, Lewis EJ, Martins V, Peakman T, Reader M, Rich SJ, Ward GA, Williams PA, Wilsher NE J Med Chem. 2017 May 11. doi: 10.1021/acs.jmedchem.6b01877. PMID:28492317<ref>PMID:28492317</ref>

From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
</div>
<div class="pdbe-citations 5m6l" style="background-color:#fffaf0;"></div>

==See Also==
*[[Ubiquitin protein ligase 3D structures|Ubiquitin protein ligase 3D structures]]
== References ==
<references/>
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Williams PA]]