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1oxn

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[[Image:1oxn.jpg|left|200px]]
 
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{{Structure
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==Structure and Function Analysis of Peptide Antagonists of Melanoma Inhibitor of Apoptosis (ML-IAP)==
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|PDB= 1oxn |SIZE=350|CAPTION= <scene name='initialview01'>1oxn</scene>, resolution 2.20&Aring;
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<StructureSection load='1oxn' size='340' side='right'caption='[[1oxn]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
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|SITE=
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== Structural highlights ==
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|LIGAND= <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene> and <scene name='pdbligand=P33:3,6,9,12,15,18-HEXAOXAICOSANE-1,20-DIOL'>P33</scene>
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<table><tr><td colspan='2'>[[1oxn]] is a 6 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=1OXN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1OXN FirstGlance]. <br>
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|ACTIVITY=
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</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.2&#8491;</td></tr>
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|GENE= BIRC7 OR KIAP OR MLIAP OR LIVIN ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 Homo sapiens])
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<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=P33:3,6,9,12,15,18-HEXAOXAICOSANE-1,20-DIOL'>P33</scene>, <scene name='pdbligand=ZN:ZINC+ION'>ZN</scene></td></tr>
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}}
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<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=1oxn FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1oxn OCA], [https://pdbe.org/1oxn PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1oxn RCSB], [https://www.ebi.ac.uk/pdbsum/1oxn PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1oxn ProSAT]</span></td></tr>
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</table>
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'''Structure and Function Analysis of Peptide Antagonists of Melanoma Inhibitor of Apoptosis (ML-IAP)'''
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== Function ==
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[https://www.uniprot.org/uniprot/BIRC7_HUMAN BIRC7_HUMAN] Apoptotic regulator capable of exerting proapoptotic and anti-apoptotic activities and plays crucial roles in apoptosis, cell proliferation, and cell cycle control. Its anti-apoptotic activity is mediated through the inhibition of CASP3, CASP7 and CASP9, as well as by its E3 ubiquitin-protein ligase activity. As it is a weak caspase inhibitor, its anti-apoptotic activity is thought to be due to its ability to ubiquitinate DIABLO/SMAC targeting it for degradation thereby promoting cell survival. May contribute to caspase inhibition, by blocking the ability of DIABLO/SMAC to disrupt XIAP/BIRC4-caspase interactions. Protects against apoptosis induced by TNF or by chemical agents such as adriamycin, etoposide or staurosporine. Suppression of apoptosis is mediated by activation of MAPK8/JNK1, and possibly also of MAPK9/JNK2. This activation depends on TAB1 and NR2C2/TAK1. In vitro, inhibits CASP3 and proteolytic activation of pro-CASP9. Isoform 1 blocks staurosporine-induced apoptosis. Isoform 2 blocks etoposide-induced apoptosis. Isoform 2 protects against natural killer (NK) cell killing whereas isoform 1 augments killing.<ref>PMID:11084335</ref> <ref>PMID:16729033</ref> <ref>PMID:17294084</ref> <ref>PMID:18034418</ref>
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== Evolutionary Conservation ==
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==Overview==
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[[Image:Consurf_key_small.gif|200px|right]]
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Melanoma inhibitor of apoptosis (ML-IAP) is a potent anti-apoptotic protein that is upregulated in a number of melanoma cell lines but not expressed in most normal adult tissues. Overexpression of IAP proteins, such as ML-IAP or the ubiquitously expressed X-chromosome-linked IAP (XIAP), in human cancers has been shown to suppress apoptosis induced by a variety of stimuli. Peptides based on the processed N-terminus of Smac/DIABLO can negate the ability of overexpressed ML-IAP or XIAP to suppress drug-induced apoptosis. Such peptides have been demonstrated to bind to the single baculovirus IAP repeat (BIR) of ML-IAP and the third BIR of XIAP with similar high affinities (approximately 0.5 microM). Herein, we use phage-display of naive peptide libraries and synthetic peptides to investigate the peptide-binding properties of ML-IAP-BIR and XIAP-BIR3. X-ray crystal structures of ML-IAP-BIR in complex with Smac- and phage-derived peptides, together with peptide structure-activity-relationship data, indicate that the peptides can be modified to provide increased binding affinity and selectivity for ML-IAP-BIR relative to XIAP-BIR3. For instance, substitution of Pro3' in the Smac-based peptide (AVPIAQKSE) with (2S,3S)-3-methylpyrrolidine-2-carboxylic acid [(3S)-methyl-proline] results in a peptide with 7-fold greater affinity for ML-IAP-BIR and about 100-fold specificity for ML-IAP-BIR relative to XIAP-BIR3.
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Check<jmol>
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<jmolCheckbox>
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==About this Structure==
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<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/ox/1oxn_consurf.spt"</scriptWhenChecked>
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1OXN is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1OXN OCA].
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<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
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<text>to colour the structure by Evolutionary Conservation</text>
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==Reference==
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</jmolCheckbox>
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Structure and function analysis of peptide antagonists of melanoma inhibitor of apoptosis (ML-IAP)., Franklin MC, Kadkhodayan S, Ackerly H, Alexandru D, Distefano MD, Elliott LO, Flygare JA, Mausisa G, Okawa DC, Ong D, Vucic D, Deshayes K, Fairbrother WJ, Biochemistry. 2003 Jul 15;42(27):8223-31. PMID:[http://www.ncbi.nlm.nih.gov/pubmed/12846571 12846571]
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</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1oxn ConSurf].
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<div style="clear:both"></div>
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== References ==
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<references/>
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__TOC__
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</StructureSection>
[[Category: Homo sapiens]]
[[Category: Homo sapiens]]
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[[Category: Single protein]]
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[[Category: Large Structures]]
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[[Category: Ackerly, H.]]
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[[Category: Ackerly H]]
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[[Category: Alexandru, D.]]
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[[Category: Alexandru D]]
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[[Category: Deshayes, K.]]
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[[Category: Deshayes K]]
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[[Category: Distefano, M D.]]
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[[Category: Distefano MD]]
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[[Category: Elliott, L O.]]
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[[Category: Elliott LO]]
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[[Category: Fairbrother, W J.]]
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[[Category: Fairbrother WJ]]
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[[Category: Flygare, J A.]]
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[[Category: Flygare JA]]
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[[Category: Franklin, M C.]]
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[[Category: Franklin MC]]
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[[Category: Kadkhodayan, S.]]
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[[Category: Kadkhodayan S]]
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[[Category: Vucic, D.]]
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[[Category: Vucic D]]
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[[Category: P33]]
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[[Category: ZN]]
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[[Category: apoptosis inhibition]]
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[[Category: peptide complex]]
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[[Category: zinc binding]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Mar 20 13:17:02 2008''
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Current revision

Structure and Function Analysis of Peptide Antagonists of Melanoma Inhibitor of Apoptosis (ML-IAP)

PDB ID 1oxn

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