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| | ==Allosteric peptides that bind to a caspase zymogen and mediate caspase tetramerization== | | ==Allosteric peptides that bind to a caspase zymogen and mediate caspase tetramerization== |
| - | <StructureSection load='4ejf' size='340' side='right' caption='[[4ejf]], [[Resolution|resolution]] 2.65Å' scene=''> | + | <StructureSection load='4ejf' size='340' side='right'caption='[[4ejf]], [[Resolution|resolution]] 2.65Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4ejf]] is a 8 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4EJF OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4EJF FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4ejf]] is a 8 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens] and [https://en.wikipedia.org/wiki/Synthetic_construct Synthetic construct]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4EJF OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4EJF FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> | + | </td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.6465Å</td></tr> |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CASP6, MCH2 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
| + | <tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=PO4:PHOSPHATE+ION'>PO4</scene></td></tr> |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Caspase-6 Caspase-6], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.22.59 3.4.22.59] </span></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=4ejf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ejf OCA], [https://pdbe.org/4ejf PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4ejf RCSB], [https://www.ebi.ac.uk/pdbsum/4ejf PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4ejf ProSAT]</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=4ejf FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4ejf OCA], [http://pdbe.org/4ejf PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4ejf RCSB], [http://www.ebi.ac.uk/pdbsum/4ejf PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4ejf ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CASP6_HUMAN CASP6_HUMAN]] Involved in the activation cascade of caspases responsible for apoptosis execution. Cleaves poly(ADP-ribose) polymerase in vitro, as well as lamins. Overexpression promotes programmed cell death. | + | [https://www.uniprot.org/uniprot/CASP6_HUMAN CASP6_HUMAN] Involved in the activation cascade of caspases responsible for apoptosis execution. Cleaves poly(ADP-ribose) polymerase in vitro, as well as lamins. Overexpression promotes programmed cell death. |
| | <div style="background-color:#fffaf0;"> | | <div style="background-color:#fffaf0;"> |
| | == Publication Abstract from PubMed == | | == Publication Abstract from PubMed == |
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| | ==See Also== | | ==See Also== |
| - | *[[Caspase|Caspase]] | + | *[[Caspase 3D structures|Caspase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Caspase-6]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Human]] | + | [[Category: Large Structures]] |
| - | [[Category: Murray, J M]] | + | [[Category: Synthetic construct]] |
| - | [[Category: C163a]] | + | [[Category: Murray JM]] |
| - | [[Category: Caspase]]
| + | |
| - | [[Category: Hydrolase]]
| + | |
| - | [[Category: Protease]]
| + | |
| - | [[Category: Zymogen]]
| + | |
| Structural highlights
Function
CASP6_HUMAN Involved in the activation cascade of caspases responsible for apoptosis execution. Cleaves poly(ADP-ribose) polymerase in vitro, as well as lamins. Overexpression promotes programmed cell death.
Publication Abstract from PubMed
The caspases are a family of cytosolic proteases with essential roles in inflammation and apoptosis. Drug discovery efforts have focused on developing molecules directed against the active sites of caspases, but this approach has proved challenging and has not yielded any approved therapeutics. Here we describe a new strategy for generating inhibitors of caspase-6, a potential therapeutic target in neurodegenerative disorders, by screening against its zymogen form. Using phage display to discover molecules that bind the zymogen, we report the identification of a peptide that specifically impairs the function of caspase-6 in vitro and in neuronal cells. Remarkably, the peptide binds at a tetramerization interface that is uniquely present in zymogen caspase-6, rather than binding into the active site, and acts via a new allosteric mechanism that promotes caspase tetramerization. Our data illustrate that screening against the zymogen holds promise as an approach for targeting caspases in drug discovery.
Allosteric peptides bind a caspase zymogen and mediate caspase tetramerization.,Stanger K, Steffek M, Zhou L, Pozniak CD, Quan C, Franke Y, Tom J, Tam C, Elliott JM, Lewcock JW, Zhang Y, Murray J, Hannoush RN Nat Chem Biol. 2012 Jun 10. doi: 10.1038/nchembio.967. PMID:22683611[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Stanger K, Steffek M, Zhou L, Pozniak CD, Quan C, Franke Y, Tom J, Tam C, Elliott JM, Lewcock JW, Zhang Y, Murray J, Hannoush RN. Allosteric peptides bind a caspase zymogen and mediate caspase tetramerization. Nat Chem Biol. 2012 Jun 10. doi: 10.1038/nchembio.967. PMID:22683611 doi:10.1038/nchembio.967
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