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| | ==Human procaspase-7/caspase-7 heterodimer bound to Ac-DEVD-CMK== | | ==Human procaspase-7/caspase-7 heterodimer bound to Ac-DEVD-CMK== |
| - | <StructureSection load='4jr2' size='340' side='right' caption='[[4jr2]], [[Resolution|resolution]] 1.65Å' scene=''> | + | <StructureSection load='4jr2' size='340' side='right'caption='[[4jr2]], [[Resolution|resolution]] 1.65Å' scene=''> |
| | == Structural highlights == | | == Structural highlights == |
| - | <table><tr><td colspan='2'>[[4jr2]] is a 4 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=4JR2 OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4JR2 FirstGlance]. <br> | + | <table><tr><td colspan='2'>[[4jr2]] is a 4 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=4JR2 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4JR2 FirstGlance]. <br> |
| - | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr> | + | </td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=0QE:CHLOROMETHANE'>0QE</scene>, <scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</scene>, <scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene></td></tr> |
| - | <tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=0QE:CHLOROMETHANE'>0QE</scene>, <scene name='pdbligand=ACE:ACETYL+GROUP'>ACE</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=4jr2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4jr2 OCA], [https://pdbe.org/4jr2 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4jr2 RCSB], [https://www.ebi.ac.uk/pdbsum/4jr2 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4jr2 ProSAT]</span></td></tr> |
| - | <tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4jqy|4jqy]], [[4jqz|4jqz]], [[4jr0|4jr0]], [[4jr1|4jr1]]</td></tr>
| + | |
| - | <tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CASP7, MCH3 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
| + | |
| - | <tr id='activity'><td class="sblockLbl"><b>Activity:</b></td><td class="sblockDat"><span class='plainlinks'>[http://en.wikipedia.org/wiki/Caspase-7 Caspase-7], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.22.60 3.4.22.60] </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=4jr2 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4jr2 OCA], [http://pdbe.org/4jr2 PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4jr2 RCSB], [http://www.ebi.ac.uk/pdbsum/4jr2 PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4jr2 ProSAT]</span></td></tr> | + | |
| | </table> | | </table> |
| | == Function == | | == Function == |
| - | [[http://www.uniprot.org/uniprot/CASP7_HUMAN CASP7_HUMAN]] Involved in the activation cascade of caspases responsible for apoptosis execution. Cleaves and activates sterol regulatory element binding proteins (SREBPs). Proteolytically cleaves poly(ADP-ribose) polymerase (PARP) at a '216-Asp-|-Gly-217' bond. Overexpression promotes programmed cell death. | + | [https://www.uniprot.org/uniprot/CASP7_HUMAN CASP7_HUMAN] Involved in the activation cascade of caspases responsible for apoptosis execution. Cleaves and activates sterol regulatory element binding proteins (SREBPs). Proteolytically cleaves poly(ADP-ribose) polymerase (PARP) at a '216-Asp-|-Gly-217' bond. 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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| | </div> | | </div> |
| | <div class="pdbe-citations 4jr2" style="background-color:#fffaf0;"></div> | | <div class="pdbe-citations 4jr2" style="background-color:#fffaf0;"></div> |
| | + | |
| | + | ==See Also== |
| | + | *[[Caspase 3D structures|Caspase 3D structures]] |
| | == References == | | == References == |
| | <references/> | | <references/> |
| | __TOC__ | | __TOC__ |
| | </StructureSection> | | </StructureSection> |
| - | [[Category: Caspase-7]] | + | [[Category: Homo sapiens]] |
| - | [[Category: Human]] | + | [[Category: Large Structures]] |
| - | [[Category: Thomsen, N D]] | + | [[Category: Thomsen ND]] |
| - | [[Category: Wells, J A]] | + | [[Category: Wells JA]] |
| - | [[Category: Activity based probe]]
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| - | [[Category: Apoptosis]]
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| - | [[Category: Caspase]]
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| - | [[Category: Hydrolase-hydrolase inhibitor complex]]
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| - | [[Category: Irreversible inhibitor]]
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| - | [[Category: Proenzyme]]
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| - | [[Category: Protease]]
| + | |
| - | [[Category: Protein-peptide complex]]
| + | |
| Structural highlights
Function
CASP7_HUMAN Involved in the activation cascade of caspases responsible for apoptosis execution. Cleaves and activates sterol regulatory element binding proteins (SREBPs). Proteolytically cleaves poly(ADP-ribose) polymerase (PARP) at a '216-Asp-|-Gly-217' bond. Overexpression promotes programmed cell death.
Publication Abstract from PubMed
Procaspase-3 (P3) and procaspase-7 (P7) are activated through proteolytic maturation to form caspase-3 (C3) and caspase-7 (C7), respectively, which serve overlapping but nonredundant roles as the executioners of apoptosis in humans. However, it is unclear if differences in P3 and P7 maturation mechanisms underlie their unique biological functions, as the structure of P3 remains unknown. Here, we report structures of P3 in a catalytically inactive conformation, structures of P3 and P7 bound to covalent peptide inhibitors that reveal the active conformation of the zymogens, and the structure of a partially matured C7:P7 heterodimer. Along with a biochemical analysis, we show that P3 is catalytically inactive and matures through a symmetric all-or-nothing process. In contrast, P7 contains latent catalytic activity and matures through an asymmetric and tiered mechanism, suggesting a lower threshold for activation. Finally, we use our structures to design a selection strategy for conformation specific antibody fragments that stimulate procaspase activity, showing that executioner procaspase conformational equilibrium can be rationally modulated. Our studies provide a structural framework that may help to explain the unique roles of these important proapoptotic enzymes, and suggest general strategies for the discovery of proenzyme activators.
Structural snapshots reveal distinct mechanisms of procaspase-3 and -7 activation.,Thomsen ND, Koerber JT, Wells JA Proc Natl Acad Sci U S A. 2013 May 21;110(21):8477-82. doi:, 10.1073/pnas.1306759110. Epub 2013 May 6. PMID:23650375[1]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
See Also
References
- ↑ Thomsen ND, Koerber JT, Wells JA. Structural snapshots reveal distinct mechanisms of procaspase-3 and -7 activation. Proc Natl Acad Sci U S A. 2013 May 21;110(21):8477-82. doi:, 10.1073/pnas.1306759110. Epub 2013 May 6. PMID:23650375 doi:10.1073/pnas.1306759110
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