2k7z

From Proteopedia

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Revision as of 11:00, 18 July 2018

Solution Structure of the Catalytic Domain of Procaspase-8

Structural highlights

2k7z is a 1 chain structure with sequence from Human. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	CASP8, MCH5 (HUMAN)
Activity:	Caspase-8, with EC number 3.4.22.61
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Disease

[CASP8_HUMAN] Defects in CASP8 are the cause of caspase-8 deficiency (CASP8D) [MIM:607271]. CASP8D is a disorder resembling autoimmune lymphoproliferative syndrome (ALPS). It is characterized by lymphadenopathy, splenomegaly, and defective CD95-induced apoptosis of peripheral blood lymphocytes (PBLs). It leads to defects in activation of T-lymphocytes, B-lymphocytes, and natural killer cells leading to immunodeficiency characterized by recurrent sinopulmonary and herpes simplex virus infections and poor responses to immunization.^[1]

Function

[CASP8_HUMAN] Most upstream protease of the activation cascade of caspases responsible for the TNFRSF6/FAS mediated and TNFRSF1A induced cell death. Binding to the adapter molecule FADD recruits it to either receptor. The resulting aggregate called death-inducing signaling complex (DISC) performs CASP8 proteolytic activation. The active dimeric enzyme is then liberated from the DISC and free to activate downstream apoptotic proteases. Proteolytic fragments of the N-terminal propeptide (termed CAP3, CAP5 and CAP6) are likely retained in the DISC. Cleaves and activates CASP3, CASP4, CASP6, CASP7, CASP9 and CASP10. May participate in the GZMB apoptotic pathways. Cleaves ADPRT. Hydrolyzes the small-molecule substrate, Ac-Asp-Glu-Val-Asp-|-AMC. Likely target for the cowpox virus CRMA death inhibitory protein. Isoform 5, isoform 6, isoform 7 and isoform 8 lack the catalytic site and may interfere with the pro-apoptotic activity of the complex.^[2] ^[3]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Caspases are proteases with an active-site cysteine and aspartate specificity in their substrates. They are involved in apoptotic cell death and inflammation, and dysfunction of these enzymes is directly linked to a variety of diseases. Caspase-8 initiates an apoptotic pathway triggered by external stimuli. It was previously characterized in its active inhibitor bound state by crystallography. Here we present the solution structure of the monomeric unprocessed catalytic domain of the caspase-8 zymogen, procaspase-8, showing for the first time the position of the linker and flexibility of the active site forming loops. Biophysical studies of carefully designed mutants allowed disentangling dimerization and processing, and we could demonstrate lack of activity of monomeric uncleaved procaspase-8 and of a processed but dimerization-incompetent mutant. The data provide experimental support in so-far unprecedented detail, and reveal why caspase-8 (and most likely other initiator caspases) needs the dimerization platform during activation.

Structural and biochemical studies on procaspase-8: new insights on initiator caspase activation.,Keller N, Mares J, Zerbe O, Grutter MG Structure. 2009 Mar 11;17(3):438-48. PMID:19278658^[4]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Chun HJ, Zheng L, Ahmad M, Wang J, Speirs CK, Siegel RM, Dale JK, Puck J, Davis J, Hall CG, Skoda-Smith S, Atkinson TP, Straus SE, Lenardo MJ. Pleiotropic defects in lymphocyte activation caused by caspase-8 mutations lead to human immunodeficiency. Nature. 2002 Sep 26;419(6905):395-9. PMID:12353035 doi:10.1038/nature01063
↑ Himeji D, Horiuchi T, Tsukamoto H, Hayashi K, Watanabe T, Harada M. Characterization of caspase-8L: a novel isoform of caspase-8 that behaves as an inhibitor of the caspase cascade. Blood. 2002 Jun 1;99(11):4070-8. PMID:12010809
↑ Muzio M, Salvesen GS, Dixit VM. FLICE induced apoptosis in a cell-free system. Cleavage of caspase zymogens. J Biol Chem. 1997 Jan 31;272(5):2952-6. PMID:9006941
↑ Keller N, Mares J, Zerbe O, Grutter MG. Structural and biochemical studies on procaspase-8: new insights on initiator caspase activation. Structure. 2009 Mar 11;17(3):438-48. PMID:19278658 doi:10.1016/j.str.2008.12.019

1 Structural highlights
2 Disease
3 Function
4 Evolutionary Conservation
5 Publication Abstract from PubMed
6 See Also
7 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/2k7z"

@@ Line 1: / Line 1: @@
 ==Solution Structure of the Catalytic Domain of Procaspase-8==
 <StructureSection load='2k7z' size='340' side='right' caption='[[2k7z]], [[NMR_Ensembles_of_Models | 20 NMR models]]' scene=''>
@@ Line 5: / Line 6: @@
 </td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">CASP8, MCH5 ([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-8 Caspase-8], with EC number [http://www.brenda-enzymes.info/php/result_flat.php4?ecno=3.4.22.61 3.4.22.61] </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=2k7z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k7z OCA], [http://pdbe.org/2k7z PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2k7z RCSB], [http://www.ebi.ac.uk/pdbsum/2k7z PDBsum]</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=2k7z FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2k7z OCA], [http://pdbe.org/2k7z PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=2k7z RCSB], [http://www.ebi.ac.uk/pdbsum/2k7z PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=2k7z ProSAT]</span></td></tr>
 </table>
 == Disease ==
@@ Line 15: / Line 16: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/k7/2k7z_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/k7/2k7z_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>
@@ Line 46: / Line 47: @@
 [[Category: Apoptosis]]
 [[Category: Caspase]]
+[[Category: Cytoplasm]]
 [[Category: Hydrolase]]
 [[Category: Initiator caspase]]

2k7z

From Proteopedia

Revision as of 11:00, 18 July 2018

Solution Structure of the Catalytic Domain of Procaspase-8

Structural highlights

Disease

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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