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<StructureSection load='2fun' size='340' side='right'caption='[[2fun]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
<StructureSection load='2fun' size='340' side='right'caption='[[2fun]], [[Resolution|resolution]] 3.00&Aring;' scene=''>
== Structural highlights ==
== Structural highlights ==
<table><tr><td colspan='2'>[[2fun]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Acmnpv Acmnpv] and [https://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FUN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FUN FirstGlance]. <br>
<table><tr><td colspan='2'>[[2fun]] is a 4 chain structure with sequence from [https://en.wikipedia.org/wiki/Autographa_californica_nucleopolyhedrovirus Autographa californica nucleopolyhedrovirus] and [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2FUN OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=2FUN FirstGlance]. <br>
</td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat"><div style='overflow: auto; max-height: 3em;'>[[1i4e|1i4e]]</div></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]] 3&#8491;</td></tr>
<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">P35 ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=46015 AcMNPV])</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=2fun FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fun OCA], [https://pdbe.org/2fun PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fun RCSB], [https://www.ebi.ac.uk/pdbsum/2fun PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fun ProSAT]</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=2fun FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=2fun OCA], [https://pdbe.org/2fun PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=2fun RCSB], [https://www.ebi.ac.uk/pdbsum/2fun PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=2fun ProSAT]</span></td></tr>
</table>
</table>
== Disease ==
[[https://www.uniprot.org/uniprot/CASP8_HUMAN CASP8_HUMAN]] Defects in CASP8 are the cause of caspase-8 deficiency (CASP8D) [MIM:[https://omim.org/entry/607271 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.<ref>PMID:12353035</ref> 
== Function ==
== Function ==
[[https://www.uniprot.org/uniprot/VP35_NPVAC VP35_NPVAC]] Blocks the insect or worm host cells apoptotic response initiated by the viral infection. Confers protection from cell death in mammalian cells. Acts by blocking the activity of members of the caspase family of proteases. Required for late and very late gene expression. [[https://www.uniprot.org/uniprot/CASP8_HUMAN 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.<ref>PMID:12010809</ref> <ref>PMID:9006941</ref>
[https://www.uniprot.org/uniprot/P35_NPVAC P35_NPVAC] Functions as an inhibitor of the host RNA interference antiviral response. Inhibits the insect host cell apoptotic response initiated by the viral infection. Blocks as well the activity of members of the caspase family of proteases. Required for late and very late gene expression.<ref>PMID:16081248</ref> <ref>PMID:1962198</ref> <ref>PMID:26018163</ref>  
== Evolutionary Conservation ==
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
[[Image:Consurf_key_small.gif|200px|right]]
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__TOC__
__TOC__
</StructureSection>
</StructureSection>
[[Category: Acmnpv]]
[[Category: Autographa californica nucleopolyhedrovirus]]
[[Category: Human]]
[[Category: Homo sapiens]]
[[Category: Large Structures]]
[[Category: Large Structures]]
[[Category: Eliezer, D]]
[[Category: Eliezer D]]
[[Category: Lu, M]]
[[Category: Lu M]]
[[Category: Min, T]]
[[Category: Min T]]
[[Category: Wu, H]]
[[Category: Wu H]]
[[Category: Apoptosis-hydrolase complex]]
[[Category: Apoptosis/hydrolase]]

Latest revision as of 12:32, 30 August 2023

alternative p35-caspase-8 complexalternative p35-caspase-8 complex

Structural highlights

2fun is a 4 chain structure with sequence from Autographa californica nucleopolyhedrovirus and Homo sapiens. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:X-ray diffraction, Resolution 3Å
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

P35_NPVAC Functions as an inhibitor of the host RNA interference antiviral response. Inhibits the insect host cell apoptotic response initiated by the viral infection. Blocks as well the activity of members of the caspase family of proteases. Required for late and very late gene expression.[1] [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

Wide-spectrum caspase inhibition by the baculoviral p35 protein was previously shown to be a consequence of covalent inhibition in which a thioester bond is stably formed between the cleavage residue Asp87 of p35 and the active site Cys360' of caspase-8. Here we show that the N-terminal fragment of cleaved p35 (p35-N) is a circular peptide when dissociated from the caspase. Biochemical and crystallographic data suggest that p35-N circularization results from the trapping of a native chemical ligation intermediate in the p35/caspase complex, in which the N-terminal Cys2 of p35 attacks the Asp87-Cys360' thioester to form an equilibrium between Asp87-Cys2 and Asp87-Cys360'. This provides a crucial covalent interaction for keeping the N terminus of p35 bound in the caspase active site, which explains the absolute requirement of Cys2 for caspase inhibition. Participation of native chemical ligation in caspase inhibition by p35 illustrates an unusual mechanism of protease inhibition.

Native chemical ligation in covalent caspase inhibition by p35.,Lu M, Min T, Eliezer D, Wu H Chem Biol. 2006 Feb;13(2):117-22. PMID:16492559[4]

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

See Also

References

  1. ↑ da Silveira EB, Cordeiro BA, Ribeiro BM, Báo SN. In vivo apoptosis induction and reduction of infectivity by an Autographa californica multiple nucleopolyhedrovirus p35(-) recombinant in hemocytes from the velvet bean caterpillar Anticarsia gemmatalis (Hübner) (Lepidoptera: Noctuidae). Res Microbiol. 2005 Dec;156(10):1014-25. PMID:16081248 doi:10.1016/j.resmic.2005.06.001
  2. ↑ Clem RJ, Fechheimer M, Miller LK. Prevention of apoptosis by a baculovirus gene during infection of insect cells. Science. 1991 Nov 29;254(5036):1388-90. PMID:1962198 doi:10.1126/science.1962198
  3. ↑ Mehrabadi M, Hussain M, Matindoost L, Asgari S. The Baculovirus Antiapoptotic p35 Protein Functions as an Inhibitor of the Host RNA Interference Antiviral Response. J Virol. 2015 Aug;89(16):8182-92. PMID:26018163 doi:10.1128/JVI.00802-15
  4. ↑ Lu M, Min T, Eliezer D, Wu H. Native chemical ligation in covalent caspase inhibition by p35. Chem Biol. 2006 Feb;13(2):117-22. PMID:16492559 doi:10.1016/j.chembiol.2005.12.007

2fun, resolution 3.00Å

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