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==CRYSTAL STRUCTURE OF THE CASPASE-8/P35 COMPLEX== | |||
<StructureSection load='1i4e' size='340' side='right'caption='[[1i4e]], [[Resolution|resolution]] 3.00Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[1i4e]] is a 2 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=1I4E OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1I4E FirstGlance]. <br> | |||
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 3Å</td></tr> | |||
<tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><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=1i4e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1i4e OCA], [https://pdbe.org/1i4e PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1i4e RCSB], [https://www.ebi.ac.uk/pdbsum/1i4e PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1i4e ProSAT]</span></td></tr> | |||
</table> | |||
== Evolutionary Conservation == | |||
[[Image:Consurf_key_small.gif|200px|right]] | |||
Check<jmol> | |||
<jmolCheckbox> | |||
<scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/i4/1i4e_consurf.spt"</scriptWhenChecked> | |||
<scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview03.spt</scriptWhenUnchecked> | |||
<text>to colour the structure by Evolutionary Conservation</text> | |||
</jmolCheckbox> | |||
</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=1i4e ConSurf]. | |||
<div style="clear:both"></div> | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Apoptosis is a highly regulated process that is crucial for normal development and homeostasis of multicellular organisms. The p35 protein from baculoviruses effectively prevents apoptosis by its broad-spectrum caspase inhibition. Here we report the crystal structure of p35 in complex with human caspase-8 at 3.0 A resolution, and biochemical and mutagenesis studies based on the structural information. The structure reveals that the caspase is inhibited in the active site through a covalent thioester linkage to p35, which we confirmed by gel electrophoresis, hydroxylamine treatment and mass spectrometry experiments. The p35 protein undergoes dramatic conformational changes on cleavage by the caspase. The repositioning of the amino terminus of p35 into the active site of the caspase eliminates solvent accessibility of the catalytic dyad. This may be crucial for preventing hydrolysis of the thioester intermediate, which is supported by the abrogation of inhibitory activity through mutations at the N terminus of p35. The p35 protein also makes conserved contacts with the caspase outside the active-site region, providing the molecular basis for the broad-spectrum inhibitory activity of this protein. We demonstrate a new molecular mechanism of caspase inhibition, as well as protease inhibition in general. | |||
Covalent inhibition revealed by the crystal structure of the caspase-8/p35 complex.,Xu G, Cirilli M, Huang Y, Rich RL, Myszka DG, Wu H Nature. 2001 Mar 22;410(6827):494-7. PMID:11260720<ref>PMID:11260720</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
</div> | |||
<div class="pdbe-citations 1i4e" style="background-color:#fffaf0;"></div> | |||
== | ==See Also== | ||
*[[Caspase 3D structures|Caspase 3D structures]] | |||
[[Category: | == References == | ||
[[Category: | <references/> | ||
[[Category: Cirilli | __TOC__ | ||
[[Category: Huang | </StructureSection> | ||
[[Category: Myszka | [[Category: Autographa californica nucleopolyhedrovirus]] | ||
[[Category: Rich | [[Category: Homo sapiens]] | ||
[[Category: Wu | [[Category: Large Structures]] | ||
[[Category: Xu | [[Category: Cirilli M]] | ||
[[Category: Huang Y]] | |||
[[Category: Myszka DG]] | |||
[[Category: Rich RL]] | |||
[[Category: Wu H]] | |||
[[Category: Xu G]] | |||
Latest revision as of 03:04, 21 November 2024
CRYSTAL STRUCTURE OF THE CASPASE-8/P35 COMPLEXCRYSTAL STRUCTURE OF THE CASPASE-8/P35 COMPLEX
Structural highlights
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 PubMedApoptosis is a highly regulated process that is crucial for normal development and homeostasis of multicellular organisms. The p35 protein from baculoviruses effectively prevents apoptosis by its broad-spectrum caspase inhibition. Here we report the crystal structure of p35 in complex with human caspase-8 at 3.0 A resolution, and biochemical and mutagenesis studies based on the structural information. The structure reveals that the caspase is inhibited in the active site through a covalent thioester linkage to p35, which we confirmed by gel electrophoresis, hydroxylamine treatment and mass spectrometry experiments. The p35 protein undergoes dramatic conformational changes on cleavage by the caspase. The repositioning of the amino terminus of p35 into the active site of the caspase eliminates solvent accessibility of the catalytic dyad. This may be crucial for preventing hydrolysis of the thioester intermediate, which is supported by the abrogation of inhibitory activity through mutations at the N terminus of p35. The p35 protein also makes conserved contacts with the caspase outside the active-site region, providing the molecular basis for the broad-spectrum inhibitory activity of this protein. We demonstrate a new molecular mechanism of caspase inhibition, as well as protease inhibition in general. Covalent inhibition revealed by the crystal structure of the caspase-8/p35 complex.,Xu G, Cirilli M, Huang Y, Rich RL, Myszka DG, Wu H Nature. 2001 Mar 22;410(6827):494-7. PMID:11260720[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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