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{{STRUCTURE_3sip|  PDB=3sip  |  SCENE=  }}
==Crystal structure of drICE and dIAP1-BIR1 complex==
===Crystal structure of drICE and dIAP1-BIR1 complex===
<StructureSection load='3sip' size='340' side='right' caption='[[3sip]], [[Resolution|resolution]] 3.50&Aring;' scene=''>
{{ABSTRACT_PUBMED_21811237}}
== Structural highlights ==
<table><tr><td colspan='2'>[[3sip]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SIP OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3SIP FirstGlance]. <br>
</td></tr><tr><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat"><scene name='pdbligand=ZN:ZINC+ION'>ZN</scene><br>
<tr><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[3siq|3siq]]</td></tr>
<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=3sip FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=3sip OCA], [http://www.rcsb.org/pdb/explore.do?structureId=3sip RCSB], [http://www.ebi.ac.uk/pdbsum/3sip PDBsum]</span></td></tr>
<table>
<div style="background-color:#fffaf0;">
== Publication Abstract from PubMed ==
The Drosophila inhibitor of apoptosis protein DIAP1 exists in an auto-inhibited conformation, unable to suppress the effector caspase drICE. Auto-inhibition is disabled by caspase-mediated cleavage of DIAP1 after Asp20. The cleaved DIAP1 binds to mature drICE, inhibits its protease activity, and, presumably, also targets drICE for ubiquitylation. DIAP1-mediated suppression of drICE is effectively antagonized by the pro-apoptotic proteins Reaper, Hid, and Grim (RHG). Despite rigorous effort, the molecular mechanisms behind these observations are enigmatic. Here we report a 2.4 A crystal structure of uncleaved DIAP1-BIR1, which reveals how the amino-terminal sequences recognize a conserved surface groove in BIR1 to achieve auto-inhibition, and a 3.5 A crystal structure of active drICE bound to cleaved DIAP1-BIR1, which provides a structural explanation to DIAP1-mediated inhibition of drICE. These structures and associated biochemical analyses, together with published reports, define the molecular determinants that govern the interplay among DIAP1, drICE and the RHG proteins.


==Function==
Structural mechanisms of DIAP1 auto-inhibition and DIAP1-mediated inhibition of drICE.,Li X, Wang J, Shi Y Nat Commun. 2011 Aug 2;2:408. doi: 10.1038/ncomms1418. PMID:21811237<ref>PMID:21811237</ref>
[[http://www.uniprot.org/uniprot/ICE_DROME ICE_DROME]] Involved in the activation cascade of caspases responsible for apoptosis execution. Acts downstream of rpr. Cleaves baculovirus p35 and lamin DmO in vitro. [[http://www.uniprot.org/uniprot/IAP1_DROME IAP1_DROME]] Anti-apoptotic protein which functions as a caspase regulator, using its E3 ubiquitin-protein ligase activity to smother caspase activity. Binds, ubiquitinates and inactivates initiator caspase Nc, and effector caspases ICE and DCP-1. Acts as a NEDD8-E3 ubiquitin-protein ligase for ICE. Suppresses apoptosis by targeting the apoptosome for ubiquitination and inactivation. Plays an important role in cell motility. Overexpression suppresses rpr and W-dependent cell death in the eye. Interaction of th with Nc is required to suppress Nc-mediated cell death; th-mediated ubiquitination of Nc. Acts as a positive regulator of Wnt signaling.<ref>PMID:8548811</ref> <ref>PMID:17397804</ref> <ref>PMID:18259196</ref> <ref>PMID:21145488</ref> <ref>PMID:22304967</ref> <ref>PMID:14517550</ref>


==About this Structure==
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br>
[[3sip]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Drosophila_melanogaster Drosophila melanogaster]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=3SIP OCA].
</div>
 
== References ==
==See Also==
<references/>
*[[Caspase|Caspase]]
__TOC__
 
</StructureSection>
==Reference==
<ref group="xtra">PMID:021811237</ref><references group="xtra"/><references/>
[[Category: Drosophila melanogaster]]
[[Category: Drosophila melanogaster]]
[[Category: Li, X.]]
[[Category: Li, X.]]
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