3j9l

Structure of Dark apoptosome from Drosophila melanogaster

spinqualitylabelsall models 3j9l, resolution 4.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3j9l is a 16 chain structure with sequence from Drosophila melanogaster. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: DTP NonStd Res: UNK Related: 3j9k Resources: FirstGlance, OCA, RCSB, PDBsum Warning: this is a large structure, and loading might take a long time or not happen at all. Publication Abstract from PubMed Apoptosis is executed by a cascade of caspase activation. The autocatalytic activation of an initiator caspase, exemplified by caspase-9 in mammals or its ortholog, Dronc, in fruit flies, is facilitated by a multimeric adaptor complex known as the apoptosome. The underlying mechanism by which caspase-9 or Dronc is activated by the apoptosome remains unknown. Here we report the electron cryomicroscopic (cryo-EM) structure of the intact apoptosome from Drosophila melanogaster at 4.0 A resolution. Analysis of the Drosophila apoptosome, which comprises 16 molecules of the Dark protein (Apaf-1 ortholog), reveals molecular determinants that support the assembly of the 2.5-MDa complex. In the absence of dATP or ATP, Dronc zymogen potently induces formation of the Dark apoptosome, within which Dronc is efficiently activated. At 4.1 A resolution, the cryo-EM structure of the Dark apoptosome bound to the caspase recruitment domain (CARD) of Dronc (Dronc-CARD) reveals two stacked rings of Dronc-CARD that are sandwiched between two octameric rings of the Dark protein. The specific interactions between Dronc-CARD and both the CARD and the WD40 repeats of a nearby Dark protomer are indispensable for Dronc activation. These findings reveal important mechanistic insights into the activation of initiator caspase by the apoptosome. Structure of the apoptosome: mechanistic insights into activation of an initiator caspase from Drosophila.,Pang Y, Bai XC, Yan C, Hao Q, Chen Z, Wang JW, Scheres SH, Shi Y Genes Dev. 2015 Feb 1;29(3):277-87. doi: 10.1101/gad.255877.114. PMID:25644603 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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