Article: article from journal or magazin.
Death domain assembly mechanism revealed by crystal structure of the oligomeric PIDDosome core complex
Journal Article --- Old month value: Feb 9
Proteins of the death domain (DD) superfamily mediate assembly of oligomeric signaling complexes for the activation of caspases and kinases via unknown mechanisms. Here we report the crystal structure of the PIDD DD and RAIDD DD complex, which forms the core of the caspase-2-activating complex PIDDosome. Although RAIDD DD and PIDD DD are monomers, they assemble into a complex that comprises seven RAIDD DDs and five PIDD DDs. Despite the use of an asymmetric assembly mechanism, all DDs in the complex are in quasi-equivalent environments. The structure provided eight unique asymmetric interfaces, which can be classified into three types. These three types of interactions together cover a majority of the DD surface. Mutagenesis on almost all interfaces leads to disruption of the assembly, resulting in defective caspase-2 activation. The three types of interactions may represent most, if not all, modes of interactions in the DD superfamily for assembling complexes of different stoichiometry.
Amino Acid Sequence CRADD Signaling Adaptor Protein/*chemistry/genetics/*metabolism Caspase 2/metabolism Crystallography, X-Ray Death Domain Receptor Signaling Adaptor Proteins/*chemistry/genetics/*metabolism Models, Molecular Molecular Sequence Data Multiprotein Complexes/*metabolism Mutagenesis, Site-Directed Protein Conformation Protein Structure, Tertiary Recombinant Proteins/chemistry/genetics/metabolism
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