RAIDD is a new 'death' adaptor molecule

Nature
H Duan, V M Dixit

Abstract

The effector arm of the cell-death pathway is composed of cysteine proteases belonging to the ICE/CED-3 family. In metazoan cells these exist as inactive polypeptide precursors (zymogens), each composed of a prodomain, which is cleaved to activate the protease, and a large and small catalytic subunit. The coupling of these 'death' proteases to signalling pathways is probably mediated by adaptor molecules that contain protein-protein interaction motifs such as the death domain. Here we describe such an adaptor molecule, RAIDD, which has an unusual bipartite architecture comprising a carboxy-terminal death domain that binds to the homologous domain in RIP, a serine/threonine kinase component of the death pathway. The amino-terminal domain is surprisingly homologous with the sequence of the prodomain of two ICE/CED-3 family members, human ICH-1 (ref. 5) and Caenorhabditis elegans CED-3 (ref. 6). This similar region mediates the binding of RAIDD to ICH-1 and CED-3, serving as a direct link to the death proteases, indicating that the prodomain may, through homophilic interactions, determine the specificity of binding of ICE/CED-3 zymogens to regulatory adaptor molecules. Finally, alternations in the sequence of the N-terminal domain...Continue Reading

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