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Regulation of Drosophila IAP1 degradation and apoptosis by reaper and ubcD1
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Regulation of Drosophila IAP1 degradation and apoptosis by reaper and ubcD1
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Journal Article
Regulation of Drosophila IAP1 degradation and apoptosis by reaper and ubcD1
2002
Overview
Cell death in higher organisms is negatively regulated by Inhibitor of Apoptosis Proteins (IAPs), which contain a ubiquitin ligase motif, but how ubiquitin-mediated protein degradation is regulated during apoptosis is poorly understood. Here, we report that
Drosophila melanogaster
IAP1 (DIAP1) auto-ubiquitination and degradation is actively regulated by Reaper (Rpr) and UBCD1. We show that Rpr, but not Hid (head involution defective), promotes significant DIAP1 degradation. Rpr-mediated DIAP1 degradation requires an intact DIAP1 RING domain. Among the mutations affecting ubiquitination, we found
ubcD1
, which suppresses
rpr
-induced apoptosis. UBCD1 and Rpr specifically bind to DIAP1 and stimulate DIAP1 auto-ubiquitination
in vitro
. Our results identify a novel function of Rpr in stimulating DIAP1 auto-ubiquitination through UBCD1, thereby promoting its degradation.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ Animals
/ Biomedical and Life Sciences
/ Drosophila Proteins - chemistry
/ Drosophila Proteins - genetics
/ Drosophila Proteins - metabolism
/ Gene Expression Regulation, Developmental
/ Inhibitor of Apoptosis Proteins
/ Mutation
/ Neurons, Afferent - cytology
/ Protein Binding - physiology
/ RNA Processing, Post-Transcriptional - physiology
