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Publication : Apollon ubiquitinates SMAC and caspase-9, and has an essential cytoprotection function.

First Author  Hao Y Year  2004
Journal  Nat Cell Biol Volume  6
Issue  9 Pages  849-60
PubMed ID  15300255 Mgi Jnum  J:96768
Mgi Id  MGI:3531395 Doi  10.1038/ncb1159
Citation  Hao Y, et al. (2004) Apollon ubiquitinates SMAC and caspase-9, and has an essential cytoprotection function. Nat Cell Biol 6(9):849-60
abstractText  Apollon (also known as BRUCE or BIRC6) is a large protein containing baculoviral-IAP-repeat (BIR) and ubiquitin-conjugating enzyme (UBC) domains at the amino- and carboxy termini, respectively. Apollon inhibits apoptosis, but its molecular and physiological function remains unclear. Here we report that Apollon binds to, ubiquitinates and facilitates proteasomal degradation of SMAC and caspase-9, which both contain IAP-binding motifs. Targeted disruption of Apollon in mice caused embryonic and neonatal lethality. Notably, SMAC induced apoptosis in Apollon-deficient cells, but not in Apollon-expressing cells. Furthermore, the IAP-binding motif of SMAC was required to induce apoptosis in Apollon-deficient cells. These results suggest that Apollon has an essential function in preventing SMAC-induced apoptosis.
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