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

作者: Yanyan Hao , Keiko Sekine , Atsushi Kawabata , Hitoshi Nakamura , Toshiyasu Ishioka

DOI: 10.1038/NCB1159

关键词:

摘要: 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- carboxy termini, respectively. inhibits apoptosis, but its molecular physiological function remains unclear. Here we report that binds to, ubiquitinates facilitates proteasomal degradation of SMAC caspase-9, which both contain IAP-binding motifs. Targeted disruption in mice caused embryonic neonatal lethality. Notably, induced apoptosis Apollon-deficient cells, not Apollon-expressing cells. Furthermore, motif was required to induce These results suggest has an essential preventing SMAC-induced apoptosis.

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