Journal
NATURE CELL BIOLOGY
Volume 5, Issue 4, Pages 352-357Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/ncb955
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Bax is a pro-apoptotic member of Bcl-2 family proteins and is central to mitochondria-dependent apoptosis(1-3). Bax resides in the cytosol as a quiescent protein and translocates into mitochondria after apoptotic stimuli(4). Ku70 is a 70K subunit of the Ku complex, which has an important role in DNA double-strand break (DSB) repair in the nucleus(5). In another article in this issue, we reported that Ku70 interacts with pro-apoptotic protein Bax in the cytosol and prevents its mitochondrial translocation(6), suggesting that Ku70 suppresses Bax-mediated apoptosis. Here, we describe the development of a new membrane-permeable peptide, Bax-inhibiting peptide (BIP) that inhibits Bax-mediated apoptosis, on the basis of the previous finding that showed an interaction between Ku70 and Bax. BIP is comprised of five amino acids designed from the Bax-binding domain of Ku70, and suppresses the mitochondrial translocation of Bax. BIP inhibited Bax-mediated apoptosis induced by staurosporine, UVC irradiation and anti-cancer drugs in several types of cells. BIP may provide valuable information in the development of therapeutics that control apoptosis-related diseases.
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