The mitochondrial inhibitor IF1 binds to the ATP synthase OSCP subunit and protects cancer cells from apoptosis

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作者：
Chiara Galber
Simone Fabbian
Cristina Gatto
Martina Grandi
Stefania Carissimi
Manuel Jesus Acosta
Gianluca Sgarbi
Natascia Tiso
Francesco Argenton
Giancarlo Solaini
Alessandra Baracca
Massimo Bellanda
Valentina Giorgio
机构：
[1] University of Bologna,Department of Biomedical and Neuromotor Sciences
[2] Consiglio Nazionale delle Ricerche Institute of Neuroscience,Department of Chemical Science
[3] University of Padova,Department of Biology
[4] University of Padova,undefined
[5] Consiglio Nazionale delle Ricerche Institute of Biomolecular Chemistry,undefined
来源：
Cell Death & Disease | / 14卷
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摘要：
The mitochondrial protein IF1 binds to the catalytic domain of the ATP synthase and inhibits ATP hydrolysis in ischemic tissues. Moreover, IF1 is overexpressed in many tumors and has been shown to act as a pro-oncogenic protein, although its mechanism of action is still debated. Here, we show that ATP5IF1 gene disruption in HeLa cells decreases colony formation in soft agar and tumor mass development in xenografts, underlining the role of IF1 in cancer. Notably, the lack of IF1 does not affect proliferation or oligomycin-sensitive mitochondrial respiration, but it sensitizes the cells to the opening of the permeability transition pore (PTP). Immunoprecipitation and proximity ligation analysis show that IF1 binds to the ATP synthase OSCP subunit in HeLa cells under oxidative phosphorylation conditions. The IF1–OSCP interaction is confirmed by NMR spectroscopy analysis of the recombinant soluble proteins. Overall, our results suggest that the IF1-OSCP interaction protects cancer cells from PTP-dependent apoptosis under normoxic conditions.
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