The Mitochondrial Inhibitor IF1 Binds to the ATP Synthase OSCP Subunit and Protects Cancer Cells from Apoptosis

Overview

Journal Cell Death Dis

Specialties Cell Biology
General Medicine

Date 2023 Jan 23

PMID 36690622

Authors

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

Affiliations

Soon will be listed here.

Abstract

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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