Journal
CURRENT BIOLOGY
Volume 28, Issue 3, Pages 369-+Publisher
CELL PRESS
DOI: 10.1016/j.cub.2017.12.047
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Funding
- Swedish Research Council [K2012-61X-22097-01-3]
- Swedish Alzheimer Foundation
- Swedish Society of Medicine [SLS-497601]
- Foundation for Gamla Tjanarinnor [2014-00012]
- German Research Foundation [1422/1-1]
- Foundation for Geriatric Diseases at Karolinska Institutet [2014alde42412]
- European Union's Horizon research and innovation programme under the Marie Sklodowska-Curie grant [676144]
- Sweden: Swedish Research Council [529-2014-7499]
- Italy: MIUR (DM 9)
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- Centre for Innovative Medicine
- Jonasson Center at the Royal Institute of Technology, Sweden
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The mitochondrial translocase of the outer membrane (TOM) is a protein complex that is essential for the post-translational import of nuclear-encoded mitochondrial proteins. Among its subunits, TOM70 and TOM20 are only transiently associated with the core complex, suggesting their possible additional roles within the outer mitochondrial membrane (OMM). Here, by using different mammalian cell lines, we demonstrate that TOM70, but not TOM20, clusters in distinct OMM foci, frequently overlapping with sites in which the endoplasmic reticulum (ER) contacts mitochondria. Functionally, TOM70 depletion specifically impairs inositol trisphosphates (IP3)-linked ER to mitochondria Ca2+ transfer. This phenomenon is dependent on the capacity of TOM70 to interact with IP3-receptors and favor their functional recruitment close to mitochondria. Importantly, the reduced constitutive Ca2+ transfer to mitochondria, observed in TOM70-depleted cells, dampens mitochondrial respiration, affects cell bio-energetics, induces autophagy, and inhibits proliferation. Our data reveal a hitherto unexpected role for TOM70 in pro-survival ER-mitochondria communication, reinforcing the view that the ER-mitochondria signaling platform is a key regulator of cell fate.
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