Journal
FASEB JOURNAL
Volume 33, Issue 2, Pages 1836-1851Publisher
FEDERATION AMER SOC EXP BIOL
DOI: 10.1096/fj.201800756R
Keywords
mitochondria; Lrpprc; oxphos; traslational efficiency; protein phosphorylation
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Funding
- Fundacion La Caixa (Obra Social La Caixa)
- Formacion de Personal Investigador-Ministerio de Economia y Competitividad (FPI-MINECO)
- Fondo Social Europeo
- Ministry of Economy and Enterprise (MINECO) [SAF2016-75916-R]
- Centro de Investigacion Biomedica en Red de Enfermedades Raras- Instituto de Salud Carlos III (CIBERER-ISCIII)
- Fundacion Ramon Areces
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The ATPase inhibitory factor 1 (IF1) is an intrinsically disordered protein that regulates the activity of the mitochondrial ATP synthase. Phosphorylation of S39 in IF1 prevents it from binding to the enzyme and thus abolishes its inhibitory activity. Dysregulation of IF1 is linked to different human diseases, providing a relevant biomarker of cancer progression. However, the tissue content of IF1 relative to the abundance of the ATP synthase is unknown. In this study, we characterized the tissue-specific expression of IF1 in human and mouse tissues and quantitated the content of IF1 and of ATP synthase. We found relevant differences in IF1 expression between human and mouse tissues and found that in high-energy-demanding tissues, the molar content of IF1 exceeds that of the ATP synthase. In these tissues, a fraction of IF1 is bound to the enzyme, and the other fraction is phosphorylated and hence is unable to bind the enzyme. Post-transcriptional control accounts for most of the regulated expression of IF1, especially in mouse heart, where IF1 mRNA translation is repressed by the leucine-rich pentatricopeptide repeat containing protein. Overall, these findings enlighten the cellular biology of IF1 and pave the way to development of additional models that address its role in pathophysiology.Esparza-Molto, P. B., Nuevo-Tapioles, C., Chamorro, M., Najera, L., Torresano, L., Santacatterina, F., Cuezva, J. M. Tissue-specific expression and post-transcriptional regulation of the ATPase inhibitory factor 1 (IF1) in human and mouse tissues.
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