Interaction between AIF and CHCHD4 regulates respiratory chain biogenesis

Hangen, E. et al. (2015) Interaction between AIF and CHCHD4 regulates respiratory chain biogenesis. Molecular Cell, 58(6), pp. 1001-1014. (doi:10.1016/j.molcel.2015.04.020) (PMID:26004228)

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Abstract

Apoptosis-inducing factor (AIF) is a mitochondrial flavoprotein that, beyond its apoptotic function, is required for the normal expression of major respiratory chain complexes. Here we identified an AIF-interacting protein, CHCHD4, which is the central component of a redox-sensitive mitochondrial intermembrane space import machinery. Depletion or hypomorphic mutation of AIF caused a downregulation of CHCHD4 protein by diminishing its mitochondrial import. CHCHD4 depletion sufficed to induce a respiratory defect that mimicked that observed in AIF-deficient cells. CHCHD4 levels could be restored in AIF-deficient cells by enforcing its AIF-independent mitochondrial localization. This modified CHCHD4 protein reestablished respiratory function in AIF-deficient cells and enabled AIF-deficient embryoid bodies to undergo cavitation, a process of programmed cell death required for embryonic morphogenesis. These findings explain how AIF contributes to the biogenesis of respiratory chain complexes, and they establish an unexpected link between the vital function of AIF and the propensity of cells to undergo apoptosis.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Tokatlidis, Professor Kostas and Chatzi, Ms Afroditi and Nuebel, Dr Esther
Authors: Hangen, E., Féraud, O., Lachkar, S., Mou, H., Doti, N., Fimia, G.M., Lam, N.v., Zhu, C., Godin, I., Muller, K., Chatzi, A., Nuebel, E., Ciccosanti, F., Flamant, S., Bénit, P., Perfettini, J.-L., Sauvat, A., Bennaceur-Griscelli, A., Ser-Le Roux, K., Gonin, P., Tokatlidis, K., Rustin, P., Piacentini, M., Ruvo, M., Blomgren, K., Kroemer, G., and Modjtahedi, N.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Molecular Cell
Publisher:Elsevier Inc.
ISSN:1097-2765
ISSN (Online):1097-4164
Published Online:21 May 2015
Copyright Holders:Copyright © 2015 Elsevier
First Published:First published in Molecular Cell 58(6):1001-1014
Publisher Policy:Reproduced in accordance with the copyright policy of the publisher

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