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Mol Biol Cell. 2017 Jun 1;28(11):1489-1506. doi: 10.1091/mbc.E17-03-0195. Epub 2017 Apr 12.

Human adenine nucleotide translocases physically and functionally interact with respirasomes.

Author information

1
Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2185.
2
McKusick-Nathans Institute of Genetic Medicine, Departments of Biological Chemistry, Pathology and Oncology, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2185.
3
Department of Internal Medicine, National Taiwan University Hospital and National Taiwan University Cancer Center, Taipei 10051, Taiwan.
4
Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205-2185 sclaypo1@jhmi.edu.

Abstract

Members of the adenine nucleotide translocase (ANT) family exchange ADP for ATP across the mitochondrial inner membrane, an activity that is essential for oxidative phosphorylation (OXPHOS). Mutations in or dysregulation of ANTs is associated with progressive external ophthalmoplegia, cardiomyopathy, nonsyndromic intellectual disability, apoptosis, and the Warburg effect. Binding partners of human ANTs have not been systematically identified. The absence of such information has prevented a detailed molecular understanding of the assorted ANT-associated diseases, including insight into their disparate phenotypic manifestations. To fill this void, in this study, we define the interactomes of two human ANT isoforms. Analogous to its yeast counterpart, human ANTs associate with heterologous partner proteins, including the respiratory supercomplex (RSC) and other solute carriers. The evolutionarily conserved ANT-RSC association is particularly noteworthy because the composition, and thereby organization, of RSCs in yeast and human is different. Surprisingly, absence of the major ANT isoform only modestly impairs OXPHOS in HEK293 cells, indicating that the low levels of other isoforms provide functional redundancy. In contrast, pharmacological inhibition of OXPHOS expression and function inhibits ANT-dependent ADP/ATP exchange. Thus ANTs and the OXPHOS machinery physically interact and functionally cooperate to enhance ANT transport capacity and mitochondrial respiration.

PMID:
28404750
PMCID:
PMC5449148
DOI:
10.1091/mbc.E17-03-0195
[Indexed for MEDLINE]
Free PMC Article

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