ArticleJournal of cell science2025
The Mia40 substrate Mix17 exposes its N-terminus to the cytosolic side of the mitochondrial outer membrane.
Article in Journal of cell science, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Mitochondrial architecture and the contacts between the mitochondrial outer and the inner membranes depend on the mitochondrial contact site and cristae-organizing system (MICOS) that is highly conserved from yeast to human. Variants in the mammalian MICOS subunit Mic14 (also known as CHCHD10) have been linked to amyotrophic lateral sclerosis and frontotemporal dementia, indicating the importance of this protein. Mic14 has a yeast ortholog, Mix17, a protein of unknown function, which has not been shown to interact with MICOS so far. As a first step to elucidate the function of Mix17 and its orthologs, we analyzed its interactions, biogenesis and mitochondrial sublocation. We report that Mix17 is not a stable MICOS subunit in yeast. Our data suggest that Mix17 is the first Mia40 substrate in the mitochondrial outer membrane. Unlike all other Mia40 substrates, Mix17 spans the mitochondrial outer membrane and exposes its N-terminus to the cytosol. The insertion of Mix17 into the mitochondrial outer membrane is likely to be mediated by its interaction with Tom40, the pore of the TOM complex. Moreover, we show that the exposure of Mix17 to the cytosolic side of the mitochondrial membrane depends on its N-terminus.
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