Reference: Busto JV, et al. (2024) Role of the small protein Mco6 in the mitochondrial sorting and assembly machinery. Cell Rep 43(3): 113805.

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Abstract


The majority of mitochondrial precursor proteins are imported through the Tom40 beta-barrel channel of the translocase of the outer membrane (TOM). The sorting and assembly machinery (SAM) is essential for beta-barrel membrane protein insertion into the outer membrane and thus required for the assembly of the TOM complex. Here, we demonstrate that the alpha-helical outer membrane protein Mco6 co-assembles with the mitochondrial distribution and morphology protein Mdm10 as part of the SAM machinery. MCO6 and MDM10 display a negative genetic interaction, and a mco6-mdm10 yeast double mutant displays reduced levels of the TOM complex. Cells lacking Mco6 affect the levels of Mdm10 and show assembly defects of the TOM complex. Thus, this work uncovers a role of the SAM(Mco6) complex for the biogenesis of the mitochondrial outer membrane.

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Journal Article
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Busto JV, Ganesan I, Mathar H, Steiert C, Schneider EF, Straub SP, Ellenrieder L, Song J, Stiller SB, Lubbert P, ... Show all
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