PERM1 interacts with the MICOS-MIB complex to connect the mitochondria and sarcolemma via ankyrin B.

Theresa Bock, Clara Türk, Sriram Aravamudhan, Lena Keufgens, Wilhelm Bloch, Dieu Hien Rozsivalova, Vanina Romanello, Leonardo Nogara, Bert Blaauw, Aleksandra Trifunovic, Thomas Braun, Marcus Krüger

Nature communications 2021 Aug 12

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Skeletal muscle subsarcolemmal mitochondria (SSM) and intermyofibrillar mitochondria subpopulations have distinct metabolic activity and sensitivity, though the mechanisms that localize SSM to peripheral areas of muscle fibers are poorly understood. A protein interaction study and complexome profiling identifies PERM1 interacts with the MICOS-MIB complex. Ablation of Perm1 in mice reduces muscle force, decreases mitochondrial membrane potential and complex I activity, and reduces the numbers of SSM in skeletal muscle. We demonstrate PERM1 interacts with the intracellular adaptor protein ankyrin B (ANKB) that connects the cytoskeleton to the plasma membrane. Moreover, we identify a C-terminal transmembrane helix that anchors PERM1 into the outer mitochondrial membrane. We conclude PERM1 functions in the MICOS-MIB complex and acts as an adapter to connect the mitochondria with the sarcolemma via ANKB. © 2021. The Author(s).

Citation

Theresa Bock, Clara Türk, Sriram Aravamudhan, Lena Keufgens, Wilhelm Bloch, Dieu Hien Rozsivalova, Vanina Romanello, Leonardo Nogara, Bert Blaauw, Aleksandra Trifunovic, Thomas Braun, Marcus Krüger. PERM1 interacts with the MICOS-MIB complex to connect the mitochondria and sarcolemma via ankyrin B. Nature communications. 2021 Aug 12;12(1):4900