The structure of the TOM core complex in the mitochondrial outer membrane.

Biological Chemistry
Thomas BauseweinStephan Nussberger

Abstract

In the past three decades, significant advances have been made in providing the biochemical background of TOM (translocase of the outer mitochondrial membrane)-mediated protein translocation into mitochondria. In the light of recent cryoelectron microscopy-derived structures of TOM isolated from Neurospora crassa and Saccharomyces cerevisiae, the interpretation of biochemical and biophysical studies of TOM-mediated protein transport into mitochondria now rests on a solid basis. In this review, we compare the subnanometer structure of N. crassa TOM core complex with that of yeast. Both structures reveal remarkably well-conserved symmetrical dimers of 10 membrane protein subunits. The structural data also validate predictions of weakly stable regions in the transmembrane β-barrel domains of the protein-conducting subunit Tom40, which signal the existence of β-strands located in interfaces of protein-protein interactions.

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Citations

Jan 23, 2020·Biological Chemistry·Alexander Grevel, Thomas Becker
Feb 12, 2021·International Journal of Molecular Sciences·Carmen A Mannella

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