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IMAGE: Model of beta-barrel membrane protein pore biogenesis at the sorting and assembly machinery (SAM) of the outer mitochondrial membrane.
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Credit: Illustration: Nils Wiedemann
Mitochondria are vital for the human body as cellular powerhouses: They possess more than 1,000 different proteins, required for many central metabolic pathways. Disfunction of these lead to severe diseases, especially of the nervous system and the heart. In order to transport proteins and metabolites, mitochondria contain a special group of so-called beta-barrel membrane proteins, which form transport pores in the outer mitochondrial membrane. So far, scientists have not been able to explain the operating mode of the sorting and assembly machinery (SAM) for the biogenesis of these beta-barrel proteins. A team led by Prof. Dr. Toshiya Endo from Kyoto University/Japan, Prof. Dr. Nils Wiedemann and Prof. Dr. Nikolaus Pfanner from the University of Freiburg and Prof. Dr. Thomas Becker from the University of Bonn has now solved the structure and function of the SAM complex. The researchers have published their results in the journal