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The YTA10-12 complex, an AAA protease with chaperone-like activity in the inner membrane of mitochondria.

Authors:
Arlt H, Tauer R, Feldmann H, Neupert W, Langer T
Affiliation:
Journal:
Cell

Abstract

The mitochondrial members of the highly conserved AAA family, Yta10p and Yta12p, constitute a membrane-embedded complex of about 850 kDa. As an ATP dependent metallopeptidase (AAA protease), the YTA10-12 complex mediates the degradation of nonassembled inner membrane proteins. In contrast to nucleotide-dependent complex formation and substrate binding, proteolysis of bound polypeptides depends on the hydrolysis of ATP and the metallopeptidase activity of both subunits. Independent of its proteolytic function, the chaperone-like activity of the YTA10-12 complex is required for assembly of the membrane-associated ATP synthase. We propose that proteolytic and chaperone-like activities in the YTA10-12 complex mediate assembly and degradation processes of membrane protein complexes and thereby exert key functions in the maintenance of membrane integrity.

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