Biogenesis of the Essential Tim9 Tim10 Chaperone Complex of Mitochondria: SITE-SPECIFIC RECOGNITION OF CYSTEINE RESIDUES BY THE INTERMEMBRANE SPACE RECEPTOR Mia40. - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Article Dans Une Revue Journal of Biological Chemistry Année : 2007

Biogenesis of the Essential Tim9 Tim10 Chaperone Complex of Mitochondria: SITE-SPECIFIC RECOGNITION OF CYSTEINE RESIDUES BY THE INTERMEMBRANE SPACE RECEPTOR Mia40.

Résumé

The mitochondrial intermembrane space (IMS) contains an essential machinery for protein import and assembly (MIA). Biogenesis of IMS proteins involves a disulfide relay between precursor proteins, the cysteine-rich IMS protein Mia40 and the sulfhydryl oxidase Erv1. How precursor proteins are specifically directed to the IMS has remained unknown. Here we systematically analyzed the role of cysteine residues in the biogenesis of the essential IMS chaperone complex Tim9-Tim10. Although each of the four cysteines of Tim9, as well as of Tim10, is required for assembly of the chaperone complex, only the most amino-terminal cysteine residue of each precursor is critical for translocation across the outer membrane and interaction with Mia40. Mia40 selectively recognizes cysteine-containing IMS proteins in a site-specific manner in organello and in vitro. Our results indicate that Mia40 acts as a trans receptor in the biogenesis of mitochondrial IMS proteins.

Dates et versions

hal-00167509 , version 1 (21-08-2007)

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Citer

Dusanka Milenkovic, Kipros Gabriel, Bernard Guiard, Agnes Schulze-Specking, Nikolaus Pfanner, et al.. Biogenesis of the Essential Tim9 Tim10 Chaperone Complex of Mitochondria: SITE-SPECIFIC RECOGNITION OF CYSTEINE RESIDUES BY THE INTERMEMBRANE SPACE RECEPTOR Mia40.. Journal of Biological Chemistry, 2007, 282 (31), pp.22472-80. ⟨10.1074/jbc.M703294200⟩. ⟨hal-00167509⟩
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