Abstract
The process of oxidative folding in the intermembrane mitochondrial space (IMS) is an exciting field of research because folding is simultaneously coupled to protein translocation and functional regulation. Contrary to the endoplasmatic reticulum ER where several chaperones of the disulfide isomerase family exist, oxidative folding in the IMS is exclusively catalyzed by the oxoreductase Mia40 that recognizes a group of proteins with characteristic cysteine motifs organized in twin CX3C, twin CX9C or CX2C motifs. In this review, we discuss the structural and biochemical studies leading to our current understanding of the Mia40 pathway as well as the open questions on the field. In fact, despite significant advances, several key points on the Mia40 pathway remain to clarify namely on the molecular mechanism trough which substrate oxidative folding is catalyzed. This issue is receiving increasing attention since failures in the import, sorting and folding of mitochondrial proteins is related to an increasing number of debilitating human disorders.
Keywords: cysteine motifs, disulfide bonds, Erv1, intermembrane space, Mia40, mitochondria, oxidative protein folding, protein import, IMS, mitochondrial membranes
Current Protein & Peptide Science
Title:Protein Oxidative Folding in the Intermembrane Mitochondrial Space: More than Protein Trafficking
Volume: 13 Issue: 3
Author(s): Hugo Fraga and Salvador Ventura
Affiliation:
Keywords: cysteine motifs, disulfide bonds, Erv1, intermembrane space, Mia40, mitochondria, oxidative protein folding, protein import, IMS, mitochondrial membranes
Abstract: The process of oxidative folding in the intermembrane mitochondrial space (IMS) is an exciting field of research because folding is simultaneously coupled to protein translocation and functional regulation. Contrary to the endoplasmatic reticulum ER where several chaperones of the disulfide isomerase family exist, oxidative folding in the IMS is exclusively catalyzed by the oxoreductase Mia40 that recognizes a group of proteins with characteristic cysteine motifs organized in twin CX3C, twin CX9C or CX2C motifs. In this review, we discuss the structural and biochemical studies leading to our current understanding of the Mia40 pathway as well as the open questions on the field. In fact, despite significant advances, several key points on the Mia40 pathway remain to clarify namely on the molecular mechanism trough which substrate oxidative folding is catalyzed. This issue is receiving increasing attention since failures in the import, sorting and folding of mitochondrial proteins is related to an increasing number of debilitating human disorders.
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Cite this article as:
Fraga Hugo and Ventura Salvador, Protein Oxidative Folding in the Intermembrane Mitochondrial Space: More than Protein Trafficking, Current Protein & Peptide Science 2012; 13 (3) . https://dx.doi.org/10.2174/138920312800785012
DOI https://dx.doi.org/10.2174/138920312800785012 |
Print ISSN 1389-2037 |
Publisher Name Bentham Science Publisher |
Online ISSN 1875-5550 |
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