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Reference: Bonnard G, et al. (2010) Redox Processes Controlling the Biogenesis of c-Type Cytochromes. Antioxid Redox Signal 13(9):1385-401

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Abstract


In mitochondria two mono heme c-type cytochromes are essential electron shuttles of the respiratory chain. They are characterized by the covalent attachment of their heme C to a CXXCH motif in the apoproteins. This post-translational modification occurs in the intermembrane space compartment. Dedicated assembly pathways have evolved to achieve this chemical reaction that requires a strict reducing environment. In mitochondria, two unrelated machineries operate, the rather simple System III in yeast and animals and System I in plants and some protozoans. System I is also found in bacteria and share some common features with System II that operates in bacteria and plastids. This review aims at presenting how different systems control the chemical requirements for the heme ligation in the compartments where cytochrome c maturation takes place. A special emphasis will be given on the redox processes that are required for the heme attachment reaction onto apocytochromes c.

Reference Type
Journal Article
Authors
Bonnard G, Corvest V, Meyer EH, Hamel P
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