The mitochondrial cytochrome c N-terminal region is critical for maturation by holocytochrome c synthase.
The covalent attachment of heme to mitochondrial cytochrome c is catalysed by holocytochrome c synthase (HCCS, also called heme lyase). How HCCS functions and recognises the substrate apocytochrome is unknown. Here we have examined HCCS recognition of a chimeric substrate comprising a short mitochondrial cytochrome c N-terminal region with the C-terminal sequence, including the CXXCH heme-binding motif, of a bacterial cytochrome c that is not otherwise processed by HCCS. Heme attachment to th...Expand abstract
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