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The biosynthesis of bacterial and plastidic c-type cytochromes

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Abstract

The biosynthesis of bacterial and plastidic c-type cytochromes includes several steps that occur post-translationally. In the case of bacterial cytochromes, the cytosolically synthesized pre-proteins are translocated across the cytoplasmic membrane, the pre-proteins are cleaved to their mature forms and heme is ligated to the processed apoprotein. Although heme attachment has not been studied extensively at the biochemical level, molecular genetic approaches suggest that the reaction generally occurs after translocation of the apoprotein to the periplasm. Recent studies with Bradyrhizobium japonicum and Rhodobacter capsulatus indicate that the process of heme attachment requires the function of a large number of genes. Mutation of these genes generates a pleiotropic deficiency in all c-type cytochromes, suggesting that the gene products participate in processes required for the biosynthesis of all c-type cytochromes. In eukaryotic cells, the biosynthesis of photosynthetic c-type cytochromes is somewhat more complex owing to the additional level of compartmentation. Nevertheless, the basic features of the pathway appear to be conserved. For instance, as is the case in bacteria, translocation and processing of the pre-proteins is not dependent on heme attachment. Genetic analysis suggests that the nuclear as well as the plastid genomes encode functions required for heme attachment, and that these genes function in the biosynthesis of the membrane-associated as well as the soluble c-type cytochrome of chloroplasts. A feature of cytochromes c biogenesis that appears to be conserved between chloroplasts and mitochondria is the sub-cellular location of the heme attachment reaction (p-side of the energy transducing membrane). Continued investigation of all three experimental systems (bacteria, chloroplasts, mitochondria) is likely to lead to a greater understanding of the biochemistry of cytochrome maturation as well as the more general problem of cofactor-protein association during the assembly of an energy transducing membrane.

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Abbreviations

CCHL:

cytochrome c/heme lyase

CC1HL:

cytochrome cl/heme lyase

cyt:

cytochrome

EMS:

ethyl methane sulphonate

n-side:

electrochemically negative side of an energy transducing membrane

p-side:

electrochemically positive side of an energy transducing membrane

PhoA:

alkaline phosphatase (encoded by the phoA locus)

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Howe, G., Merchant, S. The biosynthesis of bacterial and plastidic c-type cytochromes. Photosynth Res 40, 147–165 (1994). https://doi.org/10.1007/BF00019332

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