The copper-deprivation stimulon of Corynebacterium glutamicum comprises proteins for biogenesis of the actinobacterial cytochrome bc1 -aa3 supercomplex

The Journal of Biological Chemistry
Xenia MorosovMichael Bott

Abstract

Aerobic respiration in Corynebacterium glutamicum involves a cytochrome bc1-aa3 supercomplex with a diheme cytochrome c1, which is the only c-type cytochrome in this species. This organization is considered as typical for aerobic Actinobacteria. Whereas the biogenesis of heme-copper type oxidases like cytochrome aa3 has been studied extensively in α-proteobacteria, yeast, and mammals, nothing is known about this process in Actinobacteria. Here, we searched for assembly proteins of the supercomplex by identifying the copper-deprivation stimulon, which might include proteins that insert copper into cytochrome aa3 Using gene expression profiling, we found two copper starvation-induced proteins for supercomplex formation. The Cg2699 protein, named CtiP, contained 16 predicted transmembrane helices, and its sequence was similar to that of the copper importer CopD of Pseudomonas syringae in the N-terminal half and to the cytochrome oxidase maturation protein CtaG of Bacillus subtilis in its C-terminal half. CtiP deletion caused a growth defect similar to that produced by deletion of subunit I of cytochrome aa3, increased copper tolerance, triggered expression of the copper-deprivation stimulon under copper sufficiency, and prevented ...Continue Reading

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