Summary
In most anoxygenic phototrophic bacteria, apocytochromes c are synthesized in the cytoplasm, translocated across the membrane and matured to holocytochromes c on the periplasmic side. The extracytoplasmic maturation process requires a complex biogenesis pathway (Ccm-system I) consisting of up to ten components to carry out specific steps. These include translocation and delivery of the heme, chaperoning and thio-oxidoreduction of the apocytochrome c as well as heme ligation steps. Because cytochromes are often part of multi-subunit protein complexes, matured holocytochromes may be assembled into active enzyme complexes. Examples include the ubihydroquinone:cytochrome c oxidoreductase (cytochrome bc 1 complex) or the aa 3- or cbb 3-type cytochrome c oxidases. Assemblies of these complexes are tightly coordinated and often require additional specific biogenesis components. In this chapter, we discuss the maturation process of c-type cytochromes and the assembly pathways of the aa 3- and cbb 3-type cytochrome c oxidases in anoxygenic phototrophic bacteria, with a specific focus on Rhodobacter species.
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Abbreviations
- aa3-Cox:
-
aa3-type Cyt c oxidase
- apoCyt:
-
immature Cyt c without its heme cofactor attached
- B. :
-
bacillus
- BN-PAGE:
-
blue-native polyacrylamide gel electrophoresis
- cbb3-Cox:
-
cbb3-type Cyt c oxidase
- Ccm:
-
cytochrome c maturation system I
- Ccs:
-
cytochrome maturation system II
- Cyt:
-
cytochrome
- holo- and apo-CcmE:
-
CcmE with and without its heme cofactor, respectively
- holoCyt:
-
mature Cyt c with its heme cofactor attached
- pre-apoCyt:
-
apoCyt c precursor with its signal sequence
- Ps:
-
photosynthetic
- Rba. :
-
Rhodobacter
- Res:
-
respiratory
- TPR:
-
Tetratricopeptide repeats
- WWD:
-
Tryptophan rich motif
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Sanders, C. et al. (2009). Biogenesis of c-type Cytochromes and Cytochrome Complexes. In: Hunter, C.N., Daldal, F., Thurnauer, M.C., Beatty, J.T. (eds) The Purple Phototrophic Bacteria. Advances in Photosynthesis and Respiration, vol 28. Springer, Dordrecht. https://doi.org/10.1007/978-1-4020-8815-5_21
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