Cooperation between two periplasmic copper chaperones is required for full activity of the cbb3-type cytochrome c oxidase and copper homeostasis in Rhodobacter capsulatus
- Institut fur Biochemie und Molekularbiologie, Freiburg (Germany); Albert-Ludwigs-Univ. Freiburg, Freiburg (Germany); DOE Office of Scientific and Technical Information (OSTI)
- Institut fur Biochemie und Molekularbiologie, Freiburg (Germany)
- Univ. of Pennsylvania, Philadelphia, PA (United States)
Copper (Cu) is an essential micronutrient that functions as a cofactor in several important enzymes, like respiratory heme-copper oxygen reductases. Yet, Cu is also toxic and therefore cells engage a highly coordinated Cu uptake and delivery system to prevent the accumulation of toxic Cu concentrations. In the current work we analyzed Cu delivery to the cbb3-type cytochrome c oxidase (cbb3-Cox) of Rhodobacter capsulatus. We identified the PCuAC-like periplasmic chaperone PccA and analyzed its contribution to cbb3-Cox assembly. Our data demonstrate that PccA is a Cu-binding protein with a preference for Cu(I), which is required for efficient cbb3-Cox assembly, in particular at low Cu concentrations. By using in vivo and in vitro crosslinking we show that PccA forms a complex with the Sco1-homologue SenC. This complex is stabilized in the absence of the cbb3-Cox specific assembly factors CcoGHIS. In cells lacking SenC, the cytoplasmic Cu content is significantly increased, but the simultaneous absence of PccA prevents this Cu accumulation. Lastly, these data demonstrate that the interplay between PccA and SenC is not only required for Cu delivery during cbb3-Cox assembly, but that it also regulates Cu homeostasis in R. capsulatus.
- Research Organization:
- Univ. of Pennsylvania, Philadelphia, PA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Grant/Contract Number:
- FG02-91ER20052
- OSTI ID:
- 1344916
- Journal Information:
- Molecular Microbiology, Journal Name: Molecular Microbiology Journal Issue: 2 Vol. 100; ISSN 0950-382X
- Publisher:
- WileyCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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