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Title: Cooperation between two periplasmic copper chaperones is required for full activity of the cbb3-type cytochrome c oxidase and copper homeostasis in Rhodobacter capsulatus

Journal Article · · Molecular Microbiology
DOI:https://doi.org/10.1111/mmi.13321· OSTI ID:1344916
 [1];  [2];  [3];  [2];  [3];  [2]
  1. Institut fur Biochemie und Molekularbiologie, Freiburg (Germany); Albert-Ludwigs-Univ. Freiburg, Freiburg (Germany)
  2. Institut fur Biochemie und Molekularbiologie, Freiburg (Germany)
  3. 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)
Grant/Contract Number:
FG02-91ER20052
OSTI ID:
1344916
Journal Information:
Molecular Microbiology, Vol. 100, Issue 2; ISSN 0950-382X
Publisher:
WileyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

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Cited By (9)

Biochemical pathway for the biosynthesis of the Cu A center in bacterial cytochrome c oxidase journal July 2019
Cu Transport by the Extended Family of CcoA-like Transporters (CalT) in Proteobacteria journal February 2019
Handling of nutrient copper in the bacterial envelope journal January 2019
Transition metal transporters in rhizobia: tuning the inorganic micronutrient requirements to different living styles journal January 2019
The Cu chaperone CopZ is required for Cu homeostasis in Rhodobacter capsulatus and influences cytochrome cbb 3 oxidase assembly : CopZ controls Cu homeostasis journal January 2019
Medicago truncatula copper transporter 1 (MtCOPT1) delivers copper for symbiotic nitrogen fixation journal January 2018
Structural basis and mechanism for metallochaperone-assisted assembly of the Cu A center in cytochrome oxidase journal July 2019
Medicago truncatula copper transporter 1 (MtCOPT1) delivers copper for symbiotic nitrogen fixation posted_content January 2017
Structural basis and mechanism for metallochaperone-assisted assembly of the CuA center in cytochrome oxidase text January 2019