Widespread Distribution and Functional Specificity of the Copper Importer CcoA: Distinct Cu Uptake Routes for Bacterial Cytochrome c Oxidases
Abstract
ABSTRACT Cytochromecoxidases are members of the heme-copper oxidase superfamily. These enzymes have different subunits, cofactors, and primary electron acceptors, yet they all contain identical heme-copper (CuB) binuclear centers within their catalytic subunits. The uptake and delivery pathways of the CuBatom incorporated into this active site, where oxygen is reduced to water, are not well understood. Our previous work with the facultative phototrophic bacteriumRhodobacter capsulatusindicated that the copper atom needed for the CuBsite ofcbb3-type cytochromecoxidase (cbb3-Cox) is imported to the cytoplasm by a major facilitator superfamily-type transporter, CcoA. In this study, a comparative genomic analysis of CcoA orthologs in alphaproteobacterial genomes showed that CcoA is widespread among organisms and frequently co-occurs with cytochromecoxidases. To define the specificity of CcoA activity, we investigated its function inRhodobacter sphaeroides, a close relative ofR. capsulatusthat contains bothcbb3- andaa3-Cox. Phenotypic, genetic, and biochemical characterization of mutants lacking CcoA showed that in its absence, or even in the presence of its bypass suppressors, only the production ofcbb3-Cox and not that ofaa3-Cox was affected. We therefore concluded that CcoA is dedicated solely tocbb3-Cox biogenesis, establishing that distinct copper uptake systems provide the CuBatoms to the catalytic sites of these two similar cytochromecoxidases. These findings illustrate the large variety ofmore »
- Authors:
-
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Biology; Univ. of Pau and Pays de l'Adour, Pau (France). Faculty of Environmental Microbiology and Inst. of Analytical Sciences and Physico-Chemistry for Environment and Materials (IPREM)
- Univ. of Pennsylvania, Philadelphia, PA (United States). Dept. of Biology
- Brookhaven National Lab. (BNL), Upton, NY (United States). Biology Dept.
- Albert Ludwigs Univ. of Freiburg, Freiburg (Germany). Inst. for Biochemistry and Molecular Biology and Center for Biochemistry and Molecular Cell Research (ZBMZ) and Faculty of Medicine
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division; National Institutes of Health (NIH); German Research Foundation (DFG)
- OSTI Identifier:
- 1422646
- Alternate Identifier(s):
- OSTI ID: 1426445
- Report Number(s):
- BNL-203362-2018-JAAM
Journal ID: ISSN 2150-7511; e00065-18
- Grant/Contract Number:
- SC0012704; FG02-91ER20052; 38237; IRTG 1478; RTG 2202
- Resource Type:
- Published Article
- Journal Name:
- mBio (Online)
- Additional Journal Information:
- Journal Name: mBio (Online) Journal Volume: 9 Journal Issue: 1; Journal ID: ISSN 2150-7511
- Publisher:
- American Society for Microbiology
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; CcoA; cytochrome; copper homeostasis; copper transport; copper uptake; cytochrome biogenesis; cytochrome c oxidase
Citation Formats
Khalfaoui-Hassani, Bahia, Wu, Hongjiang, Blaby-Haas, Crysten E., Zhang, Yang, Sandri, Federica, Verissimo, Andreia F., Koch, Hans-Georg, and Daldal, Fevzi. Widespread Distribution and Functional Specificity of the Copper Importer CcoA: Distinct Cu Uptake Routes for Bacterial Cytochrome c Oxidases. United States: N. p., 2018.
Web. doi:10.1128/mBio.00065-18.
Khalfaoui-Hassani, Bahia, Wu, Hongjiang, Blaby-Haas, Crysten E., Zhang, Yang, Sandri, Federica, Verissimo, Andreia F., Koch, Hans-Georg, & Daldal, Fevzi. Widespread Distribution and Functional Specificity of the Copper Importer CcoA: Distinct Cu Uptake Routes for Bacterial Cytochrome c Oxidases. United States. https://doi.org/10.1128/mBio.00065-18
Khalfaoui-Hassani, Bahia, Wu, Hongjiang, Blaby-Haas, Crysten E., Zhang, Yang, Sandri, Federica, Verissimo, Andreia F., Koch, Hans-Georg, and Daldal, Fevzi. Tue .
"Widespread Distribution and Functional Specificity of the Copper Importer CcoA: Distinct Cu Uptake Routes for Bacterial Cytochrome c Oxidases". United States. https://doi.org/10.1128/mBio.00065-18.
@article{osti_1422646,
title = {Widespread Distribution and Functional Specificity of the Copper Importer CcoA: Distinct Cu Uptake Routes for Bacterial Cytochrome c Oxidases},
author = {Khalfaoui-Hassani, Bahia and Wu, Hongjiang and Blaby-Haas, Crysten E. and Zhang, Yang and Sandri, Federica and Verissimo, Andreia F. and Koch, Hans-Georg and Daldal, Fevzi},
abstractNote = {ABSTRACT Cytochromecoxidases are members of the heme-copper oxidase superfamily. These enzymes have different subunits, cofactors, and primary electron acceptors, yet they all contain identical heme-copper (CuB) binuclear centers within their catalytic subunits. The uptake and delivery pathways of the CuBatom incorporated into this active site, where oxygen is reduced to water, are not well understood. Our previous work with the facultative phototrophic bacteriumRhodobacter capsulatusindicated that the copper atom needed for the CuBsite ofcbb3-type cytochromecoxidase (cbb3-Cox) is imported to the cytoplasm by a major facilitator superfamily-type transporter, CcoA. In this study, a comparative genomic analysis of CcoA orthologs in alphaproteobacterial genomes showed that CcoA is widespread among organisms and frequently co-occurs with cytochromecoxidases. To define the specificity of CcoA activity, we investigated its function inRhodobacter sphaeroides, a close relative ofR. capsulatusthat contains bothcbb3- andaa3-Cox. Phenotypic, genetic, and biochemical characterization of mutants lacking CcoA showed that in its absence, or even in the presence of its bypass suppressors, only the production ofcbb3-Cox and not that ofaa3-Cox was affected. We therefore concluded that CcoA is dedicated solely tocbb3-Cox biogenesis, establishing that distinct copper uptake systems provide the CuBatoms to the catalytic sites of these two similar cytochromecoxidases. These findings illustrate the large variety of strategies that organisms employ to ensure homeostasis and fine control of copper trafficking and delivery to the target cuproproteins under different physiological conditions. IMPORTANCEThecbb3- andaa3-type cytochromecoxidases belong to the widespread heme-copper oxidase superfamily. They are membrane-integral cuproproteins that catalyze oxygen reduction to water under hypoxic and normoxic growth conditions. These enzymes diverge in terms of subunit and cofactor composition, yet they all share a conserved heme-copper binuclear site within their catalytic subunit. In this study, we show that the copper atoms of the catalytic center of two similar cytochromecoxidases from this superfamily are provided by different copper uptake systems during their biogenesis. This finding illustrates different strategies by which organisms fine-tune the trafficking of copper, which is an essential but toxic micronutrient.},
doi = {10.1128/mBio.00065-18},
journal = {mBio (Online)},
number = 1,
volume = 9,
place = {United States},
year = {Tue Feb 27 00:00:00 EST 2018},
month = {Tue Feb 27 00:00:00 EST 2018}
}
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