Cu Homeostasis in Bacteria: The Ins and Outs
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Copper (Cu) is an essential trace element for all living organisms and used as cofactor in key enzymes of important biological processes, such as aerobic respiration or superoxide dismutation. However, due to its toxicity, cells have developed elaborate mechanisms for Cu homeostasis, which balance Cu supply for cuproprotein biogenesis with the need to remove excess Cu. This review summarizes our current knowledge on bacterial Cu homeostasis with a focus on Gram-negative bacteria and describes the multiple strategies that bacteria use for uptake, storage and export of Cu. We furthermore describe general mechanistic principles that aid the bacterial response to toxic Cu concentrations and illustrate dedicated Cu relay systems that facilitate Cu delivery for cuproenzyme biogenesis. Progress in understanding how bacteria avoid Cu poisoning while maintaining a certain Cu quota for cell proliferation is of particular importance for microbial pathogens because Cu is utilized by the host immune system for attenuating pathogen survival in host cells.
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The thiolate coordination chemistry of Hg2+ provides a model for how Hg2+ can transfer between resistance proteins MerT, MerR, and MerA and foreshadowed the similar pathway for Cu+ transfer between chaperones and client proteins.
“This provides a model for how Hg2+ can transfer between resistance proteins that function in transport (MerT), sensing (MerR), and reduction (MerA) and foreshadowed the similar pathway described for the transfer of Cu+ between chaperones and client proteins.196,211”
From Metals in Motion: Understanding Labile Metal Pools in Bacteria (2025) · cites this paper as [196]
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Metals in Motion: Understanding Labile Metal Pools in Bacteria
Helmann, J. D. (2025) · Biochemistry · doi:10.1021/acs.biochem.4c00726 · Cited by 49 · see citing works
- Authors
- Andrei, A., Öztürk, Y., Khalfaoui-Hassani, B., Rauch, J., Marckmann, D., Trasnea, P.-I., Daldal, F., & Koch, H.-G.
- Affiliations
- University of Freiburg (DE)
- Centre National de la Recherche Scientifique (FR)
- Institute of Science and Technology Austria (AT)
- University of Pennsylvania (US)
- Corresponding author
- Koch, Hans-Georg
- Venue
- Membranes
- Publisher
- MDPI AG
- Published
- 2020-09-18
- Volume
- 10
- Issue
- 9
- Pages
- 242
- ISSN
- 2077-0375 (ISSN-L)
- PMC
- PMC7558416
- OpenAlex
- W3087451181
- Cited by
- 153
- References
- 8
- Citations by year
- 2026: 24 · 2025: 36 · 2024: 32 · 2023: 20 · 2022: 23 · 2021: 18
- FWCI
- 2.19
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Licence
- Locations
- Membranes (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Institute of Science and Technology Austria (submittedVersion, cc-by)
- HAL (submittedVersion, other-oa)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- Funders
- Deutsche Forschungsgemeinschaft (KO2184/8, KO2184/9, ID 4032222702/SFB1381, ID 235777276/GRK2202)
- National Institutes of Health (GM38237)
- U.S. Department of Energy (DE-FG02-91ER20052)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Bacterial Genetics and Biotechnology
- Health Sciences › Nursing › Nutrition and Dietetics › Trace Elements in Health
- Physical Sciences › Chemistry › Inorganic Chemistry › Metal-Catalyzed Oxygenation Mechanisms
- Keywords
- copper homeostasis, copper uptake, copper storage, copper exports, copper enzymes, copper toxicity, Gram-negative bacteria, pathogenic microorganisms, host immune response
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