Microbial copper transport system

The microbial copper transport system is a complex multi-protein network essential for maintaining copper homeostasis in bacteria and fungi (NIH, 2021). It comprises several key components, including P-type ATPases (e.g., CopA), RND-type efflux systems (e.g., CusCFBA), copper chaperones (e.g., CopZ), and metal-sensing transcriptional regulators (e.g., CueR) (MDPI, 2022; ResearchGate, 2024). These proteins coordinate the uptake of copper for essential cuproenzymes and the efflux of excess copper to prevent cellular damage (NIH, 2021). Copper toxicity in microbes primarily occurs through the displacement of iron from iron-sulfur clusters in metabolic enzymes and the generation of reactive oxygen species via Fenton-like reactions (Duke, 2023). This system is a critical therapeutic target because the host immune system, particularly macrophages, utilizes copper as a bactericidal tool within the phagosome (ACS, 2014). Drugs targeting this system include copper ionophores such as pyrithione and disulfiram, which bypass natural transport mechanisms to flood the microbial cytoplasm with toxic levels of copper, thereby enhancing the host's ability to clear infections (Duke, 2023; NIH, 2021).

Other names

Copper transport across microbial membranesBacterial copper homeostasis systemMicrobial copper efflux systemBacterial copper resistance system

Facilitation of copper influx via ionophores or inhibition of copper efflux transporters to induce toxic intracellular copper accumulation.