Bacterial iron-dependent enzymes and respiratory chain components

Bacterial iron-dependent enzymes and respiratory chain components are a diverse group of proteins essential for the survival, replication, and energy metabolism of pathogenic bacteria (Goss et al., 2018) [11.2.1]. This target group includes key enzymes such as ribonucleotide reductase, which is required for DNA synthesis, and various components of the electron transport chain, such as cytochromes and NADH dehydrogenases, which drive ATP production [11.2.3]. Many of these proteins rely on iron or heme cofactors to facilitate critical redox reactions [11.2.5]. Because bacteria have a high demand for iron to maintain these processes, these components are vulnerable to therapeutic intervention, particularly in iron-limited environments like the human host [11.2.1]. Drugs targeting this group, most notably gallium-based compounds like gallium nitrate and gallium maltolate, function by mimicking the iron ion (Fe3+) [11.2.2]. Gallium is taken up by bacterial iron acquisition systems but cannot undergo the redox cycling necessary for enzyme function, leading to the inactivation of multiple iron-dependent pathways [11.2.5]. This Trojan horse mechanism results in the inhibition of DNA replication, disruption of energy metabolism, and increased sensitivity to oxidative stress [11.2.3]. This multi-target strategy is particularly effective against biofilm-forming pathogens, such as Pseudomonas aeruginosa in cystic fibrosis patients, where conventional antibiotics often fail [11.2.1]. Other drugs, such as clofazimine, specifically target respiratory chain components like NADH dehydrogenase to disrupt bacterial bioenergetics [11.1.2].

Other names

Bacterial iron-dependent proteinsBacterial respiratory chainBacterial metalloenzymesIron-dependent bacterial pathways

Competitive inhibition of iron-binding sites by redox-inactive mimetics and direct inhibition of respiratory chain complexes to disrupt bacterial bioenergetics and metabolism.