Siderophore-mediated iron uptake in cyanobacteria: current insights and knowledge gaps compared with model heterotrophic bacteria.

Cyanobacteria rely on siderophore-mediated iron uptake, but only a handful of cyanobacterial siderophores have been structurally identified, leaving biosynthesis, transport, and regulation incompletely understood.

• Why it matters: Iron scarcity strongly affects cyanobacterial physiology, including photosynthesis and nitrogen fixation, yet their siderophore systems are less characterized than those of model heterotrophic bacteria.
• What they did: The review compares known siderophore biosynthesis, transport, and regulatory systems in Escherichia coli and Pseudomonas aeruginosa with current cyanobacterial knowledge, emphasizing species-specific differences and missing mechanistic details.
• The result: It outlines key research directions—expanded structural characterization and deeper study of biosynthesis, transport, and regulation—to clarify ecological roles and support emerging heavy metal bioremediation applications.

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