page_title: Siderophore
section_title: Diversity
hierarchical_section_title: Siderophore / Diversity
caption_attribution_description: English: Chemical structure diagram - Azotbactin.
context_page_description: Siderophores are small, high-affinity iron-chelating compounds that are secreted by microorganisms such as bacteria and fungi and serve primarily to transport iron across cell membranes, although a widening range of siderophore functions is now being appreciated. Siderophores are among the strongest soluble Fe³⁺ binding agents known.
context_section_description: Examples of siderophores produced by various bacteria and fungi:
   
  Hydroxamate siderophores
  Catecholate siderophores
  Mixed ligands
  A comprehensive list of siderophore structures (over 250) is presented in Appendix 1 in reference.
caption: Azotobactin, a mixed-ligand siderophore
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