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Siderophores that employ \u03b2-hydroxy-aspartate (\u03b2-OH-Asp) for iron chelation can undergo UV-mediated photolytic cleavage, simultaneously reducing Fe\n                      <jats:sup>3+<\/jats:sup>\n                      to Fe\n                      <jats:sup>2+<\/jats:sup>\n                      . Photolytic siderophores can promote algal-bacterial mutualism, where the bacteria provide iron in exchange for dissolved organic carbon. We present a comprehensive characterization of cyanochelin B, a photolytic \u03b2-OH-Asp-containing siderophore produced by the filamentous cyanobacterium\n                      <jats:italic toggle=\"yes\">Leptolyngbya<\/jats:italic>\n                      sp. NIES-3755. Combining nuclear magnetic resonance, high-resolution mass spectrometry, bioinformatic analyses, and Marfey\u2019s and Murata\u2019s method, we elucidated the structure of cyanochelin B, including the configuration of its stereocenters. Cyanochelin B-iron complexes rapidly photolyse under UV light (t\n                      <jats:sub>1\/2<\/jats:sub>\n                      = 2.3 min; 19.6 \u00b5mol m\n                      <jats:sup>\u22122<\/jats:sup>\n                      s\n                      <jats:sup>\u22121<\/jats:sup>\n                      UV-A) and release Fe\n                      <jats:sup>2+<\/jats:sup>\n                      . Using a coculture setup with\n                      <jats:italic toggle=\"yes\">Leptolyngbya<\/jats:italic>\n                      and\n                      <jats:italic toggle=\"yes\">Synechocystis<\/jats:italic>\n                      sp. PCC 6803 (a non-siderophore producer) in membrane-separated compartments and alginate-embedded FeCl\n                      <jats:sub>3<\/jats:sub>\n                      to simulate poorly accessible precipitated iron, we demonstrate cyanochelin B mode of actions. Our results show that in the absence of UV light, cyanochelin B efficiently monopolizes iron, favoring\n                      <jats:italic toggle=\"yes\">Leptolyngbya<\/jats:italic>\n                      . However, UV light eliminates this monopolization, making iron available to any cohabiting, also possibly competing, organisms. We further report isolating novel cyanochelin B-producing\n                      <jats:italic toggle=\"yes\">Phormidesmis<\/jats:italic>\n                      strains from field material and discuss the broader implications of photolytic siderophores. In conclusion, our interdisciplinary approach led to the discovery of a novel photolytic siderophore, cyanochelin B, and highlighted its possible role in distributing iron in microbial communities.\n                    <\/jats:p>\n                    <jats:sec>\n                      <jats:title>IMPORTANCE<\/jats:title>\n                      <jats:p>Iron is an essential micronutrient that is required by all living organisms as a cofactor of indispensable enzymes. Due to its specific properties, it is mostly precipitated and is biologically unavailable. Microbes produce siderophores, low-molecular-weight compounds that bind iron, to facilitate iron uptake. Siderophores are mediators of microbial interactions and facilitate competitive exclusion of non-compatible strains or support mutualistic partners and cheater strains. Here, we adopt an interdisciplinary strategy and report a complete structural elucidation of cyanochelin B, a photolytic cyanobacterial siderophore that contains \u03b2-hydroxy-aspartate (\u03b2-OH-Asp). Our coculture experiments show that cyanochelin B can either monopolize iron to its producer or make it accessible to other strains, depending on the presence of UV light. Moreover, our data suggest that the benefits from production of photolytic siderophores are not restricted to the producer or cohabiting bacteria but are rather available to the entire irradiated community. Out of the known siderophores, 17.5% contain the photoreactive \u03b2-OH-Asp and therefore may play a similar role.<\/jats:p>\n                    <\/jats:sec>\n                  <\/jats:sec>","DOI":"10.1128\/aem.02566-24","type":"journal-article","created":{"date-parts":[[2025,10,15]],"date-time":"2025-10-15T13:30:08Z","timestamp":1760535008000},"update-policy":"https:\/\/doi.org\/10.1128\/asmj-crossmark-policy-page","source":"Crossref","is-referenced-by-count":6,"title":["Cyanochelin B: a cyanobacterium-produced siderophore with photolytic properties that negate iron monopolization in UV light"],"prefix":"10.1128","volume":"91","author":[{"given":"Berness P.","family":"Falcao","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/02p1jz666","id-type":"ROR","asserted-by":"publisher"}],"name":"Centre Algatech, Institute of Microbiology of the Czech Academy of Sciences","place":["T\u0159ebo\u0148, Czech Republic"]},{"name":"Faculty of Science, University of South 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