Cyanochelin B: a cyanobacterium-produced siderophore with photolytic properties that negate iron monopolization in UV light

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60077344%3A_____%2F25%3A00646954" target="_blank" >RIV/60077344:_____/25:00646954 - isvavai.cz</a>

Alternative codes found

RIV/61388971:_____/25:00642855 RIV/60077344:_____/25:00642855 RIV/60076658:12310/25:43910288 RIV/00216224:14310/25:00142601

Result on the web

<a href="https://doi.org/10.1128/aem.02566-24" target="_blank" >https://doi.org/10.1128/aem.02566-24</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1128/aem.02566-24" target="_blank" >10.1128/aem.02566-24</a>

Result language

angličtina

Original language name

Cyanochelin B: a cyanobacterium-produced siderophore with photolytic properties that negate iron monopolization in UV light

Original language description

Siderophores are low-molecular-weight compounds excreted by microorganisms to acquire iron and possibly to monopolize iron resource to achieve competitive advantage over other strains, or to trade for other substrates in mutualistic relationships. Siderophores that employ beta-hydroxy-aspartate (beta-OH-Asp) for iron chelation can undergo UV-mediated photolytic cleavage, simultaneously reducing Fe3+ to Fe2+. 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 beta-OH-Asp-containing siderophore produced by the filamentous cyanobacterium Leptolyngbya sp. NIES-3755. Combining nuclear magnetic resonance, high-resolution mass spectrometry, bioinformatic analyses, and Marfey's and Murata's method, we elucidated the structure of cyanochelin B, including the configuration of its stereocenters. Cyanochelin B-iron complexes rapidly photolyse under UV light (t1/2 = 2.3 min., 19.6 mu mol m-2 s-1 UV-A) and release Fe2+. Using a coculture setup with Leptolyngbya and Synechocystis sp. PCC 6803 (a non-siderophore producer) in membrane-separated compartments and alginate-embedded FeCl3 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 Leptolyngbya. However, UV light eliminates this monopolization, making iron available to any cohabiting, also possibly competing, organisms. We further report isolating novel cyanochelin B-producing Phormidesmis 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.IMPORTANCEIron 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 beta-hydroxy-aspartate (beta-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 beta-OH-Asp and therefore may play a similar role.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10606 - Microbiology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Applied and Environmental Microbiology

ISSN

0099-2240

e-ISSN

1098-5336

Volume of the periodical

91

Issue of the periodical within the volume

11

Country of publishing house

US - UNITED STATES

Number of pages

23

Pages from-to

e02566-24

UT code for WoS article

001593289900001

EID of the result in the Scopus database

2-s2.0-105022236240