4.8 Article

Regulation of Photosynthesis in Bloom-Forming Cyanobacteria with the Simplest β-Diketone

Journal

ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 55, Issue 20, Pages 14173-14184

Publisher

AMER CHEMICAL SOC
DOI: 10.1021/acs.est.1c04683

Keywords

Acetylacetone; Microcystis aeruginosa; Algicide; Cyanocide; Harmful Algal Bloom

Funding

  1. Department of Chemistry at Umea University
  2. National Natural Science Foundation of China [22176087, 21976083]
  3. Key Technologies Research and Development Program of the Ministry of Science and Technology of the People's Republic of China [2018YFC1802003, 2019YFC0408302]

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The simplest beta-diketone, acetylacetone, is found to be a promising specific cyanocide, targeting bound iron species in the photosynthetic electron transport chain of Microcystis aeruginosa. This targeted binding approach outperforms the general oxidation mechanism in terms of specificity and eco-safety, providing a unique solution for the selective control of cyanobacteria.
Selective inhibition of photosynthesis is a fundamental strategy to solve the global challenge caused by harmful cyanobacterial blooms. However, there is a lack of specificity of the currently used cyanocides, because most of them act on cyanobacteria by generating nontargeted oxidative stress. Here, for the first time, we find that the simplest beta-diketone, acetylacetone, is a promising specific cyanocide, which acts on Microcystis aeruginosa through targeted binding on bound iron species in the photosynthetic electron transport chain, rather than by oxidizing the components of the photosynthetic apparatus. The targeted binding approach outperforms the general oxidation mechanism in terms of specificity and eco-safety. Given the essential role of photosynthesis in both natural and artificial systems, this finding not only provides a unique solution for the selective control of cyanobacteria but also sheds new light on the ways to modulate photosynthesis.

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