Fungal biomineralization of toxic metals accelerates organic pollutant removal.

Autor:	Li Q; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China., Zhang M; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China., Wei B; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China., Lan W; Pipechina Institute of Science and Technology, No. 51 Jinguang Road, Guangyang District, Langfang 065000, China., Wang Q; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China., Chen C; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China., Zhao H; Key Laboratory of Water and Sediment Sciences (Ministry of Education), College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Shanxi Laboratory for Yellow River, College of Environmental and Resource Sciences, Shanxi University, Taiyuan 030006, China., Liu D; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China. Electronic address: liudaoqing@cup.edu.cn., Gadd GM; State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249, China; Geomicrobiology Group, School of Life Sciences, University of Dundee, Dundee, Scotland DD1 5EH, UK. Electronic address: g.m.gadd@dundee.ac.uk.
Jazyk:	angličtina
Zdroj:	Current biology : CB [Curr Biol] 2024 May 20; Vol. 34 (10), pp. 2077-2084.e3. Date of Electronic Publication: 2024 Apr 24.
DOI:	10.1016/j.cub.2024.04.005
Abstrakt:	Fungal biomineralization plays an important role in the biogeochemical cycling of metals in the environment and has been extensively explored for bioremediation and element biorecovery. However, the cellular and metabolic responses of fungi in the presence of toxic metals during biomineralization and their impact on organic matter transformations are unclear. This is an important question because co-contamination by toxic metals and organic pollutants is a common phenomenon in the natural environment. In this research, the biomineralization process and oxidative stress response of the geoactive soil fungus Aspergillus niger were investigated in the presence of toxic metals (Co, Cu, Mn, and Fe) and the azo dye orange II (AO II). We have found that the co-existence of toxic metals and AO II not only enhanced the fungal biomineralization of toxic metals but also accelerated the removal of AO II. We hypothesize that the fungus and in situ mycogenic biominerals (toxic metal oxalates) constituted a quasi-bioreactor, where the biominerals removed organic pollutants by catalyzing reactive oxygen species (ROS) generation resulting from oxidative stress. We have therefore demonstrated that a fungal/biomineral system can successfully achieve the goal of toxic metal immobilization and organic pollutant decomposition. Such findings inform the potential development of fungal-biomineral hybrid systems for mixed pollutant bioremediation as well as provide further understanding of fungal organic-inorganic pollutant transformations in the environment and their importance in biogeochemical cycles. Competing Interests: Declaration of interests The authors declare no competing interests. (Copyright © 2024 Elsevier Inc. All rights reserved.)
Databáze:	MEDLINE
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