Fungal-Mineral Interactions Modulating Intrinsic Peroxidase-like Activity of Iron Nanoparticles: Implications for the Biogeochemical Cycles of Nutrient Elements and Attenuation of Contaminants

Zhi-Lai Chi, Guang-Hui Yu (Lead / Corresponding author), Andreas Kappler, Cong-Qiang Liu, Geoffrey Michael Gadd

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

Fungal-mediated extracellular reactive oxygen species (ROS) are essential for biogeochemical cycles of carbon, nitrogen, and contaminants in terrestrial environments. These ROS levels may be modulated by iron nanoparticles that possess intrinsic peroxidase (POD)-like activity (nanozymes). However, it remains largely undescribed how fungi modulate the POD-like activity of the iron nanoparticles with various crystallinities and crystal facets. Using well-controlled fungal-mineral cultivation experiments, here, we showed that fungi possessed a robust defect engineering strategy to modulate the POD-like activity of the attached iron minerals by decreasing the catalytic activity of poorly ordered ferrihydrite but enhancing that of well-crystallized hematite. The dynamics of POD-like activity were found to reside in molecular trade-offs between lattice oxygen and oxygen vacancies in the iron nanoparticles, which may be located in a cytoprotective fungal exoskeleton. Together, our findings unveil coupled POD-like activity and oxygen redox dynamics during fungal-mineral interactions, which increase the understanding of the catalytic mechanisms of POD-like nanozymes and microbial-mediated biogeochemical cycles of nutrient elements as well as the attenuation of contaminants in terrestrial environments.

Original languageEnglish
Pages (from-to)672-680
Number of pages9
JournalEnvironmental Science and Technology
Volume56
Issue number1
Early online date14 Dec 2021
DOIs
Publication statusPublished - 4 Jan 2022

Keywords

  • Fenton reaction
  • cytoprotective exoskeleton
  • fungal biomineralization
  • iron (oxyhydr)oxide
  • molecular trade-offs
  • nanozyme
  • oxygen vacancy
  • reactive oxygen species

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