期刊
WATER RESEARCH
卷 223, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2022.118993
关键词
Polystyrene nanoparticle; Methanogenic archaea; Surface group; Extracellular polymer substances; Molecular response
资金
- National Science Foundation of China [U1906224]
- Shandong Provincial Natural Science Foundation [ZR2019JQ18]
- Shandong Postdoctoral Innovation Talent Support Pro- gram [SDBX2020008]
- China Postdoctoral Science Foundation [2020M682227]
- Youth Interdisciplinary Science and Innovative Research Groups of Shandong University [2020QNQT014]
- Qilu Youth Talent Program of Shandong University
A better understanding of the interaction between nanoplastics and methanogenic archaea is crucial for assessing the ecological safety of nanoplastics. This study found that functionalized polystyrene nanoparticles can affect the DNA-mediated transposition and metabolic processes of Methanosarcina acetivorans C2A. The surface groups of the nanoparticles control their risk on the archaea and may affect global methane emissions.
A better understanding of the interaction between nanoplastics and archaea is crucial to fill the knowledge gaps regarding the ecological safety of nanoplastics. As a vital source for global methane emissions, methanogenic archaea have unique cell membranes that are distinctly different from those in all other forms of life, little is known about their interaction with nanoplastics. Here, we show that polystyrene nanoparticles functionalized with sulfonic acid (PS-SO3H) and amino (PS-NH2) interact with this methanogenic archaeon in distinct ways. Although both of them have no significant phenotype effects on Methanosarcina acetivorans C2A, these nanoparticles could affect DNA-mediated transposition of this methanogenic archaeon, and PS-SO3H also downregulated nitrogen fixation, nitrogen cycle metabolic process, oxidoreductase activity, etc. In addition, both nanoplastics decreased the protein contents in the extracellular polymer substances (EPS), with distinct binding sequences to the functional groups of the EPS. The single particle atomic force microscopy revealed that the force between the amino group and the M. acetivorans C2A was greater than that of sulfonic acid group. Our results exhibit that the surface groups of polystyrene nanoparticles control their risk on the methanogenic archaea, and these effects might influence their contribution on global methane emission.
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