期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 838, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2022.156176
关键词
Extracellular polymeric substance; Extracellular electron transfer; Low concentration; Tetracycline; Transcriptomic analysis
资金
- Natural Science Foundation of China [51878309, 52070083]
- Natural Science Foundation of Hubei Province [2020CFA042]
- Applied Basic Research Program of Wuhan [2020020601012277]
- Open Fund of Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling [2020B121201003]
- Program for HUST Academic Frontier Youth Team
This study reveals how low concentrations of tetracycline can modulate the extracellular polymeric substances, leading to enhanced extracellular electron transfer efficiency in Geobacter sulfurreducens biofilms.
Low concentrations of antibiotics can regulate the formation of electroactive biofilms, however, the underlying mechanisms, especially the composition and spatial distribution of extracellular polymeric substances (EPS) and their effects on extracellular electron transfer (EET) process, have not been fully deciphered. Here, the response of EPS of Geobacter sulfurreducens biofilm to low concentrations of tetracycline (mu g L-1 to mg L-1) was explored, and the impact of such EPS variations on EET efficiency was further elucidated by transcriptomic analysis. Results showed that 0.05 mgL(-1) of tetracycline achieved both beneficial quantitative and spatial regulation of redox-active proteins and non-conducting exopolysaccharides in EPS, while higher concentrations induced negative effects. Moreover, 1 mg L-1 of tetracycline upregulated multiple exopolysaccharide biosynthesis-related genes, indicating a stress response for cell-protection, while 0.05 mg L-1 of tetracycline upregulated most direct EET-related gene expressions, resulting in the promoted EET efficiency. Furthermore, 0.05 mg L-1 of tetracycline selectively enriched Geobacter (45.55% vs 19.55% in control, respectively) from mixed inoculum. This research provides a new insight of how antibiotics at low concentrations regulated EET process through modulation of EPS.
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