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Applied Microbiology and Biotechnology

, Volume 101, Issue 7, pp 2953–2965 | Cite as

Regulation of membrane fixation and energy production/conversion for adaptation and recovery of ZnO nanoparticle impacted Nitrosomonas europaea

  • Junkang Wu
  • Huijie Lu
  • Guangcan Zhu
  • Lianghui Chen
  • Yan Chang
  • Ran Yu
Applied genetics and molecular biotechnology

Abstract

The ZnO nanoparticle (NP) effects on typical ammonia-oxidizing bacteria, Nitrosomonas europaea in a chemostat bioreactor, and the cells’ toxicity adaptation and recovery potentials were explored. Hardly any inhibition was observed when the NP concentration was high up to 10 mg/L. The cells exposed to 50 mg/L ZnO NPs displayed time-dependent impairment and recovery potentials in terms of cell density, membrane integrity, nitrite production rate, and ammonia monooxygenase activity. The 6-h NP stress impaired cells were nearly completely restored during a 12-h recovery incubation, while the longer exposure time would cause irretrievable cell damage. Microarray analysis further indicated the transcriptional adaptation of N. europaea to NP stress. The regulations of genes encoding for membrane permeability or osmoprotectant, membrane integrity preservation, and inorganic ion transport during NP exposure and cell recovery revealed the importance of membrane fixation and the associated metabolisms for cells’ self-protection and the following recovery from NP stress. The oxidative phosphorylation, carbon assimilation, and tricarboxylic acid (TCA) cycling pathways involved in the cells’ antitoxicity activities and would promote the energy production/conversion efficiency for cell recovery. The heavy metal resistance, histidine metabolism, toxin-antitoxin defense, glycolysis, and sulfate reduction pathways were also suggested to participate in the cell detoxication and recovery processes. All these findings provided valuable insights into the mechanisms of cell-mediated ZnO NP cytotoxicity and their potential impacts on wastewater nitrogen removal system.

Keywords

ZnO nanoparticle Nitrosomonas europaea Microarray Inhibition Recovery 

Notes

Acknowledgements

This study was supported by National Natural Science Foundation of China (No. 51678134 and No. 51208092), Natural Science Foundation of Jiangsu Province of China (BK2012124), and Doctoral Fund of Ministry of Education of China (20120092120010). We sincerely appreciate Professor Chang-ping Yu at Institute of Urban Environment at Chinese Academy of Science for his kind offer of N. europaea cultures.

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

253_2017_8092_MOESM1_ESM.pdf (608 kb)
ESM 1 (PDF 607 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Junkang Wu
    • 1
    • 2
  • Huijie Lu
    • 3
  • Guangcan Zhu
    • 1
    • 2
  • Lianghui Chen
    • 1
    • 2
  • Yan Chang
    • 1
    • 2
  • Ran Yu
    • 1
    • 2
  1. 1.Department of Environmental Science and Engineering, School of Energy and Environment, Wuxi Engineering Research Center of Taihu Lake Water EnvironmentSoutheast UniversityNanjingChina
  2. 2.Key Laboratory of Environmental Medicine Engineering, Ministry of EducationSoutheast UniversityNanjingChina
  3. 3.College of Environmental and Resource SciencesZhejiang UniversityHangzhouChina

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