Insight into the structure and metabolic function of iron-rich nanoparticles in anammox bacteria
Anaerobic ammonium-oxidizing (anammox) bacteria are iron abundant and depend heavily on iron-binding proteins. The iron demand of anammox bacteria is relatively large. However, it still remains some doubts where these large quantities of available iron come from and how they are regulated in anammox...
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Veröffentlicht in: | The Science of the total environment 2022-02, Vol.806 (Pt 4), p.150879-150879, Article 150879 |
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Sprache: | eng |
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Zusammenfassung: | Anaerobic ammonium-oxidizing (anammox) bacteria are iron abundant and depend heavily on iron-binding proteins. The iron demand of anammox bacteria is relatively large. However, it still remains some doubts where these large quantities of available iron come from and how they are regulated in anammox bacteria. Herein, iron-rich nanoparticles in anammoxosomes were detected by synchrotron soft X-ray tomography coupled with scanning transmission X-ray microscopy (STXM). The iron-rich nanoparticles were identified as ferric oxide (α-Fe2O3) mineral cores, and the local atomic structure of iron-rich nanoparticles was obtained by X-ray absorption fine-structure (XAFS) spectra. The bacterioferritin of Q1Q315 and Q1Q5F8 were detected by proteomics analysis. On this basis, the metabolic pathway centered on iron-rich nanoparticles was proposed.
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•Iron-rich nanoparticles in anammoxosomes were determined by STXM imaging.•Iron-rich nanoparticles were identified as ferric oxide (α-Fe2O3) by XAFS.•Iron-rich nanoparticles were referred to be bacterioferritin.•The metabolic pathway of iron-rich nanoparticles was proposed. |
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ISSN: | 0048-9697 1879-1026 |
DOI: | 10.1016/j.scitotenv.2021.150879 |