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<p>Bacteria capable of producing magnetic nanoparticles are valuable because of their potential for targeted navigation in applications such as drug delivery and remediation. Magnetotactic bacteria synthesize intracellular magnetosomes for navigation along Earth's magnetic field lines. In this study, we collected sediment samples from Hormuz Island&#xa0;for strain isolation. We used transmission electron microscopy (TEM) and X-ray diffraction (XRD) analyses to identify magnetosome morphology and composition. Moreover, resistance to UVC radiation and cobalt removal were assayed. A new strain belonging to the <i>Methylobacteriaceae</i> family, designated <i>Methylobacterium</i> sp. UTMC 4561 (available from CECT 30920), with 98.22% 16S rRNA similarity to <i>Methylobacterium radiotolerans</i>, exhibited high resistance to UVC radiation (showing only a 4-log reduction in viability at 300&#xa0;J/m<sup>2</sup>), and removed 18.61% of cobalt ions from water during the initial growth phase. TEM analysis revealed small, dark, cubo-octahedral crystals, and XRD patterns were compatible with those of biogenic magnetite (Fe<sub>3</sub>O<sub>4</sub>). Although genome sequence of this strain is not yet available to confirm the electron microscopy and chemotaxis observations, its ability to produce magnetic iron oxide nanoparticles even not in the form of magnetosome, tolerating heavy metals, and resistance to UV radiation and its oligotrophy suggests potential applications in treatment of sun-exposed polluted water. To the best of our knowledge, this is the first report on magnetosome like structures in <i>Methylobacterium</i>, thereby expanding the envisioned diversity of magnetic nanoparticle-producing bacteria.</p>

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Evidence of magnetic iron oxide biomineralization in a UV-C tolerant Methylobacterium sp. with cobalt-removal capability

  • 期刊论文

  • 发表日期：

    2026年7月14日

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  • F. Honarbakhsh,
  • F. Mohammadipanah

摘要

Bacteria capable of producing magnetic nanoparticles are valuable because of their potential for targeted navigation in applications such as drug delivery and remediation. Magnetotactic bacteria synthesize intracellular magnetosomes for navigation along Earth's magnetic field lines. In this study, we collected sediment samples from Hormuz Island for strain isolation. We used transmission electron microscopy (TEM) and X-ray diffraction (XRD) analyses to identify magnetosome morphology and composition. Moreover, resistance to UVC radiation and cobalt removal were assayed. A new strain belonging to the Methylobacteriaceae family, designated Methylobacterium sp. UTMC 4561 (available from CECT 30920), with 98.22% 16S rRNA similarity to Methylobacterium radiotolerans, exhibited high resistance to UVC radiation (showing only a 4-log reduction in viability at 300 J/m2), and removed 18.61% of cobalt ions from water during the initial growth phase. TEM analysis revealed small, dark, cubo-octahedral crystals, and XRD patterns were compatible with those of biogenic magnetite (Fe3O4). Although genome sequence of this strain is not yet available to confirm the electron microscopy and chemotaxis observations, its ability to produce magnetic iron oxide nanoparticles even not in the form of magnetosome, tolerating heavy metals, and resistance to UV radiation and its oligotrophy suggests potential applications in treatment of sun-exposed polluted water. To the best of our knowledge, this is the first report on magnetosome like structures in Methylobacterium, thereby expanding the envisioned diversity of magnetic nanoparticle-producing bacteria.