Controlled Biomineralization of Magnetite in Bacteria

Descamps, Elodie; Abbé, Jean‐Baptiste; Pignol, David; Lefèvre, Christopher T.

doi:10.1002/9783527691395.ch5

Cited by 5 publications

(2 citation statements)

References 113 publications

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“…S14 and S15 present additional HR-TEM analyses of individual particles and demonstrate the consistent <111> alignment with chain direction and further this unexpected nanocrystal shape for magnetite. This crystallographic form of magnetite from a magnetosome-producing bacterium of the Deltaproteobacteria class is unanticipated, which suggests previous studies that correlated the nanocrystal morphology formed by a bacterium and its phylogenetic position should be reconsidered ( 41 , 43 , 44 ).…”

Section: Resultsmentioning

confidence: 93%

Collective magnetotaxis of microbial holobionts is optimized by the three-dimensional organization and magnetic properties of ectosymbionts

Chevrier

Juhin

Menguy

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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Over the last few decades, symbiosis and the concept of holobiont—a host entity with a population of symbionts—have gained a central role in our understanding of life functioning and diversification. Regardless of the type of partner interactions, understanding how the biophysical properties of each individual symbiont and their assembly may generate collective behaviors at the holobiont scale remains a fundamental challenge. This is particularly intriguing in the case of the newly discovered magnetotactic holobionts (MHB) whose motility relies on a collective magnetotaxis (i.e., a magnetic field-assisted motility guided by a chemoaerotaxis system). This complex behavior raises many questions regarding how magnetic properties of symbionts determine holobiont magnetism and motility. Here, a suite of light-, electron- and X-ray-based microscopy techniques [including X-ray magnetic circular dichroism (XMCD)] reveals that symbionts optimize the motility, the ultrastructure, and the magnetic properties of MHBs from the microscale to the nanoscale. In the case of these magnetic symbionts, the magnetic moment transferred to the host cell is in excess (10 2 to 10 3 times stronger than free-living magnetotactic bacteria), well above the threshold for the host cell to gain a magnetotactic advantage. The surface organization of symbionts is explicitly presented herein, depicting bacterial membrane structures that ensure longitudinal alignment of cells. Magnetic dipole and nanocrystalline orientations of magnetosomes were also shown to be consistently oriented in the longitudinal direction, maximizing the magnetic moment of each symbiont. With an excessive magnetic moment given to the host cell, the benefit provided by magnetosome biomineralization beyond magnetotaxis can be questioned.

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Section: Resultsmentioning

confidence: 93%

Collective magnetotaxis of microbial holobionts is optimized by the three-dimensional organization and magnetic properties of ectosymbionts

Chevrier

Juhin

Menguy

et al. 2023

Proc. Natl. Acad. Sci. U.S.A.

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“…In particular, the magnetite series forms in supergenic environments, as a pseudomorphic replacement after cassiterite, siderite, and sulfides, as well as in skarn (King, 2004). Finally, magnetite can also be produced by biologically induced mineralization (BIM) (Descamps et al, 2016). It represents a mineralogical species similar to amphiboles that crystallizes in a variety of environments and with which spinels can associate, whose crystallochemical flexibility can record the chemical and physical conditions of the formation environment and give important genetic information (e.g., water activity, oxygen fugacity; Comodi et al 2010).…”

mentioning

confidence: 99%

Trace and ultratrace elements in spinel subgroup minerals of ultramafic rocks from the Voltri Massif (NW Italy): the influence of microstructure and texture

Fornasaro,

Comodi,

Crispini

et al. 2023

Eur. J. Mineral.

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Abstract. An innovative multi-analytical approach comprising mineralogical, minero-chemical, and microstructural analyses as well as an indirect machine learning-based statistical method was applied to investigate the mineralogy and the mineral chemistry of spinel subgroup minerals (SSMs) of different ultramafic rocks from the high-pressure metaophiolites of the Voltri Massif (Central Liguria, NW Italy). The study was focused on the correlation between the compositional variations of SSMs and their texture, microstructure, and the degree of serpentinization of the host rock. The SSM occurs with three main textures and microstructures linked to the progressive serpentinization and deformation of ultramafic rocks during the Alpine orogenic events: (i) Cr-spinel porphyroclasts with various degrees of recrystallization (up to magnetite porphyroblasts) within partially serpentinized peridotite and massive serpentinite; (ii) magnetite crystals associated with pseudomorphic and non-pseudomorphic serpentine textures (e.g., mesh, hourglass, ribbon, and interpenetrating textures) in partially serpentinized peridotite and massive serpentinites; and (iii) magnetite crystals re-oriented along the foliations developed in serpentine schist. The chemical composition of SSMs varies systematically within the textures and microstructures. These processes also affected the chemical composition of SSMs, the availability of Mn, Zn, Ni, and Co in solution, and their consequent incorporation in the lattice of chromian spinel due to olivine breakdown, the major repository of these elements in ultramafic rocks. At a general scale, the trace and ultratrace variability is primarily related to the petrologic and tectonic evolution but, at a local scale, also the mineralogical, lithological, structural, and textural features correlated to the degree of serpentinization and/or deformation. These significantly influence the distribution and concentration of trace and ultratrace elements in SSMs. The results of the present work were also confirmed by an innovative indirect statistical method performed through the Weka Machine Learning Workbench.

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Biological synthesis of metallic nanoparticles (MNPs) by plants and microbes: their cellular uptake, biocompatibility, and biomedical applications

Ahmad

Ashraf

et al. 2019

Appl Microbiol Biotechnol

114

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Controlled Biomineralization of Magnetite in Bacteria

Cited by 5 publications

References 113 publications

Collective magnetotaxis of microbial holobionts is optimized by the three-dimensional organization and magnetic properties of ectosymbionts

Collective magnetotaxis of microbial holobionts is optimized by the three-dimensional organization and magnetic properties of ectosymbionts

Trace and ultratrace elements in spinel subgroup minerals of ultramafic rocks from the Voltri Massif (NW Italy): the influence of microstructure and texture

Biological synthesis of metallic nanoparticles (MNPs) by plants and microbes: their cellular uptake, biocompatibility, and biomedical applications

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