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Magnetic-field induced rotation of magnetosome chains in silicified magnetotactic bacteria.


ABSTRACT: Understanding the biological processes enabling magnetotactic bacteria to maintain oriented chains of magnetic iron-bearing nanoparticles called magnetosomes is a major challenge. The study aimed to constrain the role of an external applied magnetic field on the alignment of magnetosome chains in Magnetospirillum magneticum AMB-1 magnetotactic bacteria immobilized within a hydrated silica matrix. A deviation of the chain orientation was evidenced, without significant impact on cell viability, which was preserved after the field was turned-off. Transmission electron microscopy showed that the crystallographic orientation of the nanoparticles within the chains were preserved. Off-axis electron holography evidenced that the change in magnetosome orientation was accompanied by a shift from parallel to anti-parallel interactions between individual nanocrystals. The field-induced destructuration of the chain occurs according to two possible mechanisms: (i) each magnetosome responds individually and reorients in the magnetic field direction and/or (ii) short magnetosome chains deviate in the magnetic field direction. This work enlightens the strong dynamic character of the magnetosome assembly and widens the potentialities of magnetotactic bacteria in bionanotechnology.

SUBMITTER: Blondeau M 

PROVIDER: S-EPMC5955880 | biostudies-other | 2018 May

REPOSITORIES: biostudies-other

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Magnetic-field induced rotation of magnetosome chains in silicified magnetotactic bacteria.

Blondeau Marine M   Guyodo Yohan Y   Guyot François F   Gatel Christophe C   Menguy Nicolas N   Chebbi Imène I   Haye Bernard B   Durand-Dubief Mickaël M   Alphandery Edouard E   Brayner Roberta R   Coradin Thibaud T  

Scientific reports 20180516 1


Understanding the biological processes enabling magnetotactic bacteria to maintain oriented chains of magnetic iron-bearing nanoparticles called magnetosomes is a major challenge. The study aimed to constrain the role of an external applied magnetic field on the alignment of magnetosome chains in Magnetospirillum magneticum AMB-1 magnetotactic bacteria immobilized within a hydrated silica matrix. A deviation of the chain orientation was evidenced, without significant impact on cell viability, wh  ...[more]