Details

Autor(en) / Beteiligte

• Orue, I
• Marcano, L
• Bender, P
• García-Prieto, A
• Valencia, S
• Mawass, M. A
• Gil-Cartón, D
• Alba Venero, D
• Honecker, D
• García-Arribas, A
• Fernández Barquín, L
• Muela, A
• Fdez-Gubieda, M. L

Titel

Configuration of the magnetosome chain: a natural magnetic nanoarchitectureElectronic supplementary information (ESI) available: TEM image of oriented bacteria, details on the calculation of the hysteresis loops, calculation of the chain energy, and 2D projection of the magnetic dipoles. Movies S1 and S2: Videos of the tomograms of the three chains in Fig. 1a and b viewed as consecutive slices in XY, YZ, and YZ plane orientations, and as an electron density map. Movie S3: Video of the experiment

Erscheinungsjahr

2018-04

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Magnetospirillum gryphiswaldense is a microorganism with the ability to biomineralize magnetite nanoparticles, called magnetosomes, and arrange them into a chain that behaves like a magnetic compass. Rather than straight lines, magnetosome chains are slightly bent, as evidenced by electron cryotomography. Our experimental and theoretical results suggest that due to the competition between the magnetocrystalline and shape anisotropies, the effective magnetic moment of individual magnetosomes is tilted out of the [111] crystallographic easy axis of magnetite. This tilt does not affect the direction of the chain net magnetic moment, which remains along the [111] axis, but explains the arrangement of magnetosomes in helical-like shaped chains. Indeed, we demonstrate that the chain shape can be reproduced by considering an interplay between the magnetic dipolar interactions between magnetosomes, ruled by the orientation of the magnetosome magnetic moment, and a lipid/protein-based mechanism, modeled as an elastic recovery force exerted on the magnetosomes. Magnetospirillum gryphiswaldense is a microorganism with the ability to biomineralize magnetite nanoparticles, called magnetosomes, and arrange them into a chain that behaves like a magnetic compass.