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Development of Cellular Magnetic Dipoles in Magnetotactic Bacteria

By Damien Faivre, Anna Fischer, Inés Garcia-Rubio, Giovanni Mastrogiacomo and Andreas U. Gehring

Abstract

Magnetotactic bacteria benefit from their ability to form cellular magnetic dipoles by assembling stable single-domain ferromagnetic particles in chains as a means to navigate along Earth's magnetic field lines on their way to favorable habitats. We studied the assembly of nanosized membrane-encapsulated magnetite particles (magnetosomes) by ferromagnetic resonance spectroscopy using Magnetospirillum gryphiswaldense cultured in a time-resolved experimental setting. The spectroscopic data show that 1), magnetic particle growth is not synchronized; 2), the increase in particle numbers is insufficient to build up cellular magnetic dipoles; and 3), dipoles of assembled magnetosome blocks occur when the first magnetite particles reach a stable single-domain state. These stable single-domain particles can act as magnetic docks to stabilize the remaining and/or newly nucleated superparamagnetic particles in their adjacencies. We postulate that docking is a key mechanism for building the functional cellular magnetic dipole, which in turn is required for magnetotaxis in bacteria

Topics: Spectroscopy, Imaging, and Other Techniques
Publisher: The Biophysical Society
OAI identifier: oai:pubmedcentral.nih.gov:2920646
Provided by: PubMed Central
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