131663 20240219150720.0 doi 10.1016/j.bpj.2010.05.034 sideral 90550 ART-2010-90550 eng Faivre, Damien Development of cellular magnetic dipoles in magnetotactic bacteria 2010 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. Access copy available to the general public Unrestricted info:eu-repo/semantics/openAccess All rights reserved http://www.europeana.eu/rights/rr-f/ 4.218 2010 BIOPHYSICS 18 / 72 = 0.25 2010 Q1 T1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Fischer, Anna Garcia Rubio, Ines (orcid)0000-0002-1827-1250 Mastrogiacomo, Giovanni Gehring, Andreas 99, 4 (2010), 1268-1273 Biophys. j. BIOPHYSICAL JOURNAL 0006-3495 1304180 http://zaguan.unizar.es/record/131663/files/texto_completo.pdf Versión publicada 3145003 http://zaguan.unizar.es/record/131663/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:131663 articulos driver 2024-02-19-13:22:42 ARTICLE