2013
DOI: 10.1021/nn3059983
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Magnetite Biomineralization in Magnetospirillum gryphiswaldense: Time-Resolved Magnetic and Structural Studies

Abstract: Magnetotactic bacteria biosynthesize magnetite nanoparticles of high structural and chemical purity that allow them to orientate in the geomagnetic field. In this work we have followed the process of biomineralization of these magnetite nanoparticles. We have performed a time-resolved study on magnetotactic bacteria Magnetospirillum gryphiswaldense strain MSR-1. From the combination of magnetic and structural studies by means of Fe K-edge X-ray absorption near edge structure (XANES) and high-resolution transmi… Show more

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Cited by 115 publications
(130 citation statements)
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“…In contrast, excision of mamI in M. gryphiswaldense did not entirely abolish the biomineralization of electron-dense iron-rich particles, but the mutant still synthesized tiny and poorly crystalline nonmagnetic particles, which in some cases were shown to consist of hematite. Recent findings for M. gryphiswaldense and M. magneticum indicate that the observed poorly ordered iron (oxyhydr)oxide phases are precursors to the magnetite phase in bacteria (41,52). In addition, the ability of MamP to precipitate ferrihydrite and magnetite in vitro suggests that magnetite may be formed through a stepwise phase transformation process (48).…”
Section: Discussionmentioning
confidence: 99%
“…In contrast, excision of mamI in M. gryphiswaldense did not entirely abolish the biomineralization of electron-dense iron-rich particles, but the mutant still synthesized tiny and poorly crystalline nonmagnetic particles, which in some cases were shown to consist of hematite. Recent findings for M. gryphiswaldense and M. magneticum indicate that the observed poorly ordered iron (oxyhydr)oxide phases are precursors to the magnetite phase in bacteria (41,52). In addition, the ability of MamP to precipitate ferrihydrite and magnetite in vitro suggests that magnetite may be formed through a stepwise phase transformation process (48).…”
Section: Discussionmentioning
confidence: 99%
“…On the basis of X-ray circular magnetic dichroism, hematite (α-Fe 2 O 3 ) was found as a precursor to magnetite in the same bacterial strain and was suggested to represent an outer layer around the nascent magnetite phase from which it grew (21). Very recently, the involvement of bacterioferritin in the mineralization pathway was again suggested in this strain (22). Thus, it remained to be determined which of the differently proposed precursor materials is involved in the mineralization of magnetite or how the different findings can be reconciled, how the precursors are spatially distributed within the bacterial cell, and how the phase transformation proceeds from precursor to final mineral.…”
mentioning
confidence: 82%
“…12,13 Although magnetotactic bacteria were discovered almost four decades ago, little is known about the mechanisms by which bacteria synthesize these magnetic crystals. 9,11,14 Recently, with the discovery and isolation of new bacterial strains and the development of new techniques, there has been progress in understanding magnetosome formation. 9,15,16 Inspired by nature, the chemical synthesis of hybrid materials with unusual morphologies at several length scales has received considerable interest from the research community.…”
Section: ■ Introductionmentioning
confidence: 99%