Bullet‐Shaped Magnetite Biomineralization Within a Magnetotactic Deltaproteobacterium: Implications for Magnetofossil Identification

2020 ◽  
Vol 125 (7) ◽  
Author(s):  
Jinhua Li ◽  
Nicolas Menguy ◽  
Andrew P. Roberts ◽  
Lin Gu ◽  
Eric Leroy ◽  
...  
Keyword(s):  
Magnetite Biomineralization

Magnetite Biomineralization in Bacteria

2011 ◽  
pp. 3-27 ◽  
Author(s):  
Jens Baumgartner ◽  
Damien Faivre
Keyword(s):  
Magnetite Biomineralization

scholarly journals A Compass To Boost Navigation: Cell Biology of Bacterial Magnetotaxis

2020 ◽  
Vol 202 (21) ◽  
Author(s):  
Frank D. Müller ◽  
Dirk Schüler ◽  
Daniel Pfeiffer
Keyword(s):  
Magnetic Field ◽  
Cell Biology ◽  
Molecular Mechanisms ◽  
Magnetotactic Bacteria ◽  
Genetically Engineered ◽  
Model Organisms ◽  
Complex Cell ◽  
Magnetite Biomineralization ◽  
Directed Motility ◽  
The Impact

ABSTRACT Magnetotactic bacteria are aquatic or sediment-dwelling microorganisms able to take advantage of the Earth’s magnetic field for directed motility. The source of this amazing trait is magnetosomes, unique organelles used to synthesize single nanometer-sized crystals of magnetic iron minerals that are queued up to build an intracellular compass. Most of these microorganisms cannot be cultivated under controlled conditions, much less genetically engineered, with only few exceptions. However, two of the genetically amenable Magnetospirillum species have emerged as tractable model organisms to study magnetosome formation and magnetotaxis. Recently, much has been revealed about the process of magnetosome biogenesis and dedicated structures for magnetosome dynamics and positioning, which suggest an unexpected cellular intricacy of these organisms. In this minireview, we summarize new insights and place the molecular mechanisms of magnetosome formation in the context of the complex cell biology of Magnetospirillum spp. First, we provide an overview on magnetosome vesicle synthesis and magnetite biomineralization, followed by a discussion of the perceptions of dynamic organelle positioning and its biological implications, which highlight that magnetotactic bacteria have evolved sophisticated mechanisms to construct, incorporate, and inherit a unique navigational device. Finally, we discuss the impact of magnetotaxis on motility and its interconnection with chemotaxis, showing that magnetotactic bacteria are outstandingly adapted to lifestyle and habitat.

Iron uptake and magnetite biomineralization in the magnetotactic bacterium Magnetospirillum magneticum strain AMB-1: An iron isotope study

2018 ◽  
Vol 232 ◽  
pp. 225-243 ◽  
Author(s):  
Matthieu Amor ◽  
Vincent Busigny ◽  
Pascale Louvat ◽  
Mickaël Tharaud ◽  
Alexandre Gélabert ◽  
...  
Keyword(s):  
Iron Uptake ◽  
Magnetotactic Bacterium ◽  
Iron Isotope ◽  
Isotope Study ◽  
Magnetite Biomineralization ◽  
Magnetospirillum Magneticum

scholarly journals Magnetite biomineralization in ferruginous waters and early Earth evolution

2020 ◽  
Vol 549 ◽  
pp. 116495 ◽  
Author(s):  
K.W. Bauer ◽  
J.M. Byrne ◽  
P. Kenward ◽  
R.L. Simister ◽  
C.C. Michiels ◽  
...  
Keyword(s):  
Early Earth ◽  
Magnetite Biomineralization

scholarly journals A Large Gene Cluster Encoding Several Magnetosome Proteins Is Conserved in Different Species of Magnetotactic Bacteria

2001 ◽  
Vol 67 (10) ◽  
pp. 4573-4582 ◽  
Author(s):  
Karen Grünberg ◽  
Cathrin Wawer ◽  
Bradley M. Tebo ◽  
Dirk Schüler
Keyword(s):  
Gene Cluster ◽  
Serine Proteases ◽  
Major Gene ◽  
Magnetotactic Bacteria ◽  
Large Gene ◽  
Specific Proteins ◽  
Magnetite Biomineralization ◽  
Cation Diffusion Facilitators ◽  
Tetratricopeptide Repeat Proteins ◽  
Genomic Regions

ABSTRACT In magnetotactic bacteria, a number of specific proteins are associated with the magnetosome membrane (MM) and may have a crucial role in magnetite biomineralization. We have cloned and sequenced the genes of several of these polypeptides in the magnetotactic bacterium Magnetospirillum gryphiswaldense that could be assigned to two different genomic regions. Except for mamA, none of these genes have been previously reported to be related to magnetosome formation. Homologous genes were found in the genome sequences ofM. magnetotacticum and magnetic coccus strain MC-1. The MM proteins identified display homology to tetratricopeptide repeat proteins (MamA), cation diffusion facilitators (MamB), and HtrA-like serine proteases (MamE) or bear no similarity to known proteins (MamC and MamD). A major gene cluster containing several magnetosome genes (including mamA and mamB) was found to be conserved in all three of the strains investigated. ThemamAB cluster also contains additional genes that have no known homologs in any nonmagnetic organism, suggesting a specific role in magnetosome formation.

scholarly journals Magnetite biomineralization and ancient life on Mars

2000 ◽  
Vol 4 (2) ◽  
pp. 171-176 ◽  
Author(s):  
R Frankel
Keyword(s):  
Life On Mars ◽  
Magnetite Biomineralization

scholarly journals Magnetite biomineralization in termites

1998 ◽  
Vol 265 (1397) ◽  
pp. 733-737 ◽  
Author(s):  
B.A. Maher
Keyword(s):  
Magnetite Biomineralization
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