magnetotactic bacterium
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2021 ◽  
Vol 3 (3) ◽  
Author(s):  
Thomas Feggeler ◽  
Ralf Meckenstock ◽  
Detlef Spoddig ◽  
Benjamin W. Zingsem ◽  
Hendrik Ohldag ◽  
...  


2021 ◽  
Vol 39 (6) ◽  
pp. 2097-2106
Author(s):  
Haijian Du ◽  
Wenyan Zhang ◽  
Wei Lin ◽  
Hongmiao Pan ◽  
Tian Xiao ◽  
...  


PLoS ONE ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. e0248313
Author(s):  
Hirokazu Shimoshige ◽  
Hideki Kobayashi ◽  
Shigeru Shimamura ◽  
Toru Mizuki ◽  
Akira Inoue ◽  
...  

Magnetotactic bacteria (MTB) synthesize magnetosomes composed of membrane-enveloped magnetite (Fe3O4) and/or greigite (Fe3S4) nanoparticles in the cells. It is known that the magnetotactic Deltaproteobacteria are ubiquitous and inhabit worldwide in the sediments of freshwater and marine environments. Mostly known MTB belonging to the Deltaproteobacteria are dissimilatory sulfate-reducing bacteria that biomineralize bullet-shaped magnetite nanoparticles, but only a few axenic cultures have been obtained so far. Here, we report the isolation, cultivation and characterization of a dissimilatory sulfate-reducing magnetotactic bacterium, which we designate “strain FSS-1”. We found that the strain FSS-1 is a strict anaerobe and uses casamino acids as electron donors and sulfate as an electron acceptor to reduce sulfate to hydrogen sulfide. The strain FSS-1 produced bullet-shaped magnetite nanoparticles in the cells and responded to external magnetic fields. On the basis of 16S rRNA gene sequence analysis, the strain FSS-1 is a member of the genus Desulfovibrio, showing a 96.7% sequence similarity to Desulfovibrio putealis strain B7-43T. Futhermore, the magnetosome gene cluster of strain FSS-1 was different from that of Desulfovibrio magneticus strain RS-1. Thus, the strain FSS-1 is considered to be a novel sulfate-reducing magnetotactic bacterium belonging to the genus Desulfovibrio.



Nanoscale ◽  
2021 ◽  
Author(s):  
Anna Pohl ◽  
Sarah A. E. Young ◽  
Tara C. Schmitz ◽  
Daniel Farhadi ◽  
Raz Zarivach ◽  
...  

Magnetite-binding proteins are in high demand for the functionalization of magnetic nanoparticles. Binding analysis of six previously uncharacterized proteins from the magnetotactic Deltaproteobacterium Desulfamplus magnetovallimortis BW-1 identified two new magnetite-binding...



2020 ◽  
Vol 15 (12) ◽  
pp. 2000278 ◽  
Author(s):  
Atsushi Arakaki ◽  
Mayu Goto ◽  
Mina Maruyama ◽  
Takuto Yoda ◽  
Masayoshi Tanaka ◽  
...  


2020 ◽  
Vol 15 (1) ◽  
pp. 1-18
Author(s):  
Caroline L. Monteil ◽  
Karim Benzerara ◽  
Nicolas Menguy ◽  
Cécile C. Bidaud ◽  
Emmanuel Michot-Achdjian ◽  
...  


2020 ◽  
Vol 500 ◽  
pp. 166346 ◽  
Author(s):  
D. de Cos ◽  
N. Lete ◽  
M.L. Fdez-Gubieda ◽  
A. García-Arribas


2019 ◽  
Vol 366 (22) ◽  
Author(s):  
Hongmiao Pan ◽  
Yi Dong ◽  
Zhaojie Teng ◽  
Jinhua Li ◽  
Wenyan Zhang ◽  
...  

ABSTRACT Magnetotactic bacteria (MTB) are a group of microorganisms that have the ability to synthesize intracellular magnetic crystals (magnetosomes). They prefer microaerobic or anaerobic aquatic sediments. Thus, there is growing interest in their ecological roles in various habitats. In this study we found co-occurrence of a large rod-shaped deltaproteobacterial magnetotactic bacterium (tentatively named LR-1) in the sediment of a brackish lagoon with algal bloom. Electron microscopy observations showed that they were ovoid to slightly curved rods having a mean length of 6.3 ± 1.1 μm and a mean width of 4.1 ± 0.4 μm. Each cell had a single polar flagellum. They contained hundreds of bullet-shaped intracellular magnetite magnetosomes. Phylogenetic analysis revealed that they were most closely related to Desulfamplus magnetovallimortis strain BW-1, and belonged to the Deltaproteobacteria. Our findings indicate that LR-1 may be a new species of MTB. We propose that deltaproteobacterial MTB may play an important role in iron cycling and so may represent a reservoir of iron, and be an indicator species for monitoring algal blooms in such eutrophic ecosystems. These observations provide new clues to the cultivation of magnetotactic Deltaproteobacteria and the control of algal blooms, although further studies are needed.



2019 ◽  
Vol 112 (5) ◽  
pp. 1423-1439 ◽  
Author(s):  
Mauricio Toro‐Nahuelpan ◽  
Laura Corrales‐Guerrero ◽  
Theresa Zwiener ◽  
Manuel Osorio‐Valeriano ◽  
Frank‐Dietrich Müller ◽  
...  


2019 ◽  
Vol 69 (7) ◽  
pp. 1953-1959 ◽  
Author(s):  
Veronika V. Koziaeva ◽  
Svetlana A. Rusakova ◽  
Natalia V. Slobodova ◽  
Maria Uzun ◽  
Tatiana V. Kolganova ◽  
...  


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