Biomineralization of Iron Sulfides in Magnetotactic Bacteria from Sulfidic Environments

Bazylinski, Dennis A.; Frankel, Richard B.; Garratt‐Reed, Anthony J.; Mann, Stephen

doi:10.1007/978-1-4615-3810-3_17

Cited by 33 publications

(51 citation statements)

References 42 publications

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“…Cells are asymmetrically flagellated, with the surface of the cell exposed to the surrounding environment and covered with numerous flagella (125,128). Most described MMPs are spherical (42,45,(124)(125)(126)129), although some are ovoid or pineapple shaped in morphology (121,130), and they all appear to possess a central, acellular compartment (124,129,131). Wall structures between cells similar to eukaryotic gap junctions have been described for one MMP (125).…”

Section: Deltaproteobacteriamentioning

confidence: 99%

“…MMPs are relatively large for prokaryotic microorganisms and range from about 3 to 12 m in diameter (125,126) (Fig. 7E).…”

Section: Deltaproteobacteriamentioning

confidence: 99%

“…7E). They are best described as an aggregation of about 10 to 60 Gramnegative, genetically similar cells that swim only as an intact unit and not as individual cells (44,(124)(125)(126). Cells that become separated from the intact unit die quickly (127).…”

Section: Deltaproteobacteriamentioning

confidence: 99%

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Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Lefèvre

Bazylinski

2013

Microbiol Mol Biol Rev

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366

388

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SUMMARY Magnetotactic bacteria (MTB) are widespread, motile, diverse prokaryotes that biomineralize a unique organelle called the magnetosome. Magnetosomes consist of a nano-sized crystal of a magnetic iron mineral that is enveloped by a lipid bilayer membrane. In cells of almost all MTB, magnetosomes are organized as a well-ordered chain. The magnetosome chain causes the cell to behave like a motile, miniature compass needle where the cell aligns and swims parallel to magnetic field lines. MTB are found in almost all types of aquatic environments, where they can account for an important part of the bacterial biomass. The genes responsible for magnetosome biomineralization are organized as clusters in the genomes of MTB, in some as a magnetosome genomic island. The functions of a number of magnetosome genes and their associated proteins in magnetosome synthesis and construction of the magnetosome chain have now been elucidated. The origin of magnetotaxis appears to be monophyletic; that is, it developed in a common ancestor to all MTB, although horizontal gene transfer of magnetosome genes also appears to play a role in their distribution. The purpose of this review, based on recent progress in this field, is focused on the diversity and the ecology of the MTB and also the evolution and transfer of the molecular determinants involved in magnetosome formation.

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Section: Deltaproteobacteriamentioning

confidence: 99%

“…MMPs are relatively large for prokaryotic microorganisms and range from about 3 to 12 m in diameter (125,126) (Fig. 7E).…”

Section: Deltaproteobacteriamentioning

confidence: 99%

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Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Lefèvre

Bazylinski

2013

Microbiol Mol Biol Rev

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366

388

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“…Studies on organisms from sulphidic environments, however, have shown that some species have magnetosomes containing iron sulphides such as greigite, pyrrhotite and pyrite (Farina et al, 1990;Mann et al, 1990;Bazylinski et al, 1990. In addition, these iron sulphide containing magnetosomes may be more amenable to replacement by other cations.…”

Section: Morphology and Composition Of Magnetosomesmentioning

confidence: 99%

“…1). Unicellular coccoids of varying diameters (Blakemore, 1975 ;Moench & Konetzka, 1978 ; Esquivel & Lins de Barros, 1986;Chang et al, 1987), multicellular coccoids (MMP; Lins de Barros & Esquivel, 1985;Farina et al, 1990;Mann et al, 1990), rods of varying dimensions (Blakemore et al, 1980;Bazylinski et al, 1990;von Dobeneck et al, 1987;Stolz, 1992), vibrios (Bazylinski et al, 1988;Stolz, 1992) and spirilla (Blakemore et al, 1979;Spormann & Wolfe, 1984;Matsunaga et al, 1991 ;Schliefer et al, 1991 ;Spring et al, 1992) have been reported from numerous locations around the world. Regardless of morphology, the organisms all contain magnetosomes and are propelled by flagella.…”

Section: Morphology and Composition Of Magnetosomesmentioning

confidence: 99%

Magnetosomes

Stolz¹

1993

Journal of General Microbiology

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Cyclic magnetite dissolution in Pleistocene sediments of the abyssal northwest Pacific Ocean: Evidence for glacial oxygen depletion and carbon trapping

et al. 2016

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The carbonate-free abyss of the North Pacific defies most paleoceanographic proxy methods and hence remains a "blank spot" in ocean and climate history. Paleomagnetic and rock magnetic, geochemical, and sedimentological methods were combined to date and analyze seven middle to late Pleistocene northwest Pacific sediment cores from water depths of 5100 to 5700 m. Besides largely coherent tephra layers, the most striking features of these records are nearly magnetite-free zones corresponding to glacial marine isotope stages (MISs) 22, 12, 10, 8, 6, and 2. Magnetite depletion is correlated with organic carbon and quartz content and anticorrelated with biogenic barite and opal content. Within interglacial sections and mid-Pleistocene transition glacial stages MIS 20, 18, 16, and 14, magnetite fractions of detrital, volcanic, and bacterial origin are all well preserved. Such alternating successions of magnetic iron mineral preservation and depletion are known from sapropel-marl cycles, which accumulated under periodically changing bottom water oxygen and redox conditions. In the open central northwest Pacific Ocean, the only conceivable mechanism to cause such abrupt change is a modified glacial bottom water circulation. During all major glaciations since MIS 12, oxygen-depleted Antarctic Bottom Water (AABW)-sourced bottom water seems to have crept into the abyssal northwest Pacific below~5000 m depth, thereby changing redox conditions in the sediment, trapping and preserving dissolved and particulate organic matter and, in consequence, reducing and dissolving both, biogenic and detrital magnetite. At deglaciation, a downward progressing oxidation front apparently remineralized and released these sedimentary carbon reservoirs without replenishing the magnetite losses.

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Biomineralization of Iron Sulfides in Magnetotactic Bacteria from Sulfidic Environments

Cited by 33 publications

References 42 publications

Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Ecology, Diversity, and Evolution of Magnetotactic Bacteria

Magnetosomes

Cyclic magnetite dissolution in Pleistocene sediments of the abyssal northwest Pacific Ocean: Evidence for glacial oxygen depletion and carbon trapping

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