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Titel (primär) Schwertmannite formation at cell junctions by a new filament-forming Fe(II)-oxidizing isolate affiliated with the novel genus Acidithrix
Autor Mori, J.F.; Lu, S.; Händel, M.; Totsche, K.U.; Neu, T.R.; Iancu, V.V.; Tarcea, N.; Popp, J.; Küsel, K.;
Journal / Serie Microbiology-SGM
Erscheinungsjahr 2016
Department FLOEK;
Band/Volume 162
Sprache englisch;
POF III (gesamt) T32;
UFZ Querschnittsthemen RU2;
Abstract A new acidophilic iron-oxidizing strain (C25) belonging to the novel genus was isolated from pelagic iron-rich aggregates (‘iron snow’) collected below the redoxcline of an acidic lignite mine lake. Strain C25 catalysed the oxidation of ferrous iron [Fe(II)] under oxic conditions at 25 °C at a rate of 3.8 mM Fe(II) day in synthetic medium and 3.0 mM Fe(II) day in sterilized lake water in the presence of yeast extract, producing the rust-coloured, poorly crystalline mineral schwertmannite [Fe(III) oxyhydroxylsulfate]. During growth, rod-shaped cells of strain C25 formed long filaments, and then aggregated and degraded into shorter fragments, building large cell–mineral aggregates in the late stationary phase. Scanning electron microscopy analysis of cells during the early growth phase revealed that Fe(III)-minerals were formed as single needles on the cell surface, whereas the typical pincushion-like schwertmannite was observed during later growth phases at junctions between the cells, leaving major parts of the cell not encrusted. This directed mechanism of biomineralization at specific locations on the cell surface has not been reported from other acidophilic iron-oxidizing bacteria. Strain C25 was also capable of reducing Fe(III) under micro-oxic conditions which led to a dissolution of the Fe(III)-minerals. Thus, strain C25 appeared to have ecological relevance for both the formation and transformation of the pelagic iron-rich aggregates at oxic/anoxic transition zones in the acidic lignite mine lake.
ID 17202
dauerhafte UFZ-Verlinkung https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=17202
Mori, J.F., Lu, S., Händel, M., Totsche, K.U., Neu, T.R., Iancu, V.V., Tarcea, N., Popp, J., Küsel, K. (2016):
Schwertmannite formation at cell junctions by a new filament-forming Fe(II)-oxidizing isolate affiliated with the novel genus Acidithrix
Microbiology-(UK) 162 , 62 - 71