Extracellular Iron Biomineralization by Photoautotrophic Iron-Oxidizing Bacteria

Miot, Jennyfer; Benzerara, Karim; Obst, Martin; Kappler, Andreas; Hegler, Florian; Schädler, Sebastian; Bouchez, Camille; Guyot, F.; Morin, Guillaume

doi:10.1128/aem.00490-09

Cited by 156 publications

(126 citation statements)

References 29 publications

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“…The reference spectra used in this study were NEXAFS C1s spectra of standard compounds alginate (used as polysaccharide standard), albumin (used as protein standard) and 1,2-dipalmotoylsn-glycero-3-phosphocholine (used as aliphatic compound standard). These compounds were shown to represent the major constituents of microbial biofilms in various studies [65][66][67][68] .…”

Section: Methodsmentioning

confidence: 99%

Experimental diagenesis of organo-mineral structures formed by microaerophilic Fe(II)-oxidizing bacteria

et al. 2015

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Twisted stalks are organo-mineral structures produced by some microaerophilic Fe(II)-oxidizing bacteria at O 2 concentrations as low as 3 mM. The presence of these structures in rocks having experienced a diagenetic history could indicate microbial Fe(II)-oxidizing activity as well as localized abundance of oxygen at the time of sediment deposition. Here we use spectroscopy and analytical microscopy to evaluate if-and what kind of-transformations occur in twisted stalks through experimental diagenesis. Unique mineral textures appear on stalks as temperature and pressure conditions increase. Haematite and magnetite form from ferrihydrite at 170°C-120 MPa. Yet the twisted morphology of the stalks, and the organic matrix, mainly composed of long-chain saturated aliphatic compounds, are preserved at 250°C-140 MPa. Our results suggest that iron minerals might play a role in maintaining the structural and chemical integrity of stalks under diagenetic conditions and provide spectroscopic signatures for the search of ancient life in the rock record.

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Section: Methodsmentioning

confidence: 99%

Experimental diagenesis of organo-mineral structures formed by microaerophilic Fe(II)-oxidizing bacteria

et al. 2015

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“…Such bacteria are known to promote the formation of Fe-oxyhydroxides, such as goethite [18,19]. (2) Nitrate-dependent Fe(II)-oxidizing bacteria may also be present in the water column of meromictic lakes, as suggested by electron and X-ray microscopy analyses of Lake Pavin samples [20].…”

Section: Introductionmentioning

confidence: 99%

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

et al. 2016

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Abstract:As biominerals are good tracers of microbial interactions with the environment, they may provide signatures of microbial evolution and paleoenvironmental conditions. Since modern analogues of past environments help with defining proxies and biosignatures, we explored microbe mineral interactions in the water column of a maar lake, located in France: Lake Pavin. This lake is considered as a potential Precambrian ocean analogue, as it is ferruginous and meromictic, i.e., stratified with a superficial O 2 -rich layer (mixolimnion) and a deeper permanently anoxic layer (monimolimnion). We combined bulk chemical analyses of dissolved and particulate matter in combination with electron microscopy analyses of the particulate matter at different depths along the water column. The mineralogy changed along with water chemistry, and most of the minerals were intimately associated with microorganisms. Evolution of the redox conditions with depth leads to the successive precipitation of silica and carbonates, Mn-bearing, Fe-bearing and S-containing phases, with a predominance of phosphates in the monimolimnion. This scheme parallels the currently-assessed changes of microbial diversity with depth. The present results corroborate previous studies that suggested a strong influence of microbial activity on mineralogical diversity through extracellular and intracellular biomineralization. This paper reports detailed data on mineralogical profiles of the water column and encourages extended investigation of these processes.

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“…The structures are produced by the bacteria as a means to control the secretion of oxidized iron that results from iron oxidation (equation (1.1)) and prevent bacterial selfentombment [27,28,57]. Molecular analysis of the biofilms confirms the presence of 16S rRNA gene sequences belonging to Gallionella (figure 2d), a member of the b-proteobacteria.…”

Section: (B) Continental Riverine Environmentsmentioning

confidence: 79%

“…Ironoxidizing bacteria are capable of using reduced iron, coupled with electron acceptors (such as oxygen in the case of aerobic iron oxidation and nitrate in the case of anaerobic iron oxidation) to conserve energy for growth. They are also capable of carrying out iron oxidation using light ( [17][18][19][20][21][22][23][24][25][26][27][28]; equations (1.1)-(1.3)).…”

Section: Introductionmentioning

confidence: 99%

Life in the lithosphere, kinetics and the prospects for life elsewhere

Cockell

2011

Phil. Trans. R. Soc. A.

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The global contiguity of life on the Earth today is a result of the high flux of carbon and oxygen from oxygenic photosynthesis over the planetary surface and its use in aerobic respiration. Life's ability to directly use redox couples from components of the planetary lithosphere in a pre-oxygenic photosynthetic world can be investigated by studying the distribution of organisms that use energy sources normally bound within rocks, such as iron. Microbiological data from Iceland and the deep oceans show the kinetic limitations of living directly off igneous rocks in the lithosphere. Using energy directly extracted from rocks the lithosphere will support about six orders of magnitude less productivity than the present-day Earth, and it would be highly localized. Paradoxically, the biologically extreme conditions of the interior of a planet and the inimical conditions of outer space, between which life is trapped, are the locations from which volcanism and impact events, respectively, originate. These processes facilitate the release of redox couples from the planetary lithosphere and might enable it to achieve planetary-scale productivity approximately one to two orders of magnitude lower than that produced by oxygenic photosynthesis. The significance of the detection of extra-terrestrial life is that it will allow us to test these observations elsewhere and establish an understanding of universal relationships between lithospheres and life. These data also show that the search for extra-terrestrial life must be accomplished by 'following the kinetics', which is different from following the water or energy.

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Extracellular Iron Biomineralization by Photoautotrophic Iron-Oxidizing Bacteria

Cited by 156 publications

References 29 publications

Experimental diagenesis of organo-mineral structures formed by microaerophilic Fe(II)-oxidizing bacteria

Experimental diagenesis of organo-mineral structures formed by microaerophilic Fe(II)-oxidizing bacteria

Mineralogical Diversity in Lake Pavin: Connections with Water Column Chemistry and Biomineralization Processes

Life in the lithosphere, kinetics and the prospects for life elsewhere

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