Strategies of aerobic microbial Fe acquisition from Fe-bearing montmorillonite clay

Kuhn, Keshia M.; DuBois, Jennifer L.; Maurice, Patricia A.

doi:10.1016/j.gca.2013.04.028

Cited by 21 publications

(35 citation statements)

References 57 publications

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“…Solubilization of the same amount of Fe required greater production of organic acids for biotite than for phlogopite. Iron can be released in several ways, mainly by acid dissolution, secretion of siderophores (Balland et al, 2010) and Fe reduction, leading typically to partial mineral dissolution (Kuhn et al, (2013)). Microbes may have to use more than one strategy (Kuhn et al, (2013)) or switch from one to another in order to be effective in the Fe-extraction process.…”

Section: Symbiotic Structuresmentioning

confidence: 99%

Clay minerals interaction with microorganisms: a review

2017

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Interest in mineral–microbe interaction has grown enormously over recent decades, providing information in a puzzle-like manner which points towards an ever increasingly intimate relationship between the two; a relationship that can be truly termed co-evolution. Clay minerals play a very central role in this co-evolving system. Some 20 years ago, clay scientists looked at clay mineral–microbe studies as a peripheral interest only. Now, can clay scientists think that they understand the formation of clay minerals throughout geological history if they do not include life in their models? The answer is probably no, but we do not yet know the relative weight of biological and inorganic factors involved in driving clay-mineral formation and transformation. Similarly, microbiologists are missing out important information if they do not investigate the influence and modifications that minerals, particularly clay minerals, have on microbial activity and evolution. This review attempts to describe the several points relating clay minerals and microorganisms that have been discovered so far. The information obtained is still very incomplete and many opportunities exist for clay scientists to help to write the real history of the biosphere.

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Section: Symbiotic Structuresmentioning

confidence: 99%

Clay minerals interaction with microorganisms: a review

2017

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“…Furthermore, inorganic ferric iron can be acquired directly using ATP-binding cassette transporters that are frequently detected in marine bacterial genomes [31,32]. In addition, surface-associated reductases allow uptake from particulate iron [33][34][35], outer membrane receptors mediate uptake of iron bound to exogenous chelators like heme or transferrin [36], and ferric citrate can be taken up via transporters or porins [37].…”

Section: Introductionmentioning

confidence: 99%

Why microbes secrete molecules to modify their environment: the case of iron-chelating siderophores

Leventhal

Ackermann

Schiessl

2019

J. R. Soc. Interface.

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Many microorganisms secrete molecules that interact with resources outside of the cell. This includes, for example, enzymes that degrade polymers like chitin, and chelators that bind trace metals like iron. In contrast to direct uptake via the cell surface, such release strategies entail the risk of losing the secreted molecules to environmental sinks, including ‘cheating’ genotypes. Nevertheless, such secretion strategies are widespread, even in the well-mixed marine environment. Here, we investigate the benefits of a release strategy whose efficiency has frequently been questioned: iron uptake in the ocean by secretion of iron chelators called siderophores. We asked the question whether the release itself is essential for the function of siderophores, which could explain why this risky release strategy is widespread. We developed a reaction–diffusion model to determine the impact of siderophore release on iron uptake from the predominant iron sources in marine environments, colloidal or particulate iron, formed due to poor iron solubility. We found that release of siderophores is essential to accelerate iron uptake, as secreted siderophores transform slowly diffusing large iron particles to small, quickly diffusing iron–siderophore complexes. In addition, we found that cells can synergistically share their siderophores, depending on their distance and the size of the iron sources. Our study helps understand why release of siderophores is so widespread: even though a large fraction of siderophores is lost, the solubilization of iron through secreted siderophores can efficiently increase iron uptake, especially if siderophores are produced cooperatively by several cells. Overall, resource uptake mediated via release of molecules transforming their substrate could be essential to overcome diffusion limitation specifically in the cases of large, aggregated resources. In addition, we find that including the reaction of the released molecule with the substrate can impact the result of cooperative and competitive interactions, making our model also relevant for release-based uptake of other substrates.

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“…Biological reduction of mineral-Fe occurs by cell surfacebound reductases or via release of Fe-reducing compounds into the surrounding milieu (Whooley and McLoughlin, 1982;Hernandez, 2001;Kuhn et al, 2013). In reductive dissolution, conversion of mineral Fe(III) to more soluble Fe(II) facilitates detachment and accelerates dissolution (Suter et al, 1991).…”

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confidence: 99%

Investigation of Siderophore-Promoted and Reductive Dissolution of Dust in Marine Microenvironments Such as Trichodesmium Colonies

et al. 2020

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Bio-Enhanced Dust Dissolution Fe-quotas and growth rates we calculated the Fe requirements of the colonies under Felimited and Fe-replete conditions. The calculated dissolved Fe supply from dust retained within colonies can fulfill the Fe requirements of slow growing Fe-limited colonies, but cannot support fast growth and/or higher cellular Fe quotas. We conclude that despite these bio-dissolution mechanisms, dust-Fe availability to Trichodesmium is low and propose that it employs additional mechanisms to actively mine Fe from dust.

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Strategies of aerobic microbial Fe acquisition from Fe-bearing montmorillonite clay

Cited by 21 publications

References 57 publications

Clay minerals interaction with microorganisms: a review

Clay minerals interaction with microorganisms: a review

Why microbes secrete molecules to modify their environment: the case of iron-chelating siderophores

Investigation of Siderophore-Promoted and Reductive Dissolution of Dust in Marine Microenvironments Such as Trichodesmium Colonies

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