Extracellular electron transfer mechanisms between microorganisms and minerals

Shi, Liang; Dong, Hailiang; Reguera, Gemma; Beyenal, Haluk; Lu, Anhuai; Liu, Juan; Yu, Han; Fredrickson, James K.

doi:10.1038/nrmicro.2016.93

Cited by 1,328 publications

(915 citation statements)

References 156 publications

Supporting

Mentioning

853

Contrasting

Unclassified

Order By: Relevance

“…In recent years, the interaction between soil minerals and microbes has become a hot topic in related disciplines. In 2016, Shi et al published a review in the Journal of Nature Review on microbes [6], which systematically summarized the mechanism of interaction between minerals and microbes, focusing on two basic sciences of energy and extracellular electron transfer. In addition, domestic and foreign scholars have studied the different systems and related mechanism of soil mineral-microbial interaction, involving the microbial adsorption process on the surface of minerals [7,8]; they also studied the relationship between mineral-microbial-soil contaminants.…”

Section: Introductionmentioning

confidence: 99%

Effects of Montmorillonite on the Mineralization and Cementing Properties of Microbiologically Induced Calcium Carbonate

Zhu¹,

Li²,

Shi³

et al. 2017

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

Carbonate mineralization microbe is a microorganism capable of decomposing the substrate in the metabolic process to produce the carbonate, which then forms calcium carbonate with calcium ions. By taking advantage of this process, contaminative uranium tailings can transform to solid cement, where calcium carbonate plays the role of a binder. In this paper, we have studied the morphology of mineralized crystals by controlling the mineralization time and adding different concentrations of montmorillonite (MMT). At the same time, we also studied the effect of carbonate mineralized cementation uranium tailings by controlling the amount of MMT. The results showed that MMT can regulate the crystal morphology of calcium carbonate. What is more, MMT can balance the acidity and ions in the uranium tailings; it also can reduce the toxicity of uranium ions on microorganisms. In addition, MMT filling in the gap between the uranium tailings made the cement body more stable. When the amount of MMT is 6%, the maximum strength of the cement body reached 2.18 MPa, which increased by 47.66% compared with that the sample without MMT. Therefore, it is reasonable and feasible to use the MMT to regulate the biocalcium carbonate cemented uranium tailings.

show abstract

Section: Introductionmentioning

confidence: 99%

Effects of Montmorillonite on the Mineralization and Cementing Properties of Microbiologically Induced Calcium Carbonate

Zhu¹,

Li²,

Shi³

et al. 2017

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

show abstract

“…Thus, the protein nanowires provide a dual strategy for energy conservation and cellular protection from the toxic uranyl cation. Geobacter cells also express substantial quantities of c‐Cyts during the reduction in metals (Shi et al ., 2016). These c‐Cyts localize to the inner membrane, periplasmic space and outer membrane, providing a potential path for the transfer of electrons to the cell surface.…”

Section: A Nanowire Pathway For Metal Reductionmentioning

confidence: 99%

Harnessing the power of microbial nanowires

Reguera

2018

Microbial Biotechnology

Self Cite

View full text Add to dashboard Cite

SummaryThe reduction of iron oxide minerals and uranium in model metal reducers in the genus Geobacter is mediated by conductive pili composed primarily of a structurally divergent pilin peptide that is otherwise recognized, processed and assembled in the inner membrane by a conserved Type IVa pilus apparatus. Electronic coupling among the peptides is promoted upon assembly, allowing the discharge of respiratory electrons at rates that greatly exceed the rates of cellular respiration. Harnessing the unique properties of these conductive appendages and their peptide building blocks in metal bioremediation will require understanding of how the pilins assemble to form a protein nanowire with specialized sites for metal immobilization. Also important are insights into how cells assemble the pili to make an electroactive matrix and grow on electrodes as biofilms that harvest electrical currents from the oxidation of waste organic substrates. Genetic engineering shows promise to modulate the properties of the peptide building blocks, protein nanowires and current‐harvesting biofilms for various applications. This minireview discusses what is known about the pilus material properties and reactions they catalyse and how this information can be harnessed in nanotechnology, bioremediation and bioenergy applications.

show abstract

“…Microorganisms interact with minerals available in the environment (Zhou et al, 2014;Ng et al, 2016;Shi et al, 2016). This has led to the field of bioremediation, the study of the insertion and/or manipulation of organisms in certain areas to reduce environmental pollutants.…”

Section: Introductionmentioning

confidence: 99%

Modeling Substrate Utilization, Metabolite Production, and Uranium Immobilization in Shewanella oneidensis Biofilms

Renslow

Ahmed

Nuñez

et al. 2017

Front. Environ. Sci.

Self Cite

View full text Add to dashboard Cite

In this study, we developed a two-dimensional mathematical model to predict substrate utilization and metabolite production rates in Shewanella oneidensis MR-1 biofilm in the presence and absence of uranium (U). In our model, lactate and fumarate are used as the electron donor and the electron acceptor, respectively. The model includes the production of extracellular polymeric substances (EPS). The EPS bound to the cell surface and distributed in the biofilm were considered bound EPS (bEPS) and loosely associated EPS (laEPS), respectively. COMSOL ® Multiphysics finite element analysis software was used to solve the model numerically (model file provided in the Supplementary Material). The input variables of the model were the lactate, fumarate, cell, and EPS concentrations, half saturation constant for fumarate, and diffusion coefficients of the substrates and metabolites. To estimate unknown parameters and calibrate the model, we used a custom designed biofilm reactor placed inside a nuclear magnetic resonance (NMR) microimaging and spectroscopy system and measured substrate utilization and metabolite production rates. From these data we estimated the yield coefficients, maximum substrate utilization rate, half saturation constant for lactate, stoichiometric ratio of fumarate and acetate to lactate and stoichiometric ratio of succinate to fumarate. These parameters are critical to predicting the activity of biofilms and are not available in the literature. Lastly, the model was used to predict uranium immobilization in S. oneidensis MR-1 biofilms by considering reduction and adsorption processes in the cells and in the EPS. We found that the majority of immobilization was due to cells, and that EPS was less efficient at immobilizing U. Furthermore, most of the immobilization occurred within the top 10 µm of the biofilm. To the best of our knowledge, this research is one of the first biofilm immobilization mathematical models based on experimental observation. It has the ability to predict the relative contributions to U immobilization of laEPS, bEPS, and cells.

show abstract

Extracellular electron transfer mechanisms between microorganisms and minerals

Cited by 1,328 publications

References 156 publications

Effects of Montmorillonite on the Mineralization and Cementing Properties of Microbiologically Induced Calcium Carbonate

Effects of Montmorillonite on the Mineralization and Cementing Properties of Microbiologically Induced Calcium Carbonate

Harnessing the power of microbial nanowires

Modeling Substrate Utilization, Metabolite Production, and Uranium Immobilization in Shewanella oneidensis Biofilms

Contact Info

Product

Resources

About