Kinetics and Mechanism of Mineral Respiration: How Iron Hemes Synchronize Electron Transfer Rates

Chabert, Valentin; Babel, Lucille; Füeg, Michael; Karamash, Maksym; Madivoli, Edwin Shigwenya; Hérault, Nelly; Dantas, Joana M.; Salgueiro, Carlos A.; Giese, Bernd; Fromm, Katharina M.

doi:10.1002/anie.201914873

Cited by 21 publications

(28 citation statements)

References 28 publications

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“…The Pd(II) complexes that adsorb to the cell in the initial biosorption step may act as seeds that contribute to the nal size and shape of the nanoparticles. Cell biomolecules contain functional groups that bind metals, 51 and peptides have been shown to act as capping agents that may direct or inhibit growth of nanoparticles, controlling their size and function. 52,53 In addition, these biomolecules will be responsible for stabilising bio-Pd nanoparticles during multiple reaction cycles, as the adsorption of reaction species during catalytic operation can alter nanoparticle size.…”

Section: Size and Shape Of Nanoparticlesmentioning

confidence: 99%

Biotechnological synthesis of Pd-based nanoparticle catalysts

et al. 2022

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Section: Size and Shape Of Nanoparticlesmentioning

confidence: 99%

Biotechnological synthesis of Pd-based nanoparticle catalysts

et al. 2022

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“…There may be other cytochromes that are indirectly involved in the electron transfer, for example, as a regulator for expression of other cytochromes as described above and electron sink or capacitor to monitor and regulate the redox status of cells and redox proteins in the electron transport chains (118,119). G. sulfurreducens appears to have homeostasis for electron flux by changing Fe(II)/Fe(III) ratios in the multiheme cytochromes (120).…”

Section: Perspectivesmentioning

confidence: 99%

Cytochromes in Extracellular Electron Transfer in Geobacter

Ueki

2021

Appl Environ Microbiol

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Extracellular electron transfer (EET) is an important biological process in microbial physiology as found in dissimilatory metal oxidation/reduction and interspecies electron transfer in syntrophy in natural environments. EET also plays a critical role in microorganisms relevant to environmental biotechnology in metal-contaminated areas, metal corrosion, bioelectrochemical systems, and anaerobic digesters. Geobacter species exist in a diversity of natural and artificial environments. One of the outstanding features of Geobacter species is the capability of direct EET with solid electron donors and acceptors including metals, electrodes, and other cells. Therefore, Geobacter species are pivotal in environmental biogeochemical cycles and biotechnology applications. Geobacter sulfurreducens, a representative Geobacter species, has been studied for the direct EET as a model microorganism. G. sulfurreducens employs electrically conductive pili (e-pili) and c-type cytochromes for the direct EET. The biological function and electronics applications of the e-pili have been reviewed recently and this review focuses on the cytochromes. Geobacter species have an unusually large number of cytochromes encoded in their genomes. Unlike most other microorganisms, Geobacter species localize multiple cytochromes in each subcellular fraction: outer membrane, periplasm, and inner membrane, as well as in the extracellular space, and differentially utilize these cytochromes for the EET with various electron donors and acceptors. Some of the cytochromes are functionally redundant. Thus, the EET in Geobacter is complicated. Geobacter coordinates the cytochromes with other cellular components in the elaborate EET system to flourish in the environment.

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“…Careful focused investigations at the molecular level are required to properly understand the biomineralization processes and molecular intermediates involved in the formation of metal NPs. [ 155 ]…”

Section: Mechanisms Of Microbial Synthesis Of Nanoparticlesmentioning

confidence: 99%

Metal Nanoparticle–Microbe Interactions: Synthesis and Antimicrobial Effects

Khan

Fromm

Rizvi

et al. 2020

Part & Part Syst Charact

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metal solution, reduction of the metal ions leads to the generation of metal atom clustering generating nanosized particles. A characteristic of biosynthetic NPs is their high stability as the organisms provide their own biomolecular capping agent(s). [1] While plant-based production of NPs is now considered a scientific curiosity rather than a promising biotechnology, [2] bacteriamediated NP biosynthesis offers better chances, in light of the poorly characterized microbial diversity and the complex chemistry of enzymes in metal-reducing bacteria. Two recent works focused on directed biofabrication of CdSe-nanoparticles through regulating extracellular electron transfer [3] and the biosynthesis of highly active copper NPs (CuNP) by Shewanella oneidensis. [4] However, the description of molecular mechanism(s) involved in the biosynthesis of NPs has received little attention, which is the focus of this review.The CFCF or culture supernatants (CS) of bacteria mediate the synthesis of AgNPs [5] as presented in this section. The CFCF from the family Enterobacteriaceae reduce silver ions to AgNPs ( Table 1). CFCF of Klebsiella pneumoniae, Escherichia coli, and Metal nanoparticles (NPs), chalcogenides, and carbon quantum dots can be easily synthesized from whole microorganisms (fungi and bacteria) and cell-free sterile filtered spent medium. The particle size distribution and the biosynthesis time can be somewhat controlled through the biomass/metal solution ratio. The biosynthetic mechanism can be explained through the ionreduction theory and UV photoconversion theory. Formation of biosynthetic NPs is part of the detoxification strategy employed by microorganisms, either in planktonic or biofilm form, to reduce the chemical toxicity of metal ions. In fact, most reports on NP biosynthesis show extracellular metal ion reduction. This is important for environmental and industrial applications, particularly in biofilms, as it allows in principle high biosynthetic rates. The antimicrobial and antifungal effect on biosynthetic NPs can be explained in terms of reactive oxygen species and can be enhanced by the capping agents attached to the NP during the biosynthesis process. Industrial applications of NP biosynthesis are still lagging, due to the difficulty of controlling NP size and low titer. Further, the environmental assessment of biosynthetic NPs has not yet been carried out. It is expected that further advancements in biosynthetic NP research will lead to applications, particularly in environmental biotechnology.

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Kinetics and Mechanism of Mineral Respiration: How Iron Hemes Synchronize Electron Transfer Rates

Cited by 21 publications

References 28 publications

Biotechnological synthesis of Pd-based nanoparticle catalysts

Biotechnological synthesis of Pd-based nanoparticle catalysts

Cytochromes in Extracellular Electron Transfer in Geobacter

Metal Nanoparticle–Microbe Interactions: Synthesis and Antimicrobial Effects

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