Correction for 'Geobacter sulfurreducens pili support ohmic electronic conduction in aqueous solution' by Nicole L. Ing et al., Phys. Chem. Chem. Phys., 2017, 19, 21791-21799.
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Mixed electronic-ionic conductors are crucial for various technologies, including harvesting power from humidity in a durable, self-sustainable, manner unrestricted by location or environment . Biological proteins have been proposed as mixed conductors for 50 years . Recently, pili filaments have been claimed to act as nanowires to generate power .
View Article and Find Full Text PDFInfluence of support materials on the electroactive behavior, structure and gene expression of wild type and GSU1771-deficient mutant of Geobacter sulfurreducens biofilms.
Environ Sci Pollut Res Int
May 2024
Departamento de Ingeniería Celular y Biocatálisis, Instituto de Biotecnología, Universidad Nacional Autónoma de México, Av. Universidad 2001. Col. Chamilpa, 62210, Cuernavaca, Morelos, México.
Geobacter sulfurreducens DL1 is a metal-reducing dissimilatory bacterium frequently used to produce electricity in bioelectrochemical systems (BES). The biofilm formed on electrodes is one of the most important factors for efficient electron transfer; this is possible due to the production of type IV pili and c-type cytochromes that allow it to carry out extracellular electron transfer (EET) to final acceptors. In this study, we analyzed the biofilm formed on different support materials (glass, hematite (FeO) on glass, fluorine-doped tin oxide (FTO) semiconductor glass, FeO on FTO, graphite, and stainless steel) by G.
View Article and Find Full Text PDFLack of physiological evidence for cytochrome filaments functioning as conduits for extracellular electron transfer.
mBio
May 2024
Department of Microbiology, University of Massachusetts Amherst, Amherst, Massachusetts, USA.
Unlabelled: Extracellular cytochrome filaments are proposed to serve as conduits for long-range extracellular electron transfer. The primary functional physiological evidence has been the reported inhibition of Fe(III) oxide reduction when the gene for the filament-forming cytochrome OmcS is deleted. Here we report that the OmcS-deficient strain from that original report reduces Fe(III) oxide as well as the wild-type, as does a triple mutant in which the genes for the other known filament-forming cytochromes were also deleted.
View Article and Find Full Text PDFTranscriptomic insights unveil the crucial roles of cytochromes, NADH, and pili in Ag(I) reduction by Geobacter sulfurreducens.
Chemosphere
June 2024
Beijing Key Lab for Source Control Technology of Water Pollution, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China; Engineering Research Center for Water Pollution Source Control & Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, China. Electronic address:
Silver (Ag) is a pivotal transition metal with applications in multiple industries, necessitating efficient recovery techniques. Despite various proposed methods for silver recovery from wastewaters, challenges persist especially for low concentrations. In this context, bioreduction by bacteria like Geobacter sulfurreducens, offers a promising approach by converting Ag(I) to Ag nanoparticles.
View Article and Find Full Text PDFTo be or not to be a cytochrome: electrical characterizations are inconsistent with cytochrome 'nanowires'.
Front Microbiol
April 2024
Department of Chemistry and Biochemistry, Baylor University, Waco, TX, United States.
profoundly shapes Earth's biogeochemistry by discharging respiratory electrons to minerals and other microbes through filaments of a two-decades-long debated identity. Cryogenic electron microscopy has revealed filaments of redox-active cytochromes, but the same filaments have exhibited hallmarks of organic metal-like conductivity under cytochrome denaturing/inhibiting conditions. Prior structure-based calculations and kinetic analyses on multi-heme proteins are synthesized herein to propose that a minimum of ~7 cytochrome 'nanowires' can carry the respiratory flux of a cell, which is known to express somewhat more (≥20) filaments to increase the likelihood of productive contacts.
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