Microbial extracellular electron transfer and its relevance to iron corrosion

Kato, Souichiro

doi:10.1111/1751-7915.12340

Cited by 147 publications

(74 citation statements)

References 72 publications

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“…This feature confers the bacteria great potential in bioremediation of heavy metals and energy generation via microbial fuel cells23. Moreover, because many physiological traits are either not found in or distinct from well-characterized model microorganisms such as Escherichia coli , the genus representative, Shewanella oneidensis is now emerging as a research model for general bacterial physiology45.…”

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confidence: 99%

NapB in excess inhibits growth of Shewanella oneidensis by dissipating electrons of the quinol pool

Jin

Zhang

Sun

et al. 2016

Sci Rep

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Shewanella, a group of ubiquitous bacteria renowned for respiratory versatility, thrive in environments where various electron acceptors (EAs) of different chemical and physiological characteristics coexist. Despite being extensively studied, we still know surprisingly little about strategies by which multiple EAs and their interaction define ecophysiology of these bacteria. Previously, we showed that nitrite inhibits growth of the genus representative Shewanella oneidensis on fumarate and presumably some other CymA (quinol dehydrogenase)-dependent EAs by reducing cAMP production, which in turn leads to lowered expression of nitrite and fumarate reductases. In this study, we demonstrated that inhibition of fumarate growth by nitrite is also attributable to overproduction of NapB, the cytochrome c subunit of nitrate reductase. Further investigations revealed that excessive NapB per se inhibits growth on all EAs tested, including oxygen. When overproduced, NapB acts as an electron shuttle to dissipate electrons of the quinol pool, likely to extracellullar EAs, because the Mtr system, the major electron transport pathway for extracellular electron transport, is implicated. The study not only sheds light on mechanisms by which certain EAs, especially toxic ones, impact the bacterial ecophysiology, but also provides new insights into how electron shuttle c-type cytochromes regulate multi-branched respiratory networks.

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confidence: 99%

NapB in excess inhibits growth of Shewanella oneidensis by dissipating electrons of the quinol pool

Jin

Zhang

Sun

et al. 2016

Sci Rep

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“…The ability to utilize certain nutrients, producing metabolites that affect other microorganisms and interacting with the physical and chemical environment are the factors that determine the growth of a microorganism. These conditions define the activity and growth character of a species, which is different from the other species (Kato, 2016). The ability to grow at room temperature is a very important factor for the efficient application of SRB isolates in bioreactors.…”

Section: Isolation and Characterizationmentioning

confidence: 99%

“…The results are shown in Table 5 and the photograph of the isolates in Figure 2. Endospores have very high resistance to heat and are not easily damaged by the effects of chemicals, dryness, radiation, acidity, and dormant for a very long time (Kato, 2016). In Figure 2c, the spherical endospores are in contrast to their rodshaped vegetative cells.…”

Section: Cell Morphology and Physiologymentioning

confidence: 99%

Exploration of sulfate reducing bacteria from polluted waters

Suyasa¹,

Suprihatin²,

Suastuti³

et al. 2018

Afr. J. Microbiol. Res.

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Sulfate reducing bacteria (SRB) was successfully isolated from Estuary Dam in Suwung Denpasar,Indonesia. This estuary catches highly polluted water from Badung River which runs across and hence carries pollution due to waste disposal from Denpasar City. SRB was studied in detail for their ability to reduce sulfate to sulfide with organic material as an oxidizing agent. SRB exploration of the estuary ecosystem of the contaminated dam was accomplished through isolation, selection and characterization of the isolates obtained. The result of this study found superior SRB named DPS 1711, DPS 1705 and DPS 1703. The bacteria have the ability to grow at pH 3, room temperature and uses compost as organic substrate. This ability is an important factor for the application of isolates in the treatment of acid mine waste. Isolates have optimum optical density under the pH range of 4 to 7 and the best at pH 5 have a growth rate profile at a temperature range of 25 to 40°C. The isolates observed were Gram-negative stem, motile bacteria which only grow in anaerobic condition. Physiological-biochemical characterization showed the three isolates, namely DPS 1703, DPS 1705 and DPS 1711 were SRB groups identified as Desulfotomaculum orientis.

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“…Electron transfer from iron surfaces, resulting in reactive corrosion of the surface (generally in an oxidation reaction), has long been a problem in the industry, particularly on steel surfaces (Enning and Garrelfs 2014;Kato 2016) due to the widespread use of steel in infrastructure (Gerhardus H. Koch and Brongers 2002).…”

Section: Environmental Occurrencementioning

confidence: 99%

“…MIC has been modelled for copper (Pizarro et al 2014), however the only wellknown environment for electroactive MIC to date is for iron (Kato 2016); as such, alternative metallic surfaces are not considered in this thesis.…”

Section: Corrosionmentioning

confidence: 99%

Mathematical modelling of electron transfer modes in electroactive microorganisms

Fischer¹

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Electroactive microorganisms (EAMs) are known to function in a variety of systems, and receive strong focus in scientific investigation; microbial fuel cells (MFCs) and microbial electrolysis cells (MECs) are two key fields utilising these microorganisms to date. Microbially influenced corrosion (MIC) and the conduction of filamentous bacteria in ocean sediments also make use of external electrical currents to enable growth in what otherwise may be an abiotic environment. With the discovery of more of these systems and a growing understanding of their relevance over the past couple of decades, research into them has been steadily increasing. Electrochemical techniques such as cyclic voltammetry and impedance analysis have been used to gain a greater understanding of the system. However, mechanistic model-based analysis has lagged behind, with the fundamentals and consequences of electron transfer still not fully understood. Mechanistic investigation is vital for the progression and furthering of related research, and for highlighting the interactions occurring within EAMs, as many processes occur at a level that cannot be resolved by experimental systems. While a number of models have described extracellular electron transfer, in particular, for MFCs, none have analysed short-range electrontransfer mechanisms on a comparative basis. This thesis uses common finiteelement and electrochemical diffusive-reactive modelling techniques to investigate electroactive organisms in highly diverse environments. One such system is a filamentous sulfide-oxidising system in ocean sediment. Filamentous bacteria grow between sulfide-rich and oxygen-rich regions, transferring electrons between selfdetermined anodic and cathodic zones. Splitting of the metabolic pathway between partners allows growth to be determined thermodynamically rather than empirically, with bacteria releasing or consuming electrons depending upon the available substrate. This modelling approach determined that the bacteria, while electroactive, cannot grow with the rates seen experimentally, and highlighted that the current conceptual picture is incomplete. A similar approach is used to investigate microbially influenced corrosion, showing that direct electrical uptake greatly exacerbates corrosion when compared to a purely chemical system, due to the shifting of the electrical potential of the metal and the subsequent increase in electrochemical rates. This model of corrosion rates in carbon steel showed the variability with changing environmental conditions and bacterial activity, ranging from ii as little as 0.05 mm/yr to a very significant 1.5 mm/yr with highly aggressive biofilms.

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Microbial extracellular electron transfer and its relevance to iron corrosion

Cited by 147 publications

References 72 publications

NapB in excess inhibits growth of Shewanella oneidensis by dissipating electrons of the quinol pool

NapB in excess inhibits growth of Shewanella oneidensis by dissipating electrons of the quinol pool

Exploration of sulfate reducing bacteria from polluted waters

Mathematical modelling of electron transfer modes in electroactive microorganisms

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