Deciphering the Electron Transport Pathway for Graphene Oxide Reduction by Shewanella oneidensis MR-1

Jiao, Yongqin; Qian, Fang; Li, Yat; Wang, Gongming; Saltikov, Chad W.; Gralnick, Jeffrey A.

doi:10.1128/jb.00201-11

Cited by 85 publications

(70 citation statements)

References 22 publications

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“…† These inorganic elements originated from the soil minerals. 3,19,28 The mechanism underlying the bacterial transformation of PGO involves reduction during bacterial respiration for Shewanella and glycolysis for Escherichia coli, and PGO acts as a terminal electron acceptor in the reduction processes. 12 Fig.…”

Section: Changes In Surface Chemical Groupsmentioning

confidence: 99%

Graphene oxide regulates the bacterial community and exhibits property changes in soil

Zhou

2015

RSC Adv.

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The extensive use of pristine graphene oxide (PGO) increases its environmental release. The interactions of PGO with soils, one of the ultimate repositories for discharged nanomaterial, remain unclear. In the present study, a pyrosequencing analysis based on the bacterial 16S rRNA gene showed that the bacterial community in a PGO-soil sample (PGOS) became richer and more diverse compared with a control soil sample (CS). PGO altered the structure of soil bacterial communities, with some nitrogen-fixing and dissimilatory iron reducing bacteria being selectively enriched, especially at the genus level. SGO (soilmodified graphene oxide) exhibited a greater thickness, a higher C/O ratio, a rougher texture, a lower transparency and a smaller size than PGO. Nitrogen-containing groups and the elements including Mg, Al, Si, K, Ca and Fe were detected in SGO. The changes in surface groups were consistent with the formation of organic molecules coating the SGO. SGO, which exhibited fewer negative charges, was more unstable than PGO. In addition, SGO presented higher chemical activity than PGO; for example, SGO exhibited more unpaired electrons and disordered structures. This work highlights the critical interactions of PGO and soil which deserve comprehensive consideration in assessing the risks of nanomaterials. † Electronic supplementary information (ESI) available: Table S1 presenting the physicochemical properties of the collected soil. Table S2 listing the data of richness and diversity of bacterial communities in PGO-soil sample (PGOS) and control soil sample (CS) analyzed from pyrosequencing. Table S3 listing the organic molecules extracted from the raw soil sample. Fig. S1 presenting the photographs of separation of SGO (soil-modied graphene oxide) and the photographs of SGO powders. Fig. S2 and S3 showing the characteristics of bacterial communities. Fig. S4 being the SEM, TEM and EDS results. Fig. S5 being the AFM images. Fig. S6 presenting the wide spectra of XPS of PGO and SGO. Fig. S7 presenting FTIR spectra of PGO and SGO. Fig. S8 showing the organic molecules extracted from SGO. Fig. S9 showing the distribution and surface charge of the nanomaterials. See

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Section: Changes In Surface Chemical Groupsmentioning

confidence: 99%

Graphene oxide regulates the bacterial community and exhibits property changes in soil

Zhou

2015

RSC Adv.

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“…Recently, graphene oxide was presented as another target for extracellular respiration (35,78). The reduction of graphene oxide is typically part of the graphene production process.…”

Section: Extracellular Electron Acceptorsmentioning

confidence: 99%

Dissimilatory Reduction of Extracellular Electron Acceptors in Anaerobic Respiration

Richter

Schicklberger

Gescher

2012

Appl Environ Microbiol

246

181

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An extension of the respiratory chain to the cell surface is necessary to reduce extracellular electron acceptors like ferric iron or manganese oxides. In the past few years, more and more compounds were revealed to be reduced at the surface of the outer membrane of Gram-negative bacteria, and the list does not seem to have an end so far. Shewanella as well as Geobacter strains are model organisms to discover the biochemistry that enables the dissimilatory reduction of extracellular electron acceptors. In both cases, c-type cytochromes are essential electron-transferring proteins. They make the journey of respiratory electrons from the cytoplasmic membrane through periplasm and over the outer membrane possible. Outer membrane cytochromes have the ability to catalyze the last step of the respiratory chains. Still, recent discoveries provided evidence that they are accompanied by further factors that allow or at least facilitate extracellular reduction. This review gives a condensed overview of our current knowledge of extracellular respiration, highlights recent discoveries, and discusses critically the influence of different strategies for terminal electron transfer reactions.

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“…Furthermore, several different laboratories have demonstrated that mutants in mtrC, mtrB or mtrA are unable to grow with Fe(III) citrate as electron acceptor (Beliaev & Saffarini, 1998;Beliaev et al, 2001;Borloo et al, 2007;Hartshorne et al, 2009;Myers & Myers, 2002b). MtrA, MtrB and MtrC build the electron conduit to the cell surface, and MtrC is probably the most influential terminal reductase for extracellular respiration in S. oneidensis (Belchik et al, 2011;Beliaev et al, 2001;Jiao et al, 2011;Marshall et al, 2006;Reardon et al, 2010). All this seems to be in disagreement with the experiments conducted by Qian and co-workers.…”

Section: Discussionmentioning

confidence: 99%

Outer-membrane cytochrome-independent reduction of extracellular electron acceptors in Shewanella oneidensis

et al. 2012

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Deciphering the Electron Transport Pathway for Graphene Oxide Reduction by Shewanella oneidensis MR-1

Cited by 85 publications

References 22 publications

Graphene oxide regulates the bacterial community and exhibits property changes in soil

Graphene oxide regulates the bacterial community and exhibits property changes in soil

Dissimilatory Reduction of Extracellular Electron Acceptors in Anaerobic Respiration

Outer-membrane cytochrome-independent reduction of extracellular electron acceptors in Shewanella oneidensis

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