Energy Generation Coupled to Azoreduction by Membranous Vesicles from Shewanella decolorationis S12

Hong, Yi Guo; Guo, Jun; Sun, Guo

doi:10.4014/jmb.0805.321

Cited by 3 publications

(6 citation statements)

References 23 publications

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“…Most of the anaerobic reduction processes are location specific but can take place both in cytoplasmic and membrane fractions isolated from bacterial cells (Kudlich et al, 1997). However, an essential component required for electron transport from electron donors to azo compounds is thought to be located in membrane fractions from bacterial cell extracts (Hong et al, 2007a(Hong et al, , 2009). This implies that the coupling of oxidation of electron donor and reduction of azo dyes is a universal biochemical phenomenon for azo dyes degradation.…”

Section: Sphingomonas Paucimobilismentioning

confidence: 99%

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Ibekwe

Yang

et al. 2016

Science of The Total Environment

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Azo dyes and their intermediate degradation products are common contaminants of soil and groundwater in developing countries where textile and leather dye products are produced. The toxicity of azo dyes is primarily associated with their molecular structure, substitution groups and reactivity. To avoid contamination of natural resources and to minimize risk to human health, this wastewater requires treatment in an environmentally safe manner. This manuscript critically reviews biological treatment systems and the role of bacterial reductive and oxidative enzymes/processes in the bioremediation of dye-polluted wastewaters. Many studies have shown that a variety of culturable bacteria have efficient enzymatic systems that can carry out complete mineralization of dye chemicals and their metabolites (aromatic compounds) over a wide range of environmental conditions. Complete mineralization of azo dyes generally involves a two-step process requiring initial anaerobic treatment for decolorization, followed by an oxidative process that results in degradation of the toxic intermediates that are formed during the first step. Molecular studies have revealed that the first reductive process can be carried out by two classes of enzymes involving flavin-dependent and flavin-free azoreductases under anaerobic or low oxygen conditions. The second step that is carried out by oxidative enzymes that primarily involves broad specificity peroxidases, laccases and tyrosinases. This review focuses, in particular, on the characterization of these enzymes with respect to their enzyme kinetics and the environmental conditions that are necessary for bioreactor systems to treat azo dyes contained in wastewater.

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Section: Sphingomonas Paucimobilismentioning

confidence: 99%

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Ibekwe

Yang

et al. 2016

Science of The Total Environment

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“…2007a). The dissimilatory azoreduction of S. decolorationis S12 is a process linked to bacterial electron transport chain and has been proved to be a new form of microbial anaerobic respiration (azorespiration) (Hong et al. 2007c, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Shewanella decolorationis S12, previously isolated from activated sludge of a textile-printing wastewater treatment plant in Guangzhou, China (Xu et al 2005), can also effectively reduce azo dyes with many organic substances and hydrogen as electron donors (Hong et al 2007a). The dissimilatory azoreduction of S. decolorationis S12 is a process linked to bacterial electron transport chain and has been proved to be a new form of microbial anaerobic respiration (azorespiration) (Hong et al 2007c(Hong et al , 2009). Further studies have found that the breakdown products of azo dyes can be completely mineralized under microaerophilic or aerobic conditions by S. decolorationis S12 (Hong et al 2007b;Xu et al 2007b).…”

Section: Introductionmentioning

confidence: 99%

Role of iron in azoreduction by resting cells of Shewanella decolorationis S12

Chen

Sun

2010

Journal of Applied Microbiology

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Aim: To investigate the role of soluble and insoluble iron in azoreduction by resting cells of Shewanella decolorationis S12. Methods and Results: A series of analytical experiments were carried out. Results showed that insoluble Fe2O3 all delayed the reduction of amaranth but did not inhibit it. Adsorption to Fe2O3 particles by the bacterial cell surface could be the reason leading to the delay in azoreduction. For the soluble iron, an important finding was that azoreduction activities were inhibited by soluble iron in high concentration because of its higher redox potential, and the inhibition was strengthened when the electron donor supply was insufficient. However, activities of azoreduction could be enhanced by low concentration of soluble iron. This stimulating effect was because of the electron transfer but not the cell growth. Conclusions: The effects of iron on azoreduction by the resting cells depended on the solubility and concentration of the iron compounds, which was different from what was observed by the growing cells in the previous studies. Significance and Impact of the Study: This study has both theoretical significance in the microbial physiology and practical significance in the bioremediation of azo dyes‐contaminated environment.

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“…If membrane vesicles are treated with heat, no azo reduction could be detected. These results show that the membrane fraction contains all of the essential components required for electron transport from the electron donors to the azo compounds resulting in effective azo reduction (Hong et al 2007a , 2009 ).…”

Section: Molecular Components Involved In Bacterial Azo Reductionmentioning

confidence: 93%

“…Experiments using specific inhibitors showed that anaerobic azo reduction both in the bacterial cells in vivo and in the membrane vesicles are inhibited by specific respiratory inhibitors including Cu 2+ ions, dicumarol, stigmatellin, metyrapone, demonstrating that the reduction process is catalyzed by a multi-component system including dehydrogenases, menaquinones, cytochromes and a deduced terminal azo reductase (Hong et al 2007a , 2009 ). Brigé et al ( 2008 ) further identify the molecular components involved in the decolorization process by S. oneidensis MR-1 comprehensively.…”

Section: Molecular Components Involved In Bacterial Azo Reductionmentioning

confidence: 99%

Physiology and biochemistry of reduction of azo compounds by Shewanella strains relevant to electron transport chain

Hong

2010

Appl Microbiol Biotechnol

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Azo dyes are toxic, highly persistent, and ubiquitously distributed in the environments. The large-scale production and application of azo dyes result in serious environmental pollution of water and sediments. Bacterial azo reduction is an important process for removing this group of contaminants. Recent advances in this area of research reveal that azo reduction by Shewanella strains is coupled to the oxidation of electron donors and linked to the electron transport and energy conservation in the cell membrane. Up to date, several key molecular components involved in this reaction have been identified and the primary electron transportation system has been proposed. These new discoveries on the respiration pathways and electron transfer for bacterial azo reduction has potential biotechnological implications in cleaning up contaminated sites.

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Energy Generation Coupled to Azoreduction by Membranous Vesicles from Shewanella decolorationis S12

Cited by 3 publications

References 23 publications

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Bacterial diversity and composition in major fresh produce growing soils affected by physiochemical properties and geographic locations

Role of iron in azoreduction by resting cells of Shewanella decolorationis S12

Physiology and biochemistry of reduction of azo compounds by Shewanella strains relevant to electron transport chain

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