Structural basis for expanding the application of bioligand in metal bioremediation: A review

Sharma, Vandana; Pant, Deepak

doi:10.1016/j.biortech.2017.12.070

Cited by 15 publications

(6 citation statements)

References 124 publications

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“…However, even at deficient concentrations, non-essential metals or essential metals at high levels are toxic for microorganisms, and it can be difficult to distinguish between the pathways involved in metabolism and the different strategies that microorganisms employ to deal with heavy metals and metalloids. Microorganisms can adsorb metals, change their speciation to less harmful compounds, and mineralize [65]. Biosorption is mostly carried out by proteins called metallothioneins while speciation is a common reduction mechanism; some examples are Cr 6+ to Cr 3+ , AsO 4 3− to AsO 3 3− , Hg 2+ to Hg 0 [66].…”

Section: Microbial Genes and Enzymes Involved In The Degradation Of Imentioning

confidence: 99%

Functional Analysis of a Polluted River Microbiome Reveals a Metabolic Potential for Bioremediation

et al. 2020

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The objective of this study is to understand the functional and metabolic potential of the microbial communities along the Apatlaco River and highlight activities related to bioremediation and its relationship with the Apatlaco’s pollutants, to enhance future design of more accurate bioremediation processes. Water samples were collected at four sampling sites along the Apatlaco River (S1–S4) and a whole metagenome shotgun sequencing was performed to survey and understand the microbial metabolic functions with potential for bioremediation. A HMMER search was used to detect sequence homologs related to polyethylene terephthalate (PET) and polystyrene biodegradation, along with bacterial metal tolerance in Apatlaco River metagenomes. Our results suggest that pollution is a selective pressure which enriches microorganisms at polluted sites, displaying metabolic capacities to tolerate and transform the contamination. According to KEGG annotation, all sites along the river have bacteria with genes related to xenobiotic biodegradation. In particular, functions such as environmental processing, xenobiotic biodegradation and glycan biosynthesis are over-represented in polluted samples, in comparison to those in the clean water site. This suggests a functional specialization in the communities that inhabit each perturbated point. Our results can contribute to the determination of the partition in a metabolic niche among different Apatlaco River prokaryotic communities, that help to contend with and understand the effect of anthropogenic contamination.

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Section: Microbial Genes and Enzymes Involved In The Degradation Of Imentioning

confidence: 99%

Functional Analysis of a Polluted River Microbiome Reveals a Metabolic Potential for Bioremediation

et al. 2020

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“…Moreover, the inhibition of root Fe(III) reductase induced by Cd led to Fe(II) deficiency, and it seriously affected photosynthesis [38]. Cadmium also changes membrane permeability, leading to a decrease in water content and affecting water balance [39]. Cadmium is a non-essential element; thus, plants have not developed a specialized uptake system for its absorption.…”

Section: Cadmium Impact On Plant Growth and Performancementioning

confidence: 99%

Reducing Cadmium Accumulation in Plants: Structure–Function Relations and Tissue-Specific Operation of Transporters in the Spotlight

Huang

Duan

et al. 2020

Plants

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Cadmium (Cd) is present in many soils and, when entering the food chain, represents a major health threat to humans. Reducing Cd accumulation in plants is complicated by the fact that most known Cd transporters also operate in the transport of essential nutrients such as Zn, Fe, Mn, or Cu. This work summarizes the current knowledge of mechanisms mediating Cd uptake, radial transport, and translocation within the plant. It is concluded that real progress in the field may be only achieved if the transport of Cd and the above beneficial micronutrients is uncoupled, and we discuss the possible ways of achieving this goal. Accordingly, we suggest that the major focus of research in the field should be on the structure–function relations of various transporter isoforms and the functional assessment of their tissue-specific operation. Of specific importance are two tissues. The first one is a xylem parenchyma in plant roots; a major “controller” of Cd loading into the xylem and its transport to the shoot. The second one is a phloem tissue that operates in the last step of a metal transport. Another promising and currently underexplored avenue is to understand the role of non-selective cation channels in Cd uptake and reveal mechanisms of their regulation.

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“…The mutagenesis was done for E.coli K12 and B. subtilis168 in aiming for getting mutants with higher resistance either to cadmium or mercury. Cells at concentrations 6 x10 6 were collected from early stationary phase prior mutation assay. Firstly, to optimise the best time of exposure that kill 90% of cells, cells ( 50 CFU/mL) were irradiated by ultraviolet light distance from light 50 cm for different times of vulnerability and colonyforming units were counted after growing in nutrient agar medium.…”

Section: Mutagenesismentioning

confidence: 99%

“…Bacteria have a detoxification system of transport Hg (II) into cellular space to reduce it into Hg (0) by volatilisation (5). All these mechanisms, either for cadmium or mercury bioremediation, depend on the resistance ability of bacteria as higher resistance to metal leading to increase the process and the efficiency of removal (6). Thus, the resistance ability of bacteria is one of the most biotechnological approaches in the bioremediation process.…”

mentioning

confidence: 99%

In Vitro Bioremediation: A Development Process of Cadmium and Mercury Removal by Environmental Biotechnologies of UV-Mutated Escherichia coli K12 and Bacillus subtilis 168

Jebril¹

2020

Baghdad Sci.J

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coli K12 and B. subtilis 168 were investigated for their cadmium and mercury tolerance abilities. They were developed by UV mutagenesis technique to increase their tolerances either to cadmium or mercury, and their names then were designated depend on the name and concentration of metals. E. coli K12 Cd3R exhibited bioremediation amount of 6.5 mg Cd/g dry biomass cell. At the same time, its wild-type (E. coli K12 Cd3) was able to remove 5.2 mg Cd/g dry biomass cell in treatment of 17 mg Cd /L within 72 hours of incubation at 37 °C (pH=7) in vitro assays. The results show that E.coli K12 Hg 20 was able to remove 0.050 µg Hg/g dry biomass cell and more removal by its mutant E.coli K12 Hg 20R to 0.060 µg Hg/ g dry biomass cell in the treatment of 0.15 µg Hg /L. On the other hand, B. subtilis168 Cd2 was able to remove the least amount of cadmium (5 mg Cd/ g dry biomass cell) and of mercury (0.045 µg Hg/ g dry biomass cell) under the same conditions were used for E. coli K12. Also, the complete removal of both metals was confirmed by scanning electron microscopy (SEM) showing that the effect of cadmium and mercury on the bacterial mass. Also, the SEM images showed that the removal amounts had relationships in changing the morphology of cells under in vitroassays.

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Structural basis for expanding the application of bioligand in metal bioremediation: A review

Cited by 15 publications

References 124 publications

Functional Analysis of a Polluted River Microbiome Reveals a Metabolic Potential for Bioremediation

Functional Analysis of a Polluted River Microbiome Reveals a Metabolic Potential for Bioremediation

Reducing Cadmium Accumulation in Plants: Structure–Function Relations and Tissue-Specific Operation of Transporters in the Spotlight

In Vitro Bioremediation: A Development Process of Cadmium and Mercury Removal by Environmental Biotechnologies of UV-Mutated Escherichia coli K12 and Bacillus subtilis 168

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