Biotransformation of chromium by root nodule bacteria Sinorhizobium sp. SAR1

Jobby, Renitta; Jha, Pamela; Gupta, A. K.; Gupte, Arpita; Desai, Neetin

doi:10.1371/journal.pone.0219387

Cited by 36 publications

(10 citation statements)

References 40 publications

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“…A similar situation has been observed with root nodule bacterium Sinorhizobium sp. SAR1 that tolerated Cr concentrations up to 1 mM due to the production of exopolymers [ 150 ].…”

Section: Biogenic Chromium Mineralsmentioning

confidence: 99%

Forced Biomineralization: A Review

2021

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Biologically induced and controlled mineralization of metals promotes the development of protective structures to shield cells from thermal, chemical, and ultraviolet stresses. Metal biomineralization is widely considered to have been relevant for the survival of life in the environmental conditions of ancient terrestrial oceans. Similar behavior is seen among extremophilic biomineralizers today, which have evolved to inhabit a variety of industrial aqueous environments with elevated metal concentrations. As an example of extreme biomineralization, we introduce the category of “forced biomineralization”, which we use to refer to the biologically mediated sequestration of dissolved metals and metalloids into minerals. We discuss forced mineralization as it is known to be carried out by a variety of organisms, including polyextremophiles in a range of psychrophilic, thermophilic, anaerobic, alkaliphilic, acidophilic, and halophilic conditions, as well as in environments with very high or toxic metal ion concentrations. While much additional work lies ahead to characterize the various pathways by which these biominerals form, forced biomineralization has been shown to provide insights for the progression of extreme biomimetics, allowing for promising new forays into creating the next generation of composites using organic-templating approaches under biologically extreme laboratory conditions relevant to a wide range of industrial conditions.

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“…A similar situation has been observed with root nodule bacterium Sinorhizobium sp. SAR1 that tolerated Cr concentrations up to 1 mM due to the production of exopolymers [ 150 ].…”

Section: Biogenic Chromium Mineralsmentioning

confidence: 99%

Forced Biomineralization: A Review

2021

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“…At higher concentrations, more chromium ions are left unabsorbed in the solution due to the saturation of binding sites [110]. e study done by [142] confirms that an increase in metal concentration, from 100 mg/L to 500 mg/L, led to a decrease in percentage Cr(VI) removal (from 99.88% to 83.69%). But analysis of total Cr showed that uptake capacity of the biosorbent SAR1 increased (6.27 mg/g to 28.95 mg/g) with an increase in Cr(VI) concentration.…”

Section: E Influence Of Initial Metal Ion Concentrationmentioning

confidence: 78%

Bioremediation of Chromium by Microorganisms and Its Mechanisms Related to Functional Groups

Ayele

Godeto

2021

Journal of Chemistry

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Heavy metals generated mainly through many anthropogenic processes, and some natural processes have been a great environmental challenge and continued to be the concern of many researchers and environmental scientists. This is mainly due to their highest toxicity even at a minimum concentration as they are nonbiodegradable and can persist in the aquatic and terrestrial environments for long periods. Chromium ions, especially hexavalent ions (Cr(VI)) generated through the different industrial process such as tanneries, metallurgical, petroleum, refractory, oil well drilling, electroplating, mining, textile, pulp and paper industries, are among toxic heavy metal ions, which pose toxic effects to human, plants, microorganisms, and aquatic lives. This review work is aimed at biosorption of hexavalent chromium (Cr(VI)) through microbial biomass, mainly bacteria, fungi, and microalgae, factors influencing the biosorption of chromium by microorganisms and the mechanism involved in the remediation process and the functional groups participated in the uptake of toxic Cr(VI) from contaminated environments by biosorbents. The biosorption process is relatively more advantageous over conventional remediation technique as it is rapid, economical, requires minimal preparatory steps, efficient, needs no toxic chemicals, and allows regeneration of biosorbent at the end of the process. Also, the presence of multiple functional groups in microbial cell surfaces and more active binding sites allow easy uptake and binding of a greater number of toxic heavy metal ions from polluted samples. This could be useful in creating new insights into the development and advancement of future technologies for future research on the bioremediation of toxic heavy metals at the industrial scale.

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“…Similarly, Jobby et al [48] suggested that the stretch at 1288, 1238, and 1220 cm −1 could be due to the production of exopolysaccharides by aromatic esters under Cr stress conditions.…”

Section: Ftir Raman Spectroscopy and Tem-edx Analysis On The Rhizobac...mentioning

confidence: 92%

“…Our study is in line with the previous reports demonstrated using Methylococcus capsulatus [57], Escherichia coli K-12 [58], Sinorhizobium sp. [48], and Bacillus sp. M6 [59] for intracellular Cr accumulation.…”

Section: Ftir Raman Spectroscopy and Tem-edx Analysis On The Rhizobac...mentioning

confidence: 99%

“…Agronomy 2022, 12, x FOR PEER REVIEW 11 of 24 et al [48] suggested that the stretch at 1288, 1238, and 1220 cm −1 could be due to the production of exopolysaccharides by aromatic esters under Cr stress conditions. In general, Cr binds with bacterial cell surface through various functional groups such as alkanes, hydroxyl, carboxyl, amines, amide, sulfonate, phosphonate, imidazole, carbonyl, and phosphodiester, which are actively involved in Cr binding and adsorption.…”

Section: Ftir Raman Spectroscopy and Tem-edx Analysis On The Rhizobac...mentioning

confidence: 99%

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Alleviation of Cr(VI) Toxicity and Improve Phytostabilization Potential of Vigna radiata Using a Novel Cr(VI) Reducing Multi-Stress-Tolerant Plant Growth Promoting Rhizobacterial Strain Bacillus flexus M2

et al. 2022

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Chromium (Cr) is a toxic heavy metal discharged into the environment through various anthropogenic sources, which affects soil properties and fertility. Hence, an effective soil restoration strategy is the need of the hour. In this study, a potent Cr(VI)-reducing strain M2 was isolated from the rhizosphere of Zea mays L. grown in leather industrial effluent contaminated sites and identified as Bacillus flexus through 16S rDNA sequencing. Strain M2 exhibited strong tolerance to multi-stresses such as temperature (up to 45 °C), pH (up to 9.0), Sodium chloride (NaCl) (up to 7%) and PEG 6000 (up to 50%) and showed strong Cr(VI) reduction with the presence of multi-stresses. The interaction of Cr(VI) with strain M2 was elucidated through various instrumentation analyses. Fourier Transform Infra-red (FTIR) Spectroscopy analysis confirmed that Cr(VI) exposures induce significant changes in the cell-surface functional groups. Raman spectrum and Transmission Electron Microscopy–Energy Dispersive X-ray spectroscopy (TEM-EDX) analysis confirmed the bio-reduction of Cr(VI) to Cr(III) and their intracellular localization as Cr(III). Further, strain M2 produced a significant quantity of Indole acetic acid (IAA), ammonia, and exopolysaccharide (EPS) and showed positive results for various plant-growth-promoting activities with the presence of Cr(VI). In greenhouse experiments, the strain M2 inoculation progressively increased the plant growth parameters and stabilized the antioxidant system of Vigna radiata under Cr stress. However, Cr(VI) exposure decreased the growth parameters and increased the level of proline content, Hydrogen peroxide (H2O2) accumulation, and antioxidant enzymes expression in V. radiata. Interestingly, strain M2 inoculation significantly reduced the accumulation of Cr in root and shoot of V. radiata when compared to the uninoculated Cr(VI) treatment. Hence, this study confirms that rhizobacterial inoculation markedly reduced the negative impact of Cr toxicity and improved V. radiata growth even in harsh environments by stabilizing the mobility of Cr in the rhizosphere.

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Biotransformation of chromium by root nodule bacteria Sinorhizobium sp. SAR1

Cited by 36 publications

References 40 publications

Forced Biomineralization: A Review

Forced Biomineralization: A Review

Bioremediation of Chromium by Microorganisms and Its Mechanisms Related to Functional Groups

Alleviation of Cr(VI) Toxicity and Improve Phytostabilization Potential of Vigna radiata Using a Novel Cr(VI) Reducing Multi-Stress-Tolerant Plant Growth Promoting Rhizobacterial Strain Bacillus flexus M2

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