Oxidative Stress, Chromium-Resistance and Uptake by Fungi: Isolated from Industrial Wastewater

Elahi, Amina; Rehman, Abdul

doi:10.1590/1678-4324-2017160394

Cited by 11 publications

(19 citation statements)

References 47 publications

(50 reference statements)

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“…These results also agree with previous reports [25,43,45]. Elahi and Rehman [44] reported that activity of chromate reductase from both T. asahii and R. mucilaginosa was increased in the presence of Na, Ca, Mg, and Co but significantly decreased in the presence of Hg cations.…”

Section: Chromate Reductase Characteristicssupporting

confidence: 93%

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Chromium (VI) tolerance and bioaccumulation by Candida tropicalis isolated from textile wastewater

Ilyas

Bukhari

Rehman

2020

Sustain Environ Res

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In the present study a yeast strain isolated from industrial wastewater, identified as Candida tropicalis, showed chromium (Cr) tolerance level up to 5 mM. Yeast grown in minimal salt medium containing Cr (VI) ions for 48 h and crude enzyme extracts were tested for chromate reductase activity. Optimum temperature and pH of chromate reductase were 30 °C and pH of 7. The enzyme activity was greatly enhanced in the presence of divalent metal cations. Total protein profile revealed some protein bands were present in hexavalent chromium [Cr (VI)] treated samples but were absent in non-treated samples, especially low molecular-weight protein bands in the mass range of < 25 kDa with greater intensity in Cr (VI) treated samples. Yeast cells were able to uptake Cr (VI) between 21 and 80 mg g− 1 within 2–12-d of time, indicating yeast strain promising potential for Cr (VI) removal from the wastewater. The present study results suggest that C. tropicalis is a suitable candidate for bioremediating chromium ions from the contaminated-environment.

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Section: Chromate Reductase Characteristicssupporting

confidence: 93%

“…Among bacterial chromate reductases, the optimal temperature varies in the range of 30-50°C [25,42,43]. Elahi and Rehman [44] reported that optimum chromate reductase activity was achieved at pH 6 (50°C) in Trichosporon asahii while Rhodotorula mucilaginosa showed maximum activity at pH 7 (30°C).…”

Section: Chromate Reductase Characteristicsmentioning

confidence: 99%

Chromium (VI) tolerance and bioaccumulation by Candida tropicalis isolated from textile wastewater

Ilyas

Bukhari

Rehman

2020

Sustain Environ Res

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“…Efficient Cr 6+ biosorption ability was observed in a wide range of fungi groups, i.e., Rhizomucorarrhizu, Aspergillus oryzae, Aspergillus carbonarius, A. niger, Candida tropicalis, Trichoderma sp., Penicillium chrysogenum, and Fusarium oxysporum (Al-Asheh and Duvnjak 1995; Volesky and Holan 1995;Igwe and Abia 2006;Srivastava and Thakur Fig. 3 Growth of Vigna radiata (mung beans) in microbial treated wastewater (with M. testaceum B-HS2), tap water, and untreated wastewater after 10 days of incubation under 1:1 light and dark period indicating that microbially treated wastewater is safe for plant growth (Elahi et al 2019) 2006; Vankar and Bajpai 2007;Ye et al 2010;Amatussalam et al 2011;Rehman and Anjum 2011;Elahi and Rehman 2017).…”

Section: Bioremediation Through Fungimentioning

confidence: 99%

“…Furthermore, they produce various metabolites which also influence metal uptake such as nitrogen-containing ligands, phosphate, and proteins (Bai et al 2012;Chen et al 2012). Elahi and Rehman (2017) reported that Rhodotorula mucilaginosa showed a 0.5-fold increase, whereas Trichosporon asahii exhibited a 0.35-fold increase in chromate reductase activity when compared to the controls. Das and Chandra (1990) working with Cr 6+ Streptomyces sp.…”

Section: Bioremediation Through Fungimentioning

confidence: 99%

Successive use of microorganisms to remove chromium from wastewater

Elahi

Arooj

Bukhari

et al. 2020

Appl Microbiol Biotechnol

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Heavy metal pollution is a direct consequence of the extensive utilization of heavy metals in various industrial processes. The persistence and nondegradability of heavy metals cause them to bioaccumulate in nature, and when they come in direct contact with the pristine environment, they not only contaminate it severely but also pose dire consequences to the health of all living forms on earth, including humans. Chromium (Cr) is one of the heavy metals which has been extensively used in various industrial processes such as mining, alloy manufacturing, tanning of hides and skins, pigment production, etc. However, it is regarded as a priority pollutant due to its highly toxic, teratogenic, mutagenic, and carcinogenic nature, and the U.S. Environmental Protection Agency (EPA) also categorized it into group "A" human carcinogen. In contrast to water-soluble hexavalent chromium (Cr 6+), its reduced form, trivalent chromium (Cr 3+), is relatively benign and readily precipitated at environmental pH. Thus, bioremediation of Cr 6+ through microorganisms including bacteria, yeast, and algae provides a promising approach to decontaminate a metal-polluted environment. This review describes an overview of the microbial reduction of Cr 6+ , resistance mechanism, and the antioxidant profiling exhibited by these microorganisms when exposed to Cr 6+. It also describes the pilot-scale study of the successive use of bacterial, fungal, and algal strains and the subsequent use of microbially purified water for the cultivation of plant growth. Multiple metal-resistant microorganisms are a good bioresource for green chemistry to eradicate environmental Cr 6+. Key Points • Hexavalent chromium (Cr 6+) is highly toxic for living organisms including humans. • Microbial Cr resistance is mediated at the genetic, proteomic, and molecular levels. • Successive use of microorganisms is the best strategy to exterminate Cr 6+ from the environment.

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“…Fungi and yeast species are also valuable sources for production of ChrR enzymes [34][35][36] . A filamentous fungus, Penicillium sp.…”

Section: Chrrs From Microbial Sourcesmentioning

confidence: 99%

Microbial Chromate Reductases: Novel and Potent Mediators in Chromium Bioremediation-A Review

Mala¹,

Takeuchi²,

Mani³

2020

Applied Microbiology: Theory ＆ Technology

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Heavy metal pollution from the growing industrialization are a significant cause of environmental concern.Chromium (Cr) is commonly used in the production of stainless steel, textile dyeing, electroplating, as nuclear coolants and largely in chrome tanning of hides and skins. About 90% of leather is produced by chrome tanning and the leather industry contributes to an overload of Cr toxicity in tannery effluents. Accumulation of Cr6+ is carcinogenic, genotoxic and teratogenic to organisms. Biological methods are ‘green’ approaches for chromium bioremediation and microorganisms are the desired candidates for pollution abatement. Microbial chromate reduction is mediated by chromate reductases (ChrRs) which may be expressed constitutively or inducibly. ChrRs have been produced by a number of bacteria, fungi and yeasts and may be extracellular or localized in the membrane or cytosol. ChrRs are dependent on electron donors such as reduced Nicotinamide adenine dinucleotide (NADH) or reduced Nicotinamide adenine dinucleotide phosphate (NADPH) or reduced Glutathione (GSH) as cofactors. In chromate reduction by ChrRs, Cr6+ undergo one electron transfer to producean unstable Cr5+ radical that is converted to stable and less toxic Cr3+. Putative ChrR genomic sequences have been studied with 99% sequence similarity in Gram negative bacteria. ChrRs are valuable resources in different environments for chromate reduction. This review is to discuss the expression and characteristics of ChrRs and their mechanisms in reduction of Cr6+ toxicity in order to provide a comprehensive understanding of this novel class of enzymes for promisingapplications in Cr bioremediation.

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Oxidative Stress, Chromium-Resistance and Uptake by Fungi: Isolated from Industrial Wastewater

Cited by 11 publications

References 47 publications

Chromium (VI) tolerance and bioaccumulation by Candida tropicalis isolated from textile wastewater

Chromium (VI) tolerance and bioaccumulation by Candida tropicalis isolated from textile wastewater

Successive use of microorganisms to remove chromium from wastewater

Microbial Chromate Reductases: Novel and Potent Mediators in Chromium Bioremediation-A Review

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