Catalytic oxidation of manganese(II) by multicopper oxidase CueO and characterization of the biogenic Mn oxide

Su, Jianmei; Deng, Lin; Huang, Liangbo; Guo, Shujin; Fan, Liangdong; He, Jin

doi:10.1016/j.watres.2014.03.013

Cited by 80 publications

(36 citation statements)

References 44 publications

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“…They have been identified in Pseudomonas putida (10), Bacillus species (11,12), Leptothrix discophora (13), and Pedomicrobium (14). Recently, two of the bacterial Mn-oxidizing MCO enzymes from Bacillus species (15,16) and an MCO, CueO, from Escherichia coli (17) have been heterologously expressed, purified, and biochemically characterized. These unique MCO enzymes oxidize Mn(II) by two one-electron transfers to form an Mn(IV) oxide.…”

mentioning

confidence: 99%

Heterologous Expression and Characterization of the Manganese-Oxidizing Protein from Erythrobacter sp. Strain SD21

Nakama

Medina

Lien

et al. 2014

Appl Environ Microbiol

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The manganese (Mn)-oxidizing protein (MopA) from Erythrobacter sp. strain SD21 is part of a unique enzymatic family that is capable of oxidizing soluble Mn(II). This enzyme contains two domains, an animal heme peroxidase domain, which contains the catalytic site, followed by a C-terminal calcium binding domain. Different from the bacterial Mn-oxidizing multicopper oxidase enzymes, little is known about MopA. To gain a better understanding of MopA and its role in Mn(II) oxidation, the 238-kDa fulllength protein and a 105-kDa truncated protein containing only the animal heme peroxidase domain were cloned and heterologously expressed in Escherichia coli. Despite having sequence similarity to a peroxidase, hydrogen peroxide did not stimulate activity, nor was activity significantly decreased in the presence of catalase. Both pyrroloquinoline quinone (PQQ) and hemin increased Mn-oxidizing activity, and calcium was required. The K m for Mn(II) of the full-length protein in cell extract was similar to that of the natively expressed protein, but the K m value for the truncated protein in cell extract was approximately 6-fold higher than that of the full-length protein, suggesting that the calcium binding domain may aid in binding Mn(II). Characterization of the heterologously expressed MopA has provided additional insight into the mechanism of bacterial Mn(II) oxidation, which will aid in understanding the role of MopA and Mn oxidation in bioremediation and biogeochemical cycling.

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confidence: 99%

Heterologous Expression and Characterization of the Manganese-Oxidizing Protein from Erythrobacter sp. Strain SD21

Nakama

Medina

Lien

et al. 2014

Appl Environ Microbiol

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“…In the literature, biological oxidation and removal capacities of Mn(II) from solution are reported extensively [73,[75][76][77][78][79][80][81][82][83][84][85][86][87][88][89] (Table 4). Biological removal of Mn has mainly been applied to the remediation of groundwater and artificial wastewater systems.…”

Section: Biological Treatment Of Mn(ii)mentioning

confidence: 99%

Removal of Manganese(II) from Acid Mine Wastewater: A Review of the Challenges and Opportunities with Special Emphasis on Mn-Oxidizing Bacteria and Microalgae

et al. 2019

Water

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Many global mining activities release large amounts of acidic mine drainage with high levels of manganese (Mn) having potentially detrimental effects on the environment. This review provides a comprehensive assessment of the main implications and challenges of Mn(II) removal from mine drainage. We first present the sources of contamination from mineral processing, as well as the adverse effects of Mn on mining ecosystems. Then the comparison of several techniques to remove Mn(II) from wastewater, as well as an assessment of the challenges associated with precipitation, adsorption, and oxidation/filtration are provided. We also critically analyze remediation options with special emphasis on Mn-oxidizing bacteria (MnOB) and microalgae. Recent literature demonstrates that MnOB can efficiently oxidize dissolved Mn(II) to Mn(III, IV) through enzymatic catalysis. Microalgae can also accelerate Mn(II) oxidation through indirect oxidation by increasing solution pH and dissolved oxygen production during its growth. Microbial oxidation and the removal of Mn(II) have been effective in treating artificial wastewater and groundwater under neutral conditions with adequate oxygen. Compared to physicochemical techniques, the bioremediation of manganese mine drainage without the addition of chemical reagents is relatively inexpensive. However, wastewater from manganese mines is acidic and has low-levels of dissolved oxygen, which inhibit the oxidizing ability of MnOB. We propose an alternative treatment for manganese mine drainage that focuses on the synergistic interactions of Mn in wastewater with co-immobilized MnOB/microalgae.

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“…Mn(II) can adsorb to negatively charged extracellular polymer substances (EPS) [52]. Biogenic oxides such as γ-Mn 3 O 4 that are generated from bacterial catalytic reactions can also adsorb Mn(II) [55]. The third mechanism is catalysis of Mn(II) oxidation by biopolymers generated by microorganisms [52].…”

Section: Biological Removal Of Manganesementioning

confidence: 99%

Manganese Removal from Drinking Water Sources

et al. 2016

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Manganese (Mn) in drinking water can cause aesthetic and operational problems. Mn removal is necessary and often has major implications for treatment train design. This review provides an introduction to Mn occurrence and summarizes historic and recent research on removal mechanisms practiced in drinking water treatment. Manganese is removed by physical, chemical, and biological processes or by a combination of these methods. Although physical and chemical removal processes have been studied for decades, knowledge gaps still exist. The discovery of undesirable by-products when certain oxidants are used in treatment has impacted physical-chemical Mn removal methods. Understanding of the microorganisms present in systems that practice biological Mn removal has increased in the last decade as molecular methods have become more sophisticated, resulting in increasing use of biofiltration for Mn removal. The choice of Mn removal method is very much impacted by overall water chemistry and co-contaminants and must be integrated into the overall water treatment facility design and operation.

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Catalytic oxidation of manganese(II) by multicopper oxidase CueO and characterization of the biogenic Mn oxide

Cited by 80 publications

References 44 publications

Heterologous Expression and Characterization of the Manganese-Oxidizing Protein from Erythrobacter sp. Strain SD21

Heterologous Expression and Characterization of the Manganese-Oxidizing Protein from Erythrobacter sp. Strain SD21

Removal of Manganese(II) from Acid Mine Wastewater: A Review of the Challenges and Opportunities with Special Emphasis on Mn-Oxidizing Bacteria and Microalgae

Manganese Removal from Drinking Water Sources

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