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Mo W, Wang H, Wang J, Wang Y, Liu Y, Luo Y, He M, Cheng S, Mei H, He J, Su J. Advances in Research on Bacterial Oxidation of Mn(II): A Visualized Bibliometric Analysis Based on CiteSpace. Microorganisms 2024; 12:1611. [PMID: 39203453 PMCID: PMC11356483 DOI: 10.3390/microorganisms12081611] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2024] [Revised: 08/03/2024] [Accepted: 08/05/2024] [Indexed: 09/03/2024] Open
Abstract
Manganese (Mn) pollution poses a serious threat to the health of animals, plants, and humans. The microbial-mediated Mn(II) removal method has received widespread attention because of its rapid growth, high efficiency, and economy. Mn(II)-oxidizing bacteria can oxidize toxic soluble Mn(II) into non-toxic Mn(III/IV) oxides, which can further participate in the transformation of other heavy metals and organic pollutants, playing a crucial role in environmental remediation. This study aims to conduct a bibliometric analysis of research papers on bacterial Mn(II) oxidation using CiteSpace, and to explore the research hotspots and developmental trends within this field between 2008 and 2023. A series of visualized knowledge map analyses were conducted with 469 screened SCI research papers regarding annual publication quantity, author groups and their countries and regions, journal categories, publishing institutions, and keywords. China, the USA, and Japan published the most significant number of research papers on the research of bacterial Mn(II) oxidation. Research hotspots of bacterial Mn(II) oxidation mainly focused on the species and distributions of Mn(II)-oxidizing bacteria, the influencing factors of Mn(II) oxidation, the mechanisms of Mn(II) oxidation, and their applications in environment. This bibliometric analysis provides a comprehensive visualized knowledge map to quickly understand the current advancements, research hotspots, and academic frontiers in bacterial Mn(II) oxidation.
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Affiliation(s)
- Wentao Mo
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Hang Wang
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Jianghan Wang
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Yue Wang
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Yunfei Liu
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Yi Luo
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Minghui He
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Shuang Cheng
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Huiting Mei
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
| | - Jin He
- National Key Laboratory of Agricultural Microbiology, College of Life Science and Technology, Huazhong Agricultural University, Wuhan 430062, China;
| | - Jianmei Su
- Hubei Key Laboratory of Regional Development and Environmental Response, Faculty of Resources and Environmental Science, Hubei University, Wuhan 430062, China; (W.M.); (H.W.); (J.W.); (Y.W.); (Y.L.); (Y.L.); (M.H.); (S.C.); (H.M.)
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Rossotti M, Arceri D, Mansuelle P, Bornet O, Durand A, Ouchane S, Launay H, Dorlet P. The green cupredoxin CopI is a multicopper protein able to oxidize Cu(I). J Inorg Biochem 2024; 254:112503. [PMID: 38364337 DOI: 10.1016/j.jinorgbio.2024.112503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2023] [Revised: 02/02/2024] [Accepted: 02/06/2024] [Indexed: 02/18/2024]
Abstract
Anthropogenic activities in agriculture and health use the antimicrobial properties of copper. This has led to copper accumulation in the environment and contributed to the emergence of copper resistant microorganisms. Understanding bacterial copper homeostasis diversity is therefore highly relevant since it could provide valuable targets for novel antimicrobial treatments. The periplasmic CopI protein is a monodomain cupredoxin comprising several copper binding sites and is directly involved in copper resistance in bacteria. However, its structure and mechanism of action are yet to be determined. To study the different binding sites for cupric and cuprous ions and to understand their possible interactions, we have used mutants of the putative copper binding modules of CopI and spectroscopic methods to characterize their properties. We show that CopI is able to bind a cuprous ion in its central histidine/methionine-rich region and oxidize it thanks to its cupredoxin center. The resulting cupric ion can bind to a third site at the N-terminus of the protein. Nuclear magnetic resonance spectroscopy revealed that the central histidine/methionine-rich region exhibits a dynamic behavior and interacts with the cupredoxin binding region. CopI is therefore likely to participate in copper resistance by detoxifying the cuprous ions from the periplasm.
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Affiliation(s)
- Melanie Rossotti
- CNRS, Aix Marseille Univ, BIP, Institut de Microbiologie de la Méditerranée (IMM), Marseille, France
| | - Diletta Arceri
- CNRS, Aix Marseille Univ, BIP, Institut de Microbiologie de la Méditerranée (IMM), Marseille, France
| | - Pascal Mansuelle
- CNRS, FR3479, Institut de Microbiologie de la Méditerranée (IMM), Plateforme Protéomique, Marseille Protéomique (MaP), IbiSA Labelled, Aix Marseille Univ, Marseille, France
| | - Olivier Bornet
- CNRS, Aix Marseille Univ, Institut de Microbiologie de la Méditerranée (IMM), Marseille, France
| | - Anne Durand
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Soufian Ouchane
- Université Paris-Saclay, CEA, CNRS, Institute for Integrative Biology of the Cell (I2BC), Gif-sur-Yvette, France
| | - Hélène Launay
- CNRS, Aix Marseille Univ, BIP, Institut de Microbiologie de la Méditerranée (IMM), Marseille, France
| | - Pierre Dorlet
- CNRS, Aix Marseille Univ, BIP, Institut de Microbiologie de la Méditerranée (IMM), Marseille, France.
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Morobane DM, Tshishonga K, Serepa-Dlamini MH. Draft Genome Sequence of Pantoea sp. Strain MHSD4, a Bacterial Endophyte With Bioremediation Potential. Evol Bioinform Online 2024; 20:11769343231217908. [PMID: 38487815 PMCID: PMC10938601 DOI: 10.1177/11769343231217908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Accepted: 11/14/2023] [Indexed: 03/17/2024] Open
Abstract
Pantoea sp. strain MHSD4 is a bacterial endophyte isolated from the leaves of the medicinal plant Pellaea calomelanos. Here, we report on strain MHSD4 draft whole genome sequence and annotation. The draft genome size of Pantoea sp. strain MHSD4 is 4 647 677 bp with a G+C content of 54.2% and 41 contigs. The National Center for Biotechnology Information Prokaryotic Genome Annotation Pipeline tool predicted a total of 4395 genes inclusive of 4235 protein-coding genes, 87 total RNA genes, 14 non-coding (nc) RNAs and 70 tRNAs, and 73 pseudogenes. Biosynthesis pathways for naphthalene and anthracene degradation were identified. Putative genes involved in bioremediation such as copA, copD, cueO, cueR, glnGm, and trxC were identified. Putative genes involved in copper homeostasis and tolerance were identified which may suggest that Pantoea sp. strain MHSD4 has biotechnological potential for bioremediation of heavy metals.
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Affiliation(s)
- Dimpho Michelle Morobane
- Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, Doornfontein Campus, Doornfontein, Johannesburg, South Africa
| | - Khuthadzo Tshishonga
- Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, Doornfontein Campus, Doornfontein, Johannesburg, South Africa
| | - Mahloro Hope Serepa-Dlamini
- Department of Biotechnology and Food Technology, Faculty of Science, University of Johannesburg, Doornfontein Campus, Doornfontein, Johannesburg, South Africa
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Miano A, Rychel K, Lezia A, Sastry A, Palsson B, Hasty J. High-resolution temporal profiling of E. coli transcriptional response. Nat Commun 2023; 14:7606. [PMID: 37993418 PMCID: PMC10665441 DOI: 10.1038/s41467-023-43173-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Accepted: 11/02/2023] [Indexed: 11/24/2023] Open
Abstract
Understanding how cells dynamically adapt to their environment is a primary focus of biology research. Temporal information about cellular behavior is often limited by both small numbers of data time-points and the methods used to analyze this data. Here, we apply unsupervised machine learning to a data set containing the activity of 1805 native promoters in E. coli measured every 10 minutes in a high-throughput microfluidic device via fluorescence time-lapse microscopy. Specifically, this data set reveals E. coli transcriptome dynamics when exposed to different heavy metal ions. We use a bioinformatics pipeline based on Independent Component Analysis (ICA) to generate insights and hypotheses from this data. We discovered three primary, time-dependent stages of promoter activation to heavy metal stress (fast, intermediate, and steady). Furthermore, we uncovered a global strategy E. coli uses to reallocate resources from stress-related promoters to growth-related promoters following exposure to heavy metal stress.
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Affiliation(s)
- Arianna Miano
- Department of Bioengineering, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA.
| | - Kevin Rychel
- Department of Bioengineering, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA
| | - Andrew Lezia
- Department of Bioengineering, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA
| | - Anand Sastry
- Department of Bioengineering, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA
| | - Bernhard Palsson
- Department of Bioengineering, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA
- Novo Nordisk Foundation Center for Biosustainability, Technical University of Denmark, Kemitorvet, Building 220, 2800 Kgs, Lyngby, Denmark
| | - Jeff Hasty
- Department of Bioengineering, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA
- Department of Molecular Biology, School of Biological Sciences, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA
- Synthetic Biology Institute, University of California San Diego, 9500 Gliman Dr, La Jolla, CA, USA
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Salam LB, Obayori OS, Ilori MO, Amund OO. Chromium contamination accentuates changes in the microbiome and heavy metal resistome of a tropical agricultural soil. World J Microbiol Biotechnol 2023; 39:228. [PMID: 37338635 DOI: 10.1007/s11274-023-03681-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 06/15/2023] [Indexed: 06/21/2023]
Abstract
The impacts of hexavalent chromium (Cr) contamination on the microbiome, soil physicochemistry, and heavy metal resistome of a tropical agricultural soil were evaluated for 6 weeks in field-moist microcosms consisting of a Cr-inundated agricultural soil (SL9) and an untreated control (SL7). The physicochemistry of the two microcosms revealed a diminution in the total organic matter content and a significant dip in macronutrients phosphorus, potassium, and nitrogen concentration in the SL9 microcosm. Heavy metals analysis revealed the detection of seven heavy metals (Zn, Cu, Fe, Cd, Se, Pb, Cr) in the agricultural soil (SL7), whose concentrations drastically reduced in the SL9 microcosm. Illumina shotgun sequencing of the DNA extracted from the two microcosms showed the preponderance of the phyla, classes, genera, and species of Actinobacteria (33.11%), Actinobacteria_class (38.20%), Candidatus Saccharimonas (11.67%), and Candidatus Saccharimonas aalborgensis (19.70%) in SL7, and Proteobacteria (47.52%), Betaproteobacteria (22.88%), Staphylococcus (16.18%), Staphylococcus aureus (9.76%) in SL9, respectively. Functional annotation of the two metagenomes for heavy metal resistance genes revealed diverse heavy metal resistomes involved in the uptake, transport, efflux, and detoxification of various heavy metals. It also revealed the exclusive detection in SL9 metagenome of resistance genes for chromium (chrB, chrF, chrR, nfsA, yieF), cadmium (czcB/czrB, czcD), and iron (fbpB, yqjH, rcnA, fetB, bfrA, fecE) not annotated in SL7 metagenome. The findings from this study revealed that Cr contamination induces significant shifts in the soil microbiome and heavy metal resistome, alters the soil physicochemistry, and facilitates the loss of prominent members of the microbiome not adapted to Cr stress.
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Affiliation(s)
- Lateef Babatunde Salam
- Department of Biological Sciences, Microbiology unit, Elizade University, Ilara-Mokin, Ondo State, Nigeria.
| | | | - Matthew O Ilori
- Department of Microbiology, University of Lagos, Akoka, Lagos, Nigeria
| | - Olukayode O Amund
- Department of Microbiology, University of Lagos, Akoka, Lagos, Nigeria
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Complete Genome Sequencing of Polar Arthrobacter sp. PAMC25284, Copper Tolerance Potential Unraveled with Genomic Analysis. Int J Microbiol 2022; 2022:1162938. [PMID: 36061879 PMCID: PMC9436591 DOI: 10.1155/2022/1162938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2022] [Revised: 06/15/2022] [Accepted: 06/28/2022] [Indexed: 11/25/2022] Open
Abstract
The genus Arthrobacter is a known group of Gram-positive, opportunistic pathogenic bacteria from cold climates, with members that are believed to play a variety of roles at low temperatures. However, their survival mechanisms in frigid environments like the Antarctic are still unknown. We identified a species of Arthrobacter isolated from seawater in the polar region using 16S rRNA sequence analysis. The strain PAMC25284 genome consists of a circular chromosome with a GC content of 65.6% and is projected to contain 3,588 genes, of which 3,150 are protein coding, 366 are pseudogenes, 19 are rRNA coding, and 50 are tRNA coding genes. Using comparative genomics, we showed that PMAC25284 has copper-transporting ATPases, copper chaperone, copper-responsive transcriptional regulator, and multi-copper oxidase domains, which are found in both Gram-positive (like Mycobacterium tuberculosis and Enterococcus hirae) and Gram-negative bacteria (like E. coli and Pseudomonas aeruginosa). The existence of 4 multi-copper oxidase genes, which supplied an additional copper defense mechanism, could be intriguing information regarding Gram-positive bacteria such as Arthrobacter sp. PAMC25284. In addition, our strain PAMC25284 has the same MmcO gene as M. tuberculosis, with a locus tag KY499_RS04055 similarity of 40.61%, which is the highest among the Gram-positive and Gram-negative bacteria studied for this gene. Our cold-adapted Arthrobacter sp. strain PAMC25564 was published previously but did not contain a multi-copper oxidase domain-containing gene, but strain PAMC25284 was studied in this study.
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Vergnes A, Henry C, Grassini G, Loiseau L, El Hajj S, Denis Y, Galinier A, Vertommen D, Aussel L, Ezraty B. Periplasmic oxidized-protein repair during copper stress in E. coli: A focus on the metallochaperone CusF. PLoS Genet 2022; 18:e1010180. [PMID: 35816552 PMCID: PMC9302797 DOI: 10.1371/journal.pgen.1010180] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2022] [Revised: 07/21/2022] [Accepted: 06/09/2022] [Indexed: 11/18/2022] Open
Abstract
Methionine residues are particularly sensitive to oxidation by reactive oxygen or chlorine species (ROS/RCS), leading to the appearance of methionine sulfoxide in proteins. This post-translational oxidation can be reversed by omnipresent protein repair pathways involving methionine sulfoxide reductases (Msr). In the periplasm of Escherichia coli, the enzymatic system MsrPQ, whose expression is triggered by the RCS, controls the redox status of methionine residues. Here we report that MsrPQ synthesis is also induced by copper stress via the CusSR two-component system, and that MsrPQ plays a role in copper homeostasis by maintaining the activity of the copper efflux pump, CusCFBA. Genetic and biochemical evidence suggest the metallochaperone CusF is the substrate of MsrPQ and our study reveals that CusF methionines are redox sensitive and can be restored by MsrPQ. Thus, the evolution of a CusSR-dependent synthesis of MsrPQ allows conservation of copper homeostasis under aerobic conditions by maintenance of the reduced state of Met residues in copper-trafficking proteins.
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Affiliation(s)
- Alexandra Vergnes
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Camille Henry
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Gaia Grassini
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Laurent Loiseau
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Sara El Hajj
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Yann Denis
- Institut de Microbiologie de la Méditerranée, Plate-forme Transcriptomique, Marseille, France
| | - Anne Galinier
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Didier Vertommen
- de Duve Institute, MASSPROT Platform, Université Catholique de Louvain, Brussels, Belgium
| | - Laurent Aussel
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
| | - Benjamin Ezraty
- Aix-Marseille University, CNRS, Laboratoire de Chimie Bactérienne, Institut de Microbiologie de la Méditerranée, Marseille, France
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Xiong D, Wen J, Lu G, Li T, Long M. Isolation, Purification, and Characterization of a Laccase-Degrading Aflatoxin B1 from Bacillus amyloliquefaciens B10. Toxins (Basel) 2022; 14:toxins14040250. [PMID: 35448859 PMCID: PMC9028405 DOI: 10.3390/toxins14040250] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2022] [Revised: 03/29/2022] [Accepted: 03/29/2022] [Indexed: 01/27/2023] Open
Abstract
Aflatoxins, widely found in feed and foodstuffs, are potentially harmful to human and animal health because of their high toxicity. In this study, a strain of Bacillus amyloliquefaciens B10 with a strong ability to degrade aflatoxin B1 (AFB1) was screened; it could degrade 2.5 μg/mL of AFB1 within 96 h. The active substances of Bacillus amyloliquefaciens B10 for the degradation of AFB1 mainly existed in the culture supernatant. A new laccase with AFB1-degrading activity was separated by ammonium sulfate precipitation, diethylaminoethyl (DEAE) and gel filtration chromatography. The results of molecular docking showed that B10 laccase and aflatoxin had a high docking score. The coding sequence of the laccase was successfully amplified from cDNA by PCR and cloned into E. coli. The purified laccase could degrade 79.3% of AFB1 within 36 h. The optimum temperature for AFB1 degradation was 40 °C, and the optimum pH was 6.0–8.0. Notably, Mg2+ and dimethyl sulfoxide (DMSO) could enhance the AFB1-degrading activity of B10 laccase. Mutation of the three key metal combined sites of B10 laccase resulted in the loss of AFB1-degrading activity, indicating that these three metal combined sites of B10 laccase play an essential role in the catalytic degradation of AFB1.
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Virieux-Petit M, Hammer-Dedet F, Aujoulat F, Jumas-Bilak E, Romano-Bertrand S. From Copper Tolerance to Resistance in Pseudomonas aeruginosa towards Patho-Adaptation and Hospital Success. Genes (Basel) 2022; 13:genes13020301. [PMID: 35205346 PMCID: PMC8872213 DOI: 10.3390/genes13020301] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 01/27/2022] [Accepted: 02/01/2022] [Indexed: 02/01/2023] Open
Abstract
The hospital environment constitutes a reservoir of opportunistic pathogens responsible for healthcare-associated infections (HCAI) such as Pseudomonas aeruginosa (Pa). Pa persistence within technological niches, the increasing emergence of epidemic high-risk clones in HCAI, the epidemiological link between plumbing strains and clinical strains, make it a major nosocomial pathogen. Therefore, understanding the mechanisms of Pa adaptation to hospital water systems would be useful in preventing HCAI. This review deciphers how copper resistance contributes to Pa adaptation and persistence in a hospital environment, especially within copper water systems, and ultimately to its success as a causative agent of HCAI. Numerous factors are involved in copper homeostasis in Pa, among which active efflux conferring copper tolerance, and copper-binding proteins regulating the copper compartmentalization between periplasm and cytoplasm. The functional harmony of copper homeostasis is regulated by several transcriptional regulators. The genomic island GI-7 appeared as especially responsible for the copper resistance in Pa. Mechanisms of copper and antibiotic cross-resistance and co-resistance are also identified, with potential co-regulation processes between them. Finally, copper resistance of Pa confers selective advantages in colonizing and persisting in hospital environments but also appears as an asset at the host/pathogen interface that helps in HCAI occurrence.
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Affiliation(s)
- Maxine Virieux-Petit
- HydroSciences Montpellier, IRD, CNRS, Montpellier University, 34093 Montpellier, France; (M.V.-P.); (F.H.-D.); (F.A.); (E.J.-B.)
| | - Florence Hammer-Dedet
- HydroSciences Montpellier, IRD, CNRS, Montpellier University, 34093 Montpellier, France; (M.V.-P.); (F.H.-D.); (F.A.); (E.J.-B.)
| | - Fabien Aujoulat
- HydroSciences Montpellier, IRD, CNRS, Montpellier University, 34093 Montpellier, France; (M.V.-P.); (F.H.-D.); (F.A.); (E.J.-B.)
| | - Estelle Jumas-Bilak
- HydroSciences Montpellier, IRD, CNRS, Montpellier University, 34093 Montpellier, France; (M.V.-P.); (F.H.-D.); (F.A.); (E.J.-B.)
- Hospital Hygiene and Infection Control Team, University Hospital of Montpellier, 34093 Montpellier, France
| | - Sara Romano-Bertrand
- HydroSciences Montpellier, IRD, CNRS, Montpellier University, 34093 Montpellier, France; (M.V.-P.); (F.H.-D.); (F.A.); (E.J.-B.)
- Hospital Hygiene and Infection Control Team, University Hospital of Montpellier, 34093 Montpellier, France
- UMR 5151 HSM, Equipe Pathogènes Hydriques Santé et Environnements, U.F.R. des Sciences Pharmaceutiques et Biologiques, Université Montpellier, 15, Avenue Charles Flahault, BP 14491, CEDEX 5, 34093 Montpellier, France
- Correspondence: ; Tel.: +33-4-11-75-94-30
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Roulling F, Godin A, Feller G. Function and versatile location of Met-rich inserts in blue oxidases involved in bacterial copper resistance. Biochimie 2022; 194:118-126. [PMID: 34982982 DOI: 10.1016/j.biochi.2021.12.015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Revised: 12/07/2021] [Accepted: 12/29/2021] [Indexed: 11/29/2022]
Abstract
Cuproxidases form a subgroup of the blue multicopper oxidase family. They display disordered methionine-rich loops, not observable in most available crystal structures, which have been suggested to bind toxic Cu(I) ions before oxidation into less harmful Cu(II) by the core enzyme. We found that the location of the Met-rich regions is highly variable in bacterial cuproxidases, but always inserted in solvent exposed surface loops, at close proximity of the conserved T1 copper binding site. We took advantage of the large differences in loop length between cold-adapted, mesophilic and thermophilic oxidase homologs to unravel the function of the methionine-rich regions involved in copper detoxification. Using a newly developed anaerobic assay for cuprous ions, it is shown that the number of Cu(I) bound is nearly proportional to the loop lengths in these cuproxidases and to the number of potential Cu(I) ligands in these loops. In order to substantiate this relation, the longest loop in the cold-adapted oxidase was deleted, lowering bound extra Cu(I) from 9 in the wild-type enzyme to 2-3 Cu(I) in deletion mutants. These results demonstrate that methionine-rich loops behave as molecular octopus scavenging toxic cuprous ions in the periplasm and that these regions are essential components of bacterial copper resistance.
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Affiliation(s)
- Frédéric Roulling
- Laboratory of Biochemistry, Center for Protein Engineering - InBioS, University of Liège, Belgium
| | - Amandine Godin
- Laboratory of Biochemistry, Center for Protein Engineering - InBioS, University of Liège, Belgium
| | - Georges Feller
- Laboratory of Biochemistry, Center for Protein Engineering - InBioS, University of Liège, Belgium.
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Conversion of lignin-derived 3-methoxycatechol to the natural product purpurogallin using bacterial P450 GcoAB and laccase CueO. Appl Microbiol Biotechnol 2021; 106:593-603. [PMID: 34971410 DOI: 10.1007/s00253-021-11738-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2021] [Revised: 12/02/2021] [Accepted: 12/11/2021] [Indexed: 01/02/2023]
Abstract
Purpurogallin is a natural benzotropolone extracted from Quercus spp, which has antioxidant, anticancer, and anti-inflammatory properties. Purpurogallin is typically synthesized from pyrogallol using enzymatic or metal catalysts, neither economically feasible nor environmentally friendly. 3-Methoxycatechol (3-MC) is a lignin-derived renewable chemical with the potential to be a substrate for the biosynthesis of purpurogallin. In this study, we designed a pathway to produce purpurogallin from 3-MC. We first characterized four bacterial laccases and identified the laccase CueO from Escherichia coli, which converts pyrogallol to purpurogallin. Then, we used CueO and the P450 GcoAB reported to convert 3-MC to pyrogallol, to construct a method for producing purpurogallin directly from 3-MC. A total of 0.21 ± 0.05 mM purpurogallin was produced from 5 mM 3-MC by whole-cell conversion. This study provides a new method to enable efficient and sustainable synthesis of purpurogallin and offers new insights into lignin valorization. KEY POINTS: • Screening four bacterial laccases for converting pyrogallol to purpurogallin. • Laccase CueO from Escherichia coli presenting the activity for purpurogallin yield. • A novel pathway for converting lignin-derived 3-methoxycatechol to purpurogallin.
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Durand A, Fouesnard M, Bourbon ML, Steunou AS, Lojou E, Dorlet P, Ouchane S. A periplasmic cupredoxin with a green CuT1.5 center is involved in bacterial copper tolerance. Metallomics 2021; 13:6428408. [PMID: 34791351 DOI: 10.1093/mtomcs/mfab067] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2021] [Accepted: 11/05/2021] [Indexed: 12/26/2022]
Abstract
The importance of copper resistance pathways in pathogenic bacteria is now well recognized, since macrophages use copper to fight bacterial infections. Additionally, considering the increase of antibiotic resistance, growing attention is given to the antimicrobial properties of copper. It is of primary importance to understand how bacteria deal with copper. The Cu-resistant cuproprotein CopI is present in many human bacterial pathogens and environmental bacteria and crucial under microaerobiosis (conditions for most pathogens to thrive within their host). Hence, understanding its mechanism of function is essential. CopI proteins share conserved histidine, cysteine, and methionine residues that could be ligands for different copper binding sites, among which the cupredoxin center could be involved in the protein function. Here, we demonstrated that Vibrio cholerae and Pseudomonas aeruginosa CopI restore the Cu-resistant phenotype in the Rubrivivax gelatinosus ΔcopI mutant. We identified that Cys125 (ligand in the cupredoxin center) and conserved histidines and methionines are essential for R. gelatinosus CopI (RgCopI) function. We also performed spectroscopic analyses of the purified RgCopI protein and showed that it is a green cupredoxin able to bind a maximum of three Cu(II) ions: (i) a green Cu site (CuT1.5), (ii) a type 2 Cu binding site (T2) located in the N-terminal region, and (iii) a third site with a yet unidentified location. CopI is therefore one member of the poorly described CuT1.5 center cupredoxin family. It is unique, since it is a single-domain cupredoxin with more than one Cu site involved in Cu resistance.
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Affiliation(s)
- Anne Durand
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Mélanie Fouesnard
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Marie-Line Bourbon
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | - Anne-Soisig Steunou
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
| | | | - Pierre Dorlet
- CNRS, Aix-Marseille Université, BIP, IMM, Marseille, France
| | - Soufian Ouchane
- CEA, CNRS, Université Paris-Saclay, Institute for Integrative Biology of the Cell (I2BC), 91198 Gif-sur-Yvette, France
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13
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Soldatova AV, Fu W, Romano CA, Tao L, Casey WH, Britt RD, Tebo BM, Spiro TG. Metallo-inhibition of Mnx, a bacterial manganese multicopper oxidase complex. J Inorg Biochem 2021; 224:111547. [PMID: 34403930 DOI: 10.1016/j.jinorgbio.2021.111547] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2021] [Revised: 06/28/2021] [Accepted: 07/13/2021] [Indexed: 11/29/2022]
Abstract
The manganese oxidase complex, Mnx, from Bacillus sp. PL-12 contains a multicopper oxidase (MCO) and oxidizes dissolved Mn(II) to form insoluble manganese oxide (MnO2) mineral. Previous kinetic and spectroscopic analyses have shown that the enzyme's mechanism proceeds through an activation step that facilitates formation of a series of binuclear Mn complexes in the oxidation states II, III, and IV on the path to MnO2 formation. We now demonstrate that the enzyme is inhibited by first-row transition metals in the order of the Irving-Williams series. Zn(II) strongly (Ki ~ 1.5 μM) inhibits both activation and turnover steps, as well as the rate of Mn(II) binding. The combined Zn(II) and Mn(II) concentration dependence establishes that the inhibition is non-competitive. This result is supported by electron paramagnetic resonance (EPR) spectroscopy, which reveals unaltered Mnx-bound Mn(II) EPR signals, both mono- and binuclear, in the presence of Zn(II). We infer that inhibitory metals bind at a site separate from the substrate sites and block the conformation change required to activate the enzyme, a case of allosteric inhibition. The likely biological role of this inhibitory site is discussed in the context of Bacillus spore physiology. While Cu(II) inhibits Mnx strongly, in accord with the Irving-Williams series, it increases Mnx activation at low concentrations, suggesting that weakly bound Cu, in addition to the four canonical MCO-Cu, may support enzyme activity, perhaps as an electron transfer agent.
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Affiliation(s)
- Alexandra V Soldatova
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States
| | - Wen Fu
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Christine A Romano
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
| | - Lizhi Tao
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - William H Casey
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States; Earth and Planetary Sciences Department, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - R David Britt
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Bradley M Tebo
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
| | - Thomas G Spiro
- Department of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States.
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14
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Principles and practice of determining metal-protein affinities. Biochem J 2021; 478:1085-1116. [PMID: 33710331 PMCID: PMC7959690 DOI: 10.1042/bcj20200838] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2020] [Revised: 02/05/2021] [Accepted: 02/11/2021] [Indexed: 01/02/2023]
Abstract
Metal ions play many critical roles in biology, as structural and catalytic cofactors, and as cell regulatory and signalling elements. The metal–protein affinity, expressed conveniently by the metal dissociation constant, KD, describes the thermodynamic strength of a metal–protein interaction and is a key parameter that can be used, for example, to understand how proteins may acquire metals in a cell and to identify dynamic elements (e.g. cofactor binding, changing metal availabilities) which regulate protein metalation in vivo. Here, we outline the fundamental principles and practical considerations that are key to the reliable quantification of metal–protein affinities. We review a selection of spectroscopic probes which can be used to determine protein affinities for essential biological transition metals (including Mn(II), Fe(II), Co(II), Ni(II), Cu(I), Cu(II) and Zn(II)) and, using selected examples, demonstrate how rational probe selection combined with prudent experimental design can be applied to determine accurate KD values.
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15
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Liu J, Yin F, Liu T, Li S, Tan C, Li L, Zhou R, Huang Q. The Tat system and its dependent cell division proteins are critical for virulence of extra-intestinal pathogenic Escherichia coli. Virulence 2020; 11:1279-1292. [PMID: 32962530 PMCID: PMC7549933 DOI: 10.1080/21505594.2020.1817709] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/23/2020] [Accepted: 08/28/2020] [Indexed: 11/29/2022] Open
Abstract
The twin-arginine translocation (Tat) system is involved in a variety of important bacterial physiological processes. Conserved among bacteria and crucial for virulence, the Tat system is deemed as a promising anti-microbial drug target. However, the mechanism of how the Tat system functions in bacterial pathogenesis has not been fully understood. In this study, we showed that the Tat system was critical for the virulence of an extra-intestinal pathogenic E. coli (ExPEC) strain PCN033. A total of 20 Tat-related mutant strains were constructed, and competitive infection assays were performed to evaluate the relative virulence of these mutants. The results demonstrated that several Tat substrate mutants, including the ΔsufI, ΔamiAΔamiC double mutant as well as each single mutant, ΔyahJ, ΔcueO, and ΔnapG, were significantly outcompeted by the WT strain, among which the ΔsufI and ΔamiAΔamiC strains showed the lowest competitive index (CI) value. Results of individual mouse infection assay, in vitro cell adhesion assay, whole blood bactericidal assay, and serum bactericidal assay further confirmed the virulence attenuation phenotype of the ΔsufI and ΔamiAΔamiC strains. Moreover, the two mutants displayed chained morphology in the log phase resembling the Δtat and were defective in stress response. Our results suggest that the Tat system and its dependent cell division proteins SufI, AmiA, and AmiC play critical roles during ExPEC pathogenesis.
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Affiliation(s)
- Jinjin Liu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Fan Yin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Te Liu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Shaowen Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Chen Tan
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- International Research Center for Animal Disease, Ministry of Science and Technology, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture and Rural Affairs of China, Wuhan, China
| | - Lu Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- International Research Center for Animal Disease, Ministry of Science and Technology, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture and Rural Affairs of China, Wuhan, China
| | - Rui Zhou
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- International Research Center for Animal Disease, Ministry of Science and Technology, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture and Rural Affairs of China, Wuhan, China
| | - Qi Huang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- Cooperative Innovation Center for Sustainable Pig Production, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
- International Research Center for Animal Disease, Ministry of Science and Technology, Wuhan, China
- Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture and Rural Affairs of China, Wuhan, China
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16
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Kumar A, Ahlawat S, Mohan H, Sharma KK. Stabilization-destabilization and redox properties of laccases from medicinal mushroom Ganoderma lucidum and human pathogen Yersinia enterocolitica. Int J Biol Macromol 2020; 167:369-381. [PMID: 33275974 DOI: 10.1016/j.ijbiomac.2020.11.169] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 11/09/2020] [Accepted: 11/24/2020] [Indexed: 02/01/2023]
Abstract
Laccases or benzenediol oxygen oxidoreductases (EC 1.10.3.2) are polyphenol multicopper oxidases that are known for their structural and functional diversity in various life forms. In the present study, the molecular and physico-chemical properties (redox-potential and secondary structures) of fungal laccase isozymes (FLIs) isolated from a medicinal mushroom Ganoderma lucidum were analyzed and compared with those of the recombinant bacterial laccases (rLac) obtained from different Yersinia enterocolitica strains. It was revealed that the FLIs contained His-Cys-His as the most conserved residue in its domain I Cu site, while the fourth and fifth residues were variable (Ile, Leu, or Phe). Evidently, the cyclic voltammetric measurements of Glac L2 at Type 1 Cu site revealed greater E° for ABTS/ABTS+ (0.312 V) and ABTS+/ABTS2+ (0.773 V) compared to the E° of rLac. Furthermore, circular dichroism-based conformational analysis revealed structural stability of the FLIs at acidic pH (3.0) and low temperature (<30 °C), while the isozymes were destabilized at neutral pH (7.0) and high-temperature conditions (>70 °C). The zymographic studies further confirmed the functional inactivation of FLIs at high temperatures (≥70 °C), predominantly due to domain unfolding. These findings provide novel insight into the evolution of the catalytic efficiency and redox properties of the FLIs, contributing to the existing knowledge regarding stress responses, metabolite production, and the biotechnological utilization of metabolites.
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Affiliation(s)
- Amit Kumar
- Laboratory of Enzymology and Recombinant DNA Technology, Department of Microbiology, Maharshi Dayanand University, Rohtak 124001, Haryana, India
| | - Shruti Ahlawat
- Laboratory of Enzymology and Recombinant DNA Technology, Department of Microbiology, Maharshi Dayanand University, Rohtak 124001, Haryana, India
| | - Hari Mohan
- Centre for Medical Biotechnology, Maharshi Dayanand University, Rohtak 124001, Haryana, India
| | - Krishna Kant Sharma
- Laboratory of Enzymology and Recombinant DNA Technology, Department of Microbiology, Maharshi Dayanand University, Rohtak 124001, Haryana, India.
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17
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Ji J, Chung Y, Hyun K, Chung KY, Kwon Y. Effect of axial ligand on the performance of hemin based catalysts and their use for fuel cells. J IND ENG CHEM 2020. [DOI: 10.1016/j.jiec.2020.05.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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18
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Zouraris D, Kiafi S, Zerva A, Topakas E, Karantonis A. FTacV study of electroactive immobilized enzyme/free substrate reactions: Enzymatic catalysis of epinephrine by a multicopper oxidase from Thermothelomyces thermophila. Bioelectrochemistry 2020; 134:107538. [PMID: 32380451 DOI: 10.1016/j.bioelechem.2020.107538] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2020] [Revised: 04/15/2020] [Accepted: 04/16/2020] [Indexed: 01/02/2023]
Abstract
In the present work, a kinetic analysis is made concerning the reaction of an electroactive immobilized enzyme with a free substrate, based on a Michaelis-Menten scheme. The proposed kinetic equations are investigated numerically for conditions describing large amplitude fast Fourier transform alternating current voltammetry (FTacV), under different reaction states (transient or steady state for the reaction intermediate as well as quasi or complete reversibility of the electrochemical step). The dependence of two chief observables that occur from the analysis of the results of the method, that is, the maximum of the harmonics and the potential shift of the corresponding dominant peaks, on substrate concentration is presented. The FTacV method is applied experimentally for an immobilized laccase-like multicopper oxidase from Thermothelomyces thermophila, TtLMCO1, and its reaction with epinephrine. From the experimental findings it is shown that the intrinsic characteristics of the system do not lead to the extraction of the desired kinetic data although indications on the relation between the kinetic constants is revealed. Finally, the response of the third harmonic for the first additions of epinephrine at subnanomolarity range can be exploited for the detection of epinephrine at rather low concentrations.
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Affiliation(s)
- D Zouraris
- Laboratory of Physical Chemistry and Applied Electrochemistry, School of Chemical Engineering, National Technical University of Athens, 15780 Zografou, Athens, Greece
| | - S Kiafi
- Laboratory of Physical Chemistry and Applied Electrochemistry, School of Chemical Engineering, National Technical University of Athens, 15780 Zografou, Athens, Greece
| | - A Zerva
- IndBioCat Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 15780 Zografou, Athens, Greece
| | - E Topakas
- IndBioCat Group, Biotechnology Laboratory, School of Chemical Engineering, National Technical University of Athens, 15780 Zografou, Athens, Greece
| | - A Karantonis
- Laboratory of Physical Chemistry and Applied Electrochemistry, School of Chemical Engineering, National Technical University of Athens, 15780 Zografou, Athens, Greece.
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19
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Zhang L, Cui H, Dhoke GV, Zou Z, Sauer DF, Davari MD, Schwaneberg U. Engineering of Laccase CueO for Improved Electron Transfer in Bioelectrocatalysis by Semi-Rational Design. Chemistry 2020; 26:4974-4979. [PMID: 31985091 PMCID: PMC7186830 DOI: 10.1002/chem.201905598] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/22/2020] [Indexed: 12/20/2022]
Abstract
Copper efflux oxidase (CueO) from Escherichia coli is a special bacterial laccase due to its fifth copper binding site. Herein, it is discovered that the fifth Cu occupancy plays a crucial and favorable role of electron relay in bioelectrocatalytic oxygen reduction. By substituting the residues at the four coordinated positions of the fifth Cu, 11 beneficial variants are identified with ≥2.5-fold increased currents at -250 mV (up to 6.13 mA cm-2 ). Detailed electrocatalytic characterization suggests the microenvironment of the fifth Cu binding site governs the electrocatalytic current of CueO. Additionally, further electron transfer analysis assisted by molecular dynamics (MD) simulation demonstrates that an increase in localized structural stability and a decrease of distance between the fifth Cu and the T1 Cu are two main factors contributing to the improved kinetics of CueO variants. It may guide a novel way to tailor laccases and perhaps other oxidoreductases for bioelectrocatalytic applications.
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Affiliation(s)
- Lingling Zhang
- Institute of BiotechnologyRWTH Aachen UniversityWorringer Weg 352074AachenGermany
| | - Haiyang Cui
- Institute of BiotechnologyRWTH Aachen UniversityWorringer Weg 352074AachenGermany
| | - Gaurao V. Dhoke
- Institute of BiotechnologyRWTH Aachen UniversityWorringer Weg 352074AachenGermany
| | - Zhi Zou
- Institute of BiotechnologyRWTH Aachen UniversityWorringer Weg 352074AachenGermany
- DWI Leibniz-Institute for Interactive MaterialsForckenbeckstrasse 5052074AachenGermany
| | - Daniel F. Sauer
- Institute of BiotechnologyRWTH Aachen UniversityWorringer Weg 352074AachenGermany
| | - Mehdi D. Davari
- Institute of BiotechnologyRWTH Aachen UniversityWorringer Weg 352074AachenGermany
| | - Ulrich Schwaneberg
- Institute of BiotechnologyRWTH Aachen UniversityWorringer Weg 352074AachenGermany
- DWI Leibniz-Institute for Interactive MaterialsForckenbeckstrasse 5052074AachenGermany
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20
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Simić S, Jeremic S, Djokic L, Božić N, Vujčić Z, Lončar N, Senthamaraikannan R, Babu R, Opsenica IM, Nikodinovic-Runic J. Development of an efficient biocatalytic system based on bacterial laccase for the oxidation of selected 1,4-dihydropyridines. Enzyme Microb Technol 2020; 132:109411. [DOI: 10.1016/j.enzmictec.2019.109411] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2019] [Revised: 08/14/2019] [Accepted: 08/17/2019] [Indexed: 01/17/2023]
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21
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Hitaishi VP, Clément R, Quattrocchi L, Parent P, Duché D, Zuily L, Ilbert M, Lojou E, Mazurenko I. Interplay between Orientation at Electrodes and Copper Activation of Thermus thermophilus Laccase for O2 Reduction. J Am Chem Soc 2019; 142:1394-1405. [DOI: 10.1021/jacs.9b11147] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Vivek Pratap Hitaishi
- Aix Marseille Univ, CNRS, BIP UMR 7281, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
- Aix Marseille Univ, CNRS, IMM FR 3479, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
| | - Romain Clément
- Aix Marseille Univ, CNRS, BIP UMR 7281, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
- Aix Marseille Univ, CNRS, IMM FR 3479, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
| | - Ludovica Quattrocchi
- Aix Marseille Univ, CNRS, BIP UMR 7281, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
- Aix Marseille Univ, CNRS, IMM FR 3479, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
| | - Philippe Parent
- Aix Marseille Univ, CNRS, CINAM UMR 7325, Campus de Luminy, 13288 Marseille, Cedex 09, France
| | - David Duché
- Aix Marseille Univ, Université de Toulon, CNRS, IM2NP UMR 7334, 13397 Marseille, France
| | - Lisa Zuily
- Aix Marseille Univ, CNRS, BIP UMR 7281, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
- Aix Marseille Univ, CNRS, IMM FR 3479, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
| | - Marianne Ilbert
- Aix Marseille Univ, CNRS, BIP UMR 7281, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
- Aix Marseille Univ, CNRS, IMM FR 3479, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
| | - Elisabeth Lojou
- Aix Marseille Univ, CNRS, BIP UMR 7281, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
- Aix Marseille Univ, CNRS, IMM FR 3479, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
| | - Ievgen Mazurenko
- Aix Marseille Univ, CNRS, BIP UMR 7281, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
- Aix Marseille Univ, CNRS, IMM FR 3479, 31 Chemin Aiguier, CS 70071, 13402 Marseille, Cedex 09, France
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22
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Cai X, Zheng X, Zhang D, Iqbal W, Liu C, Yang B, Zhao X, Lu X, Mao Y. Microbial characterization of heavy metal resistant bacterial strains isolated from an electroplating wastewater treatment plant. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2019; 181:472-480. [PMID: 31228823 DOI: 10.1016/j.ecoenv.2019.06.036] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 06/09/2019] [Accepted: 06/12/2019] [Indexed: 06/09/2023]
Abstract
Heavy metal pollution is one of the most widespread and complex environmental issues globally, posing a great threat to the ecosystem as well as human health. Bioremediation through heavy metal-resistant bacteria (HMRB) is currently the most promising technology to address this issue. To obtain HMRB to remediate heavy metal pollution potentially, 15 culturable HMRB strains were isolated from the sludge samples of an electroplating wastewater treatment plant (EWWTP), which belonged to the Bacillus, Shewanella, Lysinibacillus, and Acinetobacter genera. Their maximum tolerance concentrations to Cu2+, Ni2+, Mn2+, Co2+, and Cr2O72- were 40 mM, 10 mM, 200 mM, 40 mM, and 10 mM, respectively, and strain Mn1-4 showed much higher Mn2+ tolerance and removal effectiveness (3.355 g/L) than previously published reports. Moreover, multiple heavy metal-resistant genotypes and phenotypes were identified among these strains, of which strain Co1-1 carried the most of resistant gene sequences (10) and exhibited resistance to 7 categories of heavy metals, and the co-occurrence of heavy metal and antibiotic resistance were clearly observed in strain Ni1-3. In addition, flanked insert sequence (IS) elements on the heavy metal resistant genes (HMRGs) suggested that horizontal gene transfer (HGT) events may have resulted in multiple heavy metal resistance phenotypes and genotypes in these strains, and IS982 family transposase was presumed to result in the high Ni2+ tolerance in strain Ni1-3. This study expands our understanding of bacterial heavy metal resistance and provides promising candidates for heavy metal bioremediation.
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Affiliation(s)
- Xunchao Cai
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China
| | - Xin Zheng
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China
| | - Dunnan Zhang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China
| | - Waheed Iqbal
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China
| | - Changkun Liu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China
| | - Bo Yang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China
| | - Xu Zhao
- Key Laboratory of Drinking Water Science and Technology, Research Centre for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
| | - Xiaoying Lu
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China; Faculty of Science and Technology, Technological and Higher Education Institute of Hong Kong, Tsing Yi, N.T, Hong Kong, China
| | - Yanping Mao
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China.
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Singh N, Paknikar KM, Rajwade J. Gene expression is influenced due to 'nano' and 'ionic' copper in pre-formed Pseudomonas aeruginosa biofilms. ENVIRONMENTAL RESEARCH 2019; 175:367-375. [PMID: 31153105 DOI: 10.1016/j.envres.2019.05.034] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 05/20/2019] [Accepted: 05/21/2019] [Indexed: 06/09/2023]
Abstract
Today, researchers across the globe suggest the use of antimicrobial coatings containing copper nanoparticles (CuNPs) complementing the traditional protocols to prevent hospital-acquired infections (HAIs). Since Pseudomonas aeruginosa is one of the commonest opportunistic pathogens, we assessed the anti-biofilm activity of CuNPs in P. aeruginosa MTCC 3541 and compared it with Cu2+ (copper sulphate) since the latter continues to be used as an antimicrobial-of-choice in food industries, agriculture and water treatment. In this study, we synthesized and characterized stable poly-acrylic acid (PAA) coated CuNPs with a size of 66-150 nm and zeta potential -13 mV. Pseudomonas aeruginosa MTCC 3541 biofilms were highly resistant to both CuNPs and Cu2+ (minimum biofilm inhibitory concentration, MBIC 300 and >600 μg/mL respectively). Scanning electron microscopy revealed alterations in cell morphology upon treatment with CuNPs. A closer analysis of the biofilm-specific gene expression (qRT-PCR) revealed that CuNPs downregulated the genes involved in biofilm matrix formation, motility, efflux, membrane lipoprotein synthesis and DNA replication. Both, CuNPs and Cu2+ up regulated copper resistance and biofilm dispersion genes. Copper did not affect the bacterial communication system as evidenced by downregulation of the negative regulator of quorum sensing. The gene expression analysis reveals multiple cellular targets for CuNPs and ionic Cu. The present study highlights the fact that CuNPs affect the membrane functions adversely damaging the cell surface. In pre-formed biofilms, CuNPs were more toxic and displayed distinct responses attributable due to 'nano' and 'ionic' copper. Our findings thus support the use of CuNPs for curbing HAIs.
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Affiliation(s)
- Nimisha Singh
- Nanobioscience Group, Agharkar Research Institute, G. G. Agarkar Road, Pune, 411 004, Maharashtra, India; Savitribai Phule Pune University, Ganeshkind Road, Pune, 41107, Maharashtra, India
| | - Kishore M Paknikar
- Nanobioscience Group, Agharkar Research Institute, G. G. Agarkar Road, Pune, 411 004, Maharashtra, India; Savitribai Phule Pune University, Ganeshkind Road, Pune, 41107, Maharashtra, India.
| | - Jyutika Rajwade
- Nanobioscience Group, Agharkar Research Institute, G. G. Agarkar Road, Pune, 411 004, Maharashtra, India; Savitribai Phule Pune University, Ganeshkind Road, Pune, 41107, Maharashtra, India.
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24
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Udagedara SR, Wijekoon CJ, Xiao Z, Wedd AG, Maher MJ. The crystal structure of the CopC protein from Pseudomonas fluorescens reveals amended classifications for the CopC protein family. J Inorg Biochem 2019; 195:194-200. [DOI: 10.1016/j.jinorgbio.2019.03.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2018] [Revised: 02/26/2019] [Accepted: 03/07/2019] [Indexed: 01/09/2023]
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25
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Enhanced expression of a recombinant multicopper oxidase, CueO, from Escherichia coli and its laccase activity towards aromatic substrates. Polym Degrad Stab 2019. [DOI: 10.1016/j.polymdegradstab.2019.02.027] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Sana B, Chee SMQ, Wongsantichon J, Raghavan S, Robinson RC, Ghadessy FJ. Development and structural characterization of an engineered multi-copper oxidase reporter of protein-protein interactions. J Biol Chem 2019; 294:7002-7012. [PMID: 30770473 PMCID: PMC6497955 DOI: 10.1074/jbc.ra118.007141] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2018] [Revised: 02/10/2019] [Indexed: 12/13/2022] Open
Abstract
Protein–protein interactions (PPIs) are ubiquitous in almost all biological processes and are often corrupted in diseased states. A detailed understanding of PPIs is therefore key to understanding cellular physiology and can yield attractive therapeutic targets. Here, we describe the development and structural characterization of novel Escherichia coli CueO multi-copper oxidase variants engineered to recapitulate protein–protein interactions with commensurate modulation of their enzymatic activities. The fully integrated single-protein sensors were developed through modular grafting of ligand-specific peptides into a highly compliant and flexible methionine-rich loop of CueO. Sensitive detection of diverse ligand classes exemplified by antibodies, an E3 ligase, MDM2 proto-oncogene (MDM2), and protease (SplB from Staphylococcus aureus) was achieved in a simple mix and measure homogeneous format with visually observable colorimetric readouts. Therapeutic antagonism of MDM2 by small molecules and peptides in clinical development for treatment of cancer patients was assayed using the MDM2-binding CueO enzyme. Structural characterization of the free and MDM2-bound CueO variant provided functional insight into signal-transducing mechanisms of the engineered enzymes and highlighted the robustness of CueO as a stable and compliant scaffold for multiple applications.
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Affiliation(s)
- Barindra Sana
- From the p53 Laboratory, Agency for Science, Technology, and Research (A*STAR), 8A Biomedical Grove, Singapore 138648, Singapore
| | - Sharon M Q Chee
- From the p53 Laboratory, Agency for Science, Technology, and Research (A*STAR), 8A Biomedical Grove, Singapore 138648, Singapore
| | - Jantana Wongsantichon
- the Mahidol-Oxford Tropical Medicine Research Unit, Mahidol University, Bangkok 10400, Thailand, and.,the Institute of Molecular and Cellular Biology, A*STAR, 61 Biopolis Drive, Singapore 138673, Singapore
| | - Sarada Raghavan
- From the p53 Laboratory, Agency for Science, Technology, and Research (A*STAR), 8A Biomedical Grove, Singapore 138648, Singapore
| | - Robert C Robinson
- the Institute of Molecular and Cellular Biology, A*STAR, 61 Biopolis Drive, Singapore 138673, Singapore
| | - Farid J Ghadessy
- From the p53 Laboratory, Agency for Science, Technology, and Research (A*STAR), 8A Biomedical Grove, Singapore 138648, Singapore,
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27
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Stewart LJ, Thaqi D, Kobe B, McEwan AG, Waldron KJ, Djoko KY. Handling of nutrient copper in the bacterial envelope. Metallomics 2019; 11:50-63. [DOI: 10.1039/c8mt00218e] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The insertion of copper into bacterial cuproenzymesin vivodoes not always require a copper-binding metallochaperone – why?
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Affiliation(s)
- Louisa J. Stewart
- Institute for Cell and Molecular Biosciences
- Newcastle University
- Newcastle upon Tyne
- UK
| | - Denis Thaqi
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre
- The University of Queensland
- St Lucia
- Australia
| | - Bostjan Kobe
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre
- The University of Queensland
- St Lucia
- Australia
- Institute for Molecular Bioscience
| | - Alastair G. McEwan
- School of Chemistry and Molecular Biosciences and Australian Infectious Diseases Research Centre
- The University of Queensland
- St Lucia
- Australia
| | - Kevin J. Waldron
- Institute for Cell and Molecular Biosciences
- Newcastle University
- Newcastle upon Tyne
- UK
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28
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Abstract
Metals and metalloids have been used alongside antibiotics in livestock production for a long time. The potential and acute negative impact on the environment and human health of these livestock feed supplements has prompted lawmakers to ban or discourage the use of some or all of these supplements. This article provides an overview of current use in the European Union and the United States, detected metal resistance determinants, and the proteins and mechanisms responsible for conferring copper and zinc resistance in bacteria. A detailed description of the most common copper and zinc metal resistance determinants is given to illustrate not only the potential danger of coselecting antibiotic resistance genes but also the potential to generate bacterial strains with an increased potential to be pathogenic to humans. For example, the presence of a 20-gene copper pathogenicity island is highlighted since bacteria containing this gene cluster could be readily isolated from copper-fed pigs, and many pathogenic strains, including Escherichia coli O104:H4, contain this potential virulence factor, suggesting a potential link between copper supplements in livestock and the evolution of pathogens.
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Crystal structures of multicopper oxidase CueO G304K mutant: structural basis of the increased laccase activity. Sci Rep 2018; 8:14252. [PMID: 30250139 PMCID: PMC6155172 DOI: 10.1038/s41598-018-32446-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2017] [Accepted: 09/05/2018] [Indexed: 01/13/2023] Open
Abstract
The multicopper oxidase CueO is involved in copper homeostasis and copper (Cu) tolerance in Escherichia coli. The laccase activity of CueO G304K mutant is higher than wild-type CueO. To explain this increase in activity, we solved the crystal structure of G304K mutant at 1.49 Å. Compared with wild-type CueO, the G304K mutant showed dramatic conformational changes in methionine-rich helix and the relative regulatory loop (R-loop). We further solved the structure of Cu-soaked enzyme, and found that the addition of Cu ions induced further conformational changes in the R-loop and methionine-rich helix as a result of the new Cu-binding sites on the enzyme's surface. We propose a mechanism for the enhanced laccase activity of the G304K mutant, where movements of the R-loop combined with the changes of the methionine-rich region uncover the T1 Cu site allowing greater access of the substrate. Two of the G304K double mutants showed the enhanced or decreased laccase activity, providing further evidence for the interaction between the R-loop and the methionine-rich region. The cuprous oxidase activity of these mutants was about 20% that of wild-type CueO. These structural features of the G304K mutant provide clues for designing specific substrate-binding mutants in the biotechnological applications.
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30
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Thermodynamic stability and structure in aqueous solution of the [Cu(PTA) 4] + complex (PTA = aminophosphine‑1,3,5‑triaza‑7‑phosphaadamantane). J Inorg Biochem 2018; 188:50-61. [PMID: 30121398 DOI: 10.1016/j.jinorgbio.2018.08.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 06/25/2018] [Accepted: 08/08/2018] [Indexed: 01/05/2023]
Abstract
The chemistry of copper(I) with water-soluble phosphines is an emergent area of study which has the objective of finding ligands that stabilize copper in its lower oxidation state. Cu(I) has been found relevant in the mechanism of copper transports into cells, and the accessibility of this oxidation state has implications in oxidative stress processes. For these reasons the possibility to deal with stable, water soluble copper(I) is an attractive approach for devising new biologically relevant metal-based drugs and chelating agents. Here we present the X-ray absorption spectroscopy (XAS) and UV-visible spectrophotometric study of the [Cu(PTA)4]BF4 complex (PTA = aminophosphine‑1,3,5‑triaza‑7‑phosphaadamantane). In particular, we have studied the stability of the [Cu(PTA)n]+ species (n = 2-4) in aqueous medium, and their speciation as a function of the total [Cu(PTA)4]BF4 concentration by means of competitive UV-visible spectrophotometric titrations using metallochromic indicators. Also, the structure in solution of the Cu(I)/PTA species and the nature of the first coordination sphere of the metal were studied by transformed XAS. Both techniques allowed to study samples with total [Cu(PTA)4]BF4 concentration down to 68-74 μM, possibly relevant for biological applications. Overall, our data suggest that the [Cu(PTA)n]+ species are stable in solution, among which [Cu(PTA)2]+ has a remarkable thermodynamic stability. The tendency of this last complex to form adducts with N-donor ligands is demonstrated by the spectrophotometric data. The biological relevance of PTA towards Cu(I), especially in terms of chemotreatments and chelation therapy, is discussed on the basis of the speciation model the Cu(I)/PTA system.
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31
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Pacheco CC, Büttel Z, Pinto F, Rodrigo G, Carrera J, Jaramillo A, Tamagnini P. Modulation of Intracellular O 2 Concentration in Escherichia coli Strains Using Oxygen Consuming Devices. ACS Synth Biol 2018; 7:1742-1752. [PMID: 29952558 DOI: 10.1021/acssynbio.7b00428] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The use of cell factories for the production of bulk and value-added compounds is nowadays an advantageous alternative to the traditional petrochemical methods. Nevertheless, the efficiency and productivity of several of these processes can improve with the implementation of micro-oxic or anoxic conditions. In the industrial setting, laccases are appealing catalysts that can oxidize a wide range of substrates and reduce O2 to H2O. In this work, several laccase-based devices were designed and constructed to modulate the intracellular oxygen concentration in bacterial chassis. These oxygen consuming devices (OCDs) included Escherichia coli's native laccase (CueO) and three variants of this protein obtained by directed evolution. The OCDs were initially characterized in vitro using E. coli DH5α protein extracts and subsequently using extracts obtained from other E. coli strains and in vivo. Upon induction of the OCDs, no major effect on growth was observed in four of the strains tested, and analysis of the cell extract protein profiles revealed increased levels of laccase. Moreover, oxygen consumption associated with the OCDs occurred under all of the conditions tested, but the performance of the devices was shown to be strain-dependent, highlighting the importance of the genetic background even in closely related strains. One of the laccase variants showed 13- and 5-fold increases in oxidase activity and O2 consumption rate, respectively. Furthermore, it was also possible to demonstrate O2 consumption in vivo using l-DOPA as the substrate, which represents a proof of concept that these OCDs generate an intracellular oxygen sink, thereby manipulating the redox status of the cells. In addition, the modularity and orthogonality principles used for the development of these devices allow easy reassembly and fine-tuning, foreseeing their introduction into other chassis/systems.
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Affiliation(s)
- Catarina C. Pacheco
- i3S - Instituto de Investigação e Inovação em Saúde, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
| | - Zsófia Büttel
- i3S - Instituto de Investigação e Inovação em Saúde, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
| | - Filipe Pinto
- i3S - Instituto de Investigação e Inovação em Saúde, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
| | - Guillermo Rodrigo
- Instituto de Biologia Molecular y Celular de Plantas, CSIC, Universidad Politècnica de València, Camí de Vera s/n, 46022 València, Spain
- Institute for Integrative Systems Biology (I2SysBio), University of Valencia-CSIC, 46980 Paterna, Spain
| | - Javier Carrera
- Department of Bioengineering, Stanford University, 443 Via Ortega, Stanford, California 94305-4125, United States
| | - Alfonso Jaramillo
- Warwick Integrative Synthetic Biology Centre and School of Life Sciences, University of Warwick, Coventry CV4 7AL, U.K
- CNRS-UMR8030, Laboratoire iSSB and Université Paris-Saclay and Université d’Évry and CEA, DRF, IG, Genoscope, Évry 91000, France
- Institute for Integrative Systems Biology (I2SysBio), University of Valencia-CSIC, 46980 Paterna, Spain
| | - Paula Tamagnini
- i3S - Instituto de Investigação e Inovação em Saúde, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
- IBMC - Instituto de Biologia Molecular e Celular, Universidade do Porto, Rua Alfredo Allen 208, 4200-135 Porto, Portugal
- Departamento de Biologia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, Edifício FC4, 4169-007 Porto, Portugal
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33
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Bello-Gil D, Roig-Molina E, Fonseca J, Sarmiento-Ferrández MD, Ferrándiz M, Franco E, Mira E, Maestro B, Sanz JM. An enzymatic system for decolorization of wastewater dyes using immobilized CueO laccase-like multicopper oxidase on poly-3-hydroxybutyrate. Microb Biotechnol 2018; 11:881-892. [PMID: 29896867 PMCID: PMC6116751 DOI: 10.1111/1751-7915.13287] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Revised: 04/28/2018] [Accepted: 05/24/2018] [Indexed: 01/06/2023] Open
Abstract
The presence of synthetic dyes in wastewaters generated by the textile industry constitutes a serious environmental and health problem that urges the scientific community on an appropriate action. As a proof‐of‐concept, we have developed a novel approach to design enzymatic bioreactors with the ability to decolorize dye solutions through the immobilization of the bacterial CueO laccase‐like multicopper oxidase from Escherichia coli on polyhydroxybutyrate (PHB) beads by making use of the BioF affinity tag. The decolorization efficiency of the system was characterized by a series of parameters, namely maximum enzyme adsorption capacity, pH profile, kinetic constants, substrate range, temperature and bioreactor recycling. Depending on the tested dye, immobilization increased the catalytic activity of CueO by up to 40‐fold with respect to the soluble enzyme, reaching decolorization efficiencies of 45–90%. Our results indicate that oxidase bioreactors based on polyhydroxyalkanoates are a promising alternative for the treatment of coloured industrial wastewaters.
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Affiliation(s)
- Daniel Bello-Gil
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Avda. Universidad s/n, 03202, Elche, Spain
| | - Emma Roig-Molina
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Avda. Universidad s/n, 03202, Elche, Spain
| | - Jennifer Fonseca
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Avda. Universidad s/n, 03202, Elche, Spain
| | | | - Marcela Ferrándiz
- Biotechnology Research Group, Textile Research Institute (AITEX), Plaza Emilio Sala 1, 03801, Alcoy, Spain
| | - Esther Franco
- Biotechnology Research Group, Textile Research Institute (AITEX), Plaza Emilio Sala 1, 03801, Alcoy, Spain
| | - Elena Mira
- Biotechnology Research Group, Textile Research Institute (AITEX), Plaza Emilio Sala 1, 03801, Alcoy, Spain
| | - Beatriz Maestro
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Avda. Universidad s/n, 03202, Elche, Spain
| | - Jesús M Sanz
- Instituto de Biología Molecular y Celular, Universidad Miguel Hernández, Avda. Universidad s/n, 03202, Elche, Spain.,Centro de Investigaciones Biológicas, Consejo Superior de Investigaciones Científicas, c/Ramiro de Maeztu 9, 28040, Madrid, Spain
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34
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Chen D, Wang X, He Y, Kai T, Li Z, Xiang J, Jiang D, Zhou F. Studies of Electrode Reactions and Coordination Geometries of Cu(I) and Cu(II) Complexes with Bicinchoninic Acid. ELECTROANAL 2018. [DOI: 10.1002/elan.201700741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Dinglong Chen
- College of Chemistry and Chemical Engineering; Central South University, Changsha; Hunan 410008 P. R. China
| | - Xiaoying Wang
- College of Chemistry and Chemical Engineering; Central South University, Changsha; Hunan 410008 P. R. China
| | - Yonghui He
- Key Laboratory of Chemistry in Ethnic Medicine Resource, State Ethnic Affairs Commission & Ministry of Education; Yunnan Minzu University; Kunming 650031 P. R. China
| | - Tianhan Kai
- Department of Chemistry and Biochemistry; California State University, Los Angeles; Los Angeles CA 90032
| | - Zhiqiang Li
- Department of Chemistry and Biochemistry; California State University, Los Angeles; Los Angeles CA 90032
| | - Juan Xiang
- College of Chemistry and Chemical Engineering; Central South University, Changsha; Hunan 410008 P. R. China
| | - Dianlu Jiang
- Department of Chemistry and Biochemistry; California State University, Los Angeles; Los Angeles CA 90032
| | - Feimeng Zhou
- Department of Chemistry and Biochemistry; California State University, Los Angeles; Los Angeles CA 90032
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35
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Kosman DJ. The teleos of metallo-reduction and metallo-oxidation in eukaryotic iron and copper trafficking. Metallomics 2018; 10:370-377. [PMID: 29484341 DOI: 10.1039/c8mt00015h] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Eukaryotic cells, whether free-living or organismal, rely on metallo-reductases to process environmental ferric iron and cupric copper prior to uptake. In addition, some free-living eukaryotes (e.g. fungi and algae) couple ferri-reduction to ferro-oxidation, a process catalyzed by a small cohort of multi-copper oxidases; in these organisms, the ferric iron product is a ligand for cell iron uptake via a ferric iron permease. In addition to their support of iron uptake in lower eukaryotes, ferroxidases support ferrous iron efflux in Chordata; in this process the release of the ferrous iron from the efflux transporter is catalyzed by its ferroxidation. Last, ferroxidases also catalyze the oxidation of cuprous copper and, as metallo-oxidases, mirror the dual activity of the metallo-reductases. This Perspective examines the teleos of the yin-yang of this redox cycling of iron and copper in their metabolism.
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Affiliation(s)
- Daniel J Kosman
- Department of Biochemistry, Jacobs School of Medicine and Biomedical Sciences, The University at Buffalo, Farber Hall Room 140, 3435 Main St., Buffalo, NY 14214-3000, USA.
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36
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Soldatova AV, Tao L, Romano CA, Stich TA, Casey WH, Britt RD, Tebo BM, Spiro TG. Mn(II) Oxidation by the Multicopper Oxidase Complex Mnx: A Binuclear Activation Mechanism. J Am Chem Soc 2017; 139:11369-11380. [PMID: 28712284 DOI: 10.1021/jacs.7b02771] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The bacterial protein complex Mnx contains a multicopper oxidase (MCO) MnxG that, unusually, catalyzes the two-electron oxidation of Mn(II) to MnO2 biomineral, via a Mn(III) intermediate. Although Mn(III)/Mn(II) and Mn(IV)/Mn(III) reduction potentials are expected to be high, we find a low reduction potential, 0.38 V (vs Normal Hydrogen Electrode, pH 7.8), for the MnxG type 1 Cu2+, the electron acceptor. Indeed the type 1 Cu2+ is not reduced by Mn(II) in the absence of molecular oxygen, indicating that substrate oxidation requires an activation step. We have investigated the enzyme mechanism via electronic absorption spectroscopy, using chemometric analysis to separate enzyme-catalyzed MnO2 formation from MnO2 nanoparticle aging. The nanoparticle aging time course is characteristic of nucleation and particle growth; rates for these processes followed expected dependencies on Mn(II) concentration and temperature, but exhibited different pH optima. The enzymatic time course is sigmoidal, signaling an activation step, prior to turnover. The Mn(II) concentration and pH dependence of a preceding lag phase indicates weak Mn(II) binding. The activation step is enabled by a pKa > 8.6 deprotonation, which is assigned to Mn(II)-bound H2O; it induces a conformation change (consistent with a high activation energy, 106 kJ/mol) that increases Mn(II) affinity. Mnx activation is proposed to decrease the Mn(III/II) reduction potential below that of type 1 Cu(II/I) by formation of a hydroxide-bridged binuclear complex, Mn(II)(μ-OH)Mn(II), at the substrate site. Turnover is found to depend cooperatively on two Mn(II) and is enabled by a pKa 7.6 double deprotonation. It is proposed that turnover produces a Mn(III)(μ-OH)2Mn(III) intermediate that proceeds to the enzyme product, likely Mn(IV)(μ-O)2Mn(IV) or an oligomer, which subsequently nucleates MnO2 nanoparticles. We conclude that Mnx exploits manganese polynuclear chemistry in order to facilitate an otherwise difficult oxidation reaction, as well as biomineralization. The mechanism of the Mn(III/IV) conversion step is elucidated in an accompanying paper .
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Affiliation(s)
- Alexandra V Soldatova
- Department of Chemistry, University of Washington , Box 351700, Seattle, Washington 98195, United States
| | | | - Christine A Romano
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University , Portland, Oregon 97239, United States
| | | | | | | | - Bradley M Tebo
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University , Portland, Oregon 97239, United States
| | - Thomas G Spiro
- Department of Chemistry, University of Washington , Box 351700, Seattle, Washington 98195, United States
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37
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Mancini S, Kumar R, Mishra V, Solioz M. Desulfovibrio DA2_CueO is a novel multicopper oxidase with cuprous, ferrous and phenol oxidase activity. Microbiology (Reading) 2017; 163:1229-1236. [DOI: 10.1099/mic.0.000509] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Affiliation(s)
- Stefano Mancini
- Department of Clinical Research, University of Bern, 3010 Bern, Switzerland
| | - Ranjeet Kumar
- Laboratory of Biochemistry and Molecular Biology, Tomsk State University, 634050 Tomsk, Russia
| | - Veena Mishra
- Laboratory of Biochemistry and Molecular Biology, Tomsk State University, 634050 Tomsk, Russia
| | - Marc Solioz
- Department of Clinical Research, University of Bern, 3010 Bern, Switzerland
- Laboratory of Biochemistry and Molecular Biology, Tomsk State University, 634050 Tomsk, Russia
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38
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Tao L, Stich TA, Liou SH, Soldatova AV, Delgadillo DA, Romano CA, Spiro TG, Goodin DB, Tebo BM, Casey WH, Britt RD. Copper Binding Sites in the Manganese-Oxidizing Mnx Protein Complex Investigated by Electron Paramagnetic Resonance Spectroscopy. J Am Chem Soc 2017; 139:8868-8877. [DOI: 10.1021/jacs.7b02277] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
| | | | | | - Alexandra V. Soldatova
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States
| | - David A. Delgadillo
- Department of Chemistry & Chemical Biology, University of California, 5200 North Lake Road, Merced, California 95343, United States
| | - Christine A. Romano
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
| | - Thomas G. Spiro
- Department
of Chemistry, University of Washington, Box 351700, Seattle, Washington 98195, United States
| | | | - Bradley M. Tebo
- Division of Environmental and Biomolecular Systems, Institute of Environmental Health, Oregon Health & Science University, Portland, Oregon 97239, United States
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39
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Cortes L, Roberts BR, Wedd AG, Xiao Z. Molecular Aspects of a Robust Assay for Ferroxidase Function of Ceruloplasmin. Inorg Chem 2017; 56:5275-5284. [PMID: 28414228 DOI: 10.1021/acs.inorgchem.7b00372] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ceruloplasmin (Cp) is one of the most complex multicopper oxidase enzymes and plays an essential role in the metabolism of iron in mammals. Ferrous ion supplied by the ferroportin exporter is converted by Cp to ferric ion that is accepted by plasma metallo-chaperone transferrin. Study of the enzyme at the atomic and molecular level has been hampered by the lack of a suitable ferrous substrate. We have developed the classic chromophoric complex FeIIHx(Tar)2 (H2Tar, 4-(2-thiazolylazo)resorcinol; x = 0-2; overall charge omitted) as a robust substrate for evaluation of the ferroxidase function of Cp and related enzymes. The catalysis can be followed conveniently in real time by monitoring the solution absorbance at 720 nm, a fingerprint of FeIIHx(Tar)2. The complex is oxidized to its ferric form FeIIIHx(Tar)2 via the overall reaction sequence FeIIHx(Tar)2 → FeII-Cp → FeIII-Cp → FeIIIHx(Tar)2: i.e., Fe(II) is transferred formally from FeIIHx(Tar)2 to the substrate docking/oxidation (SDO) site(s) in Cp, followed by oxidation to product Fe(III) that is trapped again by the ligand. Each Tar ligand in the above bis-complex coordinates the metal center in a meridional tridentate mode involving a pH-sensitive -OH group (pKa > 12), and this imposes rapid Fe(II) and Fe(III) transfer kinetics to facilitate the catalytic process. The formation constants of both the ferrous and ferric complexes at pH 7.0 were determined (log β2' = 13.6 and 21.6, respectively), as well as an average dissociation constant of the SDO site(s) in Cp (log KD' = -7.2).
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Affiliation(s)
- Laura Cortes
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne , Parkville, Victoria 3010, Australia.,The Florey Institute of Neuroscience and Mental Health, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Blaine R Roberts
- The Florey Institute of Neuroscience and Mental Health, The University of Melbourne , Parkville, Victoria 3010, Australia
| | - Anthony G Wedd
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne , Parkville, Victoria 3010, Australia
| | - Zhiguang Xiao
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne , Parkville, Victoria 3010, Australia.,The Florey Institute of Neuroscience and Mental Health, The University of Melbourne , Parkville, Victoria 3010, Australia
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Butterfield CN, Tebo BM. Substrate specificity and copper loading of the manganese-oxidizing multicopper oxidase Mnx from Bacillus sp. PL-12. Metallomics 2017; 9:183-191. [DOI: 10.1039/c6mt00239k] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Tripathi C, Mahato NK, Rani P, Singh Y, Kamra K, Lal R. Draft genome sequence of Lampropedia cohaerens strain CT6(T) isolated from arsenic rich microbial mats of a Himalayan hot water spring. Stand Genomic Sci 2016; 11:64. [PMID: 27610214 PMCID: PMC5015223 DOI: 10.1186/s40793-016-0179-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Accepted: 08/16/2016] [Indexed: 11/22/2022] Open
Abstract
Lampropedia cohaerens strain CT6T, a non-motile, aerobic and coccoid strain was isolated from arsenic rich microbial mats (temperature ~45 °C) of a hot water spring located atop the Himalayan ranges at Manikaran, India. The present study reports the first genome sequence of type strain CT6T of genus Lampropedia cohaerens. Sequencing data was generated using the Illumina HiSeq 2000 platform and assembled with ABySS v 1.3.5. The 3,158,922 bp genome was assembled into 41 contigs with a mean GC content of 63.5 % and 2823 coding sequences. Strain CT6T was found to harbour genes involved in both the Entner-Duodoroff pathway and non-phosphorylated ED pathway. Strain CT6T also contained genes responsible for imparting resistance to arsenic, copper, cobalt, zinc, cadmium and magnesium, providing survival advantages at a thermal location. Additionally, the presence of genes associated with biofilm formation, pyrroloquinoline-quinone production, isoquinoline degradation and mineral phosphate solubilisation in the genome demonstrate the diverse genetic potential for survival at stressed niches.
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Affiliation(s)
- Charu Tripathi
- Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007 India
| | - Nitish K Mahato
- Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007 India
| | - Pooja Rani
- Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007 India
| | - Yogendra Singh
- Department of Zoology, University of Delhi, Delhi, 110007 India
| | - Komal Kamra
- Ciliate Biology Laboratory, SGTB Khalsa College, University of Delhi, Delhi, 110007 India
| | - Rup Lal
- Molecular Biology Laboratory, Department of Zoology, University of Delhi, Delhi, 110007 India
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42
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Activity–stability relationships revisited in blue oxidases catalyzing electron transfer at extreme temperatures. Extremophiles 2016; 20:621-9. [DOI: 10.1007/s00792-016-0851-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 05/31/2016] [Indexed: 11/26/2022]
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Stolle P, Hou B, Brüser T. The Tat Substrate CueO Is Transported in an Incomplete Folding State. J Biol Chem 2016; 291:13520-8. [PMID: 27129241 DOI: 10.1074/jbc.m116.729103] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Indexed: 11/06/2022] Open
Abstract
In Escherichia coli, cytoplasmic copper ions are toxic to cells even at the lowest concentrations. As a defense strategy, the cuprous oxidase CueO is secreted into the periplasm to oxidize the more membrane-permeable and toxic Cu(I) before it can enter the cytoplasm. CueO itself is a multicopper oxidase that requires copper for activity. Because it is transported by the twin-arginine translocation (Tat) pathway, which transports folded proteins, a requirement for cofactor assembly before translocation has been discussed. Here we show that CueO is transported as an apo-protein. Periplasmic CueO was readily activated by the addition of copper ions in vitro or under copper stress conditions in vivo Cytoplasmic CueO did not contain copper, even under copper stress conditions. In vitro Tat transport proved that the cofactor assembly was not required for functional Tat transport of CueO. Due to the post-translocational activation of CueO, this enzyme contributes to copper resistance not only by its cuprous oxidase activity but also by chelation of copper ions before they can enter the cytoplasm. Apo-CueO was indistinguishable from holo-CueO in terms of secondary structural elements. Importantly, the binding of copper to apo-CueO greatly stabilized the protein, indicating a transformation from an open or flexible domain arrangement with accessible copper sites to a closed structure with deeply buried copper ions. CueO is thus the first example for a natural Tat substrate of such incomplete folding state. The Tat system may need to transport flexibly folded proteins in any case when cofactor assembly or quaternary structure formation occurs after transport.
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Affiliation(s)
- Patrick Stolle
- From the Institute of Microbiology, Leibniz Universität Hannover, Herrenhäuser Strasse 2, 30419 Hannover, Germany
| | - Bo Hou
- From the Institute of Microbiology, Leibniz Universität Hannover, Herrenhäuser Strasse 2, 30419 Hannover, Germany
| | - Thomas Brüser
- From the Institute of Microbiology, Leibniz Universität Hannover, Herrenhäuser Strasse 2, 30419 Hannover, Germany
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Zeng J, Zhu Q, Wu Y, Lin X. Oxidation of polycyclic aromatic hydrocarbons using Bacillus subtilis CotA with high laccase activity and copper independence. CHEMOSPHERE 2016; 148:1-7. [PMID: 26784443 DOI: 10.1016/j.chemosphere.2016.01.019] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 12/26/2015] [Accepted: 01/06/2016] [Indexed: 06/05/2023]
Abstract
Bacterial laccase CueO from Escherichia coli can oxidize polycyclic aromatic hydrocarbons (PAHs); however, its application in the remediation of PAH-contaminated soil mainly suffers from a low oxidation rate and copper dependence. It was reported that a laccase with a higher redox potential tended to have a higher oxidation rate; thus, the present study investigated the oxidation of PAHs using another bacterial laccase CotA from Bacillus subtilis with a higher redox potential (525 mV) than CueO (440 mV). Recombinant CotA was overexpressed in E. coli and partially purified, exhibiting a higher laccase-specific activity than CueO over a broad pH and temperature range. CotA exhibited moderate thermostability at high temperatures. CotA oxidized PAHs in the absence of exogenous copper. Thereby, secondary heavy metal pollution can be avoided, another advantage of CotA over CueO. Moreover, this study also evaluated some unexplained phenomena in our previous study. It was observed that the oxidation of PAHs with bacterial laccases can be promoted by copper. The partially purified bacterial laccase oxidized only two of the 15 tested PAHs, i.e., anthracene and benzo[a]pyrene, indicating the presence of natural redox mediators in crude cell extracts. Overall, the recombinant CotA oxidizes PAHs with high laccase activity and copper independence, indicating that CotA is a better candidate for the remediation of PAHs than CueO. Besides, the findings here provide a better understanding of the oxidation of PAHs using bacterial laccases.
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Affiliation(s)
- Jun Zeng
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71, Beijing East Road, Nanjing 210008, PR China; Joint Open Laboratory of Soil and the Environment, Hong Kong Baptist University and Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Qinghe Zhu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71, Beijing East Road, Nanjing 210008, PR China; Joint Open Laboratory of Soil and the Environment, Hong Kong Baptist University and Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Yucheng Wu
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71, Beijing East Road, Nanjing 210008, PR China; Joint Open Laboratory of Soil and the Environment, Hong Kong Baptist University and Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China
| | - Xiangui Lin
- State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, No. 71, Beijing East Road, Nanjing 210008, PR China; Joint Open Laboratory of Soil and the Environment, Hong Kong Baptist University and Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, PR China.
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Genetic basis and importance of metal resistant genes in bacteria for bioremediation of contaminated environments with toxic metal pollutants. Appl Microbiol Biotechnol 2016; 100:2967-84. [PMID: 26860944 DOI: 10.1007/s00253-016-7364-4] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Revised: 01/26/2016] [Accepted: 01/28/2016] [Indexed: 10/22/2022]
Abstract
Metal pollution is one of the most persistent and complex environmental issues, causing threat to the ecosystem and human health. On exposure to several toxic metals such as arsenic, cadmium, chromium, copper, lead, and mercury, several bacteria has evolved with many metal-resistant genes as a means of their adaptation. These genes can be further exploited for bioremediation of the metal-contaminated environments. Many operon-clustered metal-resistant genes such as cadB, chrA, copAB, pbrA, merA, and NiCoT have been reported in bacterial systems for cadmium, chromium, copper, lead, mercury, and nickel resistance and detoxification, respectively. The field of environmental bioremediation has been ameliorated by exploiting diverse bacterial detoxification genes. Genetic engineering integrated with bioremediation assists in manipulation of bacterial genome which can enhance toxic metal detoxification that is not usually performed by normal bacteria. These techniques include genetic engineering with single genes or operons, pathway construction, and alternations of the sequences of existing genes. However, numerous facets of bacterial novel metal-resistant genes are yet to be explored for application in microbial bioremediation practices. This review describes the role of bacteria and their adaptive mechanisms for toxic metal detoxification and restoration of contaminated sites.
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An improved Bathocuproine assay for accurate valence identification and quantification of copper bound by biomolecules. Anal Biochem 2015; 497:27-35. [PMID: 26743717 DOI: 10.1016/j.ab.2015.12.014] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 12/04/2015] [Accepted: 12/18/2015] [Indexed: 01/06/2023]
Abstract
Copper is an essential metal in all organisms. Reliably quantifying and identifying the copper content and oxidation state is crucial, since the information is essential to understanding protein structure and function. Chromophoric ligands, such as Bathocuproine (BC) and its water-soluble analog, Bathocuproinedisulfonic acid (BCS), preferentially bind Cu(I) over Cu(II), and therefore have been widely used as optical probes to determine the oxidation state of copper bound by biomolecules. However, the BCS assay is commonly misused, leading to erroneous conclusions regarding the role of copper in biological processes. By measuring the redox potential of Cu(II)-BCS2 and conducting UV-vis absorption measurements in the presence of oxidizable amino acids, the thermodynamic origin of the potential artifacts becomes evident. The BCS assay was improved by introducing a strong Cu(II) chelator EDTA prior to the addition of BCS to prevent interference that might arise from Cu(II) present in the sample. The strong Cu(II) chelator rids of all the potential errors inherent in the conventional BCS assay. Applications of the improved assay to peptides and protein containing oxidizable amino acid residues confirm that free Cu(II) no longer leads to artifacts, thereby resolving issues related to this persistently misused colorimetric assay of Cu(I) in biological systems.
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Characterization and structure prediction of partial length protein sequences of pcoA, pcoR and chrB genes from heavy metal resistant bacteria from the Klip River, South Africa. Int J Mol Sci 2015; 16:7352-74. [PMID: 25837632 PMCID: PMC4425021 DOI: 10.3390/ijms16047352] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Accepted: 03/05/2015] [Indexed: 12/27/2022] Open
Abstract
The Klip River has suffered from severe anthropogenic effects from industrial activities such as mining. Long-term exposure to heavy metal pollution has led to the development of heavy metal resistant strains of Pseudomonas sp. KR23, Lysinibacillus sp. KR25, and E. coli KR29. The objectives of this study were to characterize the genetics of copper and chromate resistance of the isolates. Copper and chromate resistance determinants were cloned and sequenced. Open reading frames (ORFs) related to the genes CopA and CopR were identified in E. coli KR29, PcoA in Lysinibacillus sp. KR25 and none related to chromate resistance were detected. The 3D-models predicted by I-TASSER disclose that the PcoA proteins consist of β-sheets, which form a part of the cupredoxin domain of the CopA copper resistance family of genes. The model for PcoR_29 revealed the presence of a helix turn helix; this forms part of a DNA binding protein, which is part of a heavy metal transcriptional regulator. The bacterial strains were cured using ethidium bromide. The genes encoding for heavy metal resistance and antibiotic resistance were found to be located on the chromosome for both Pseudomonas sp. (KR23) and E. coli (KR29). For Lysinibacillus (KR25) the heavy metal resistance determinants are suspected to be located on a mobile genetic element, which was not detected using gel electrophoresis.
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Martins LO, Durão P, Brissos V, Lindley PF. Laccases of prokaryotic origin: enzymes at the interface of protein science and protein technology. Cell Mol Life Sci 2015; 72:911-22. [PMID: 25572294 PMCID: PMC11113980 DOI: 10.1007/s00018-014-1822-x] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2014] [Accepted: 12/30/2014] [Indexed: 10/24/2022]
Abstract
The ubiquitous members of the multicopper oxidase family of enzymes oxidize a range of aromatic substrates such as polyphenols, methoxy-substituted phenols, amines and inorganic compounds, concomitantly with the reduction of molecular dioxygen to water. This family of enzymes can be broadly divided into two functional classes: metalloxidases and laccases. Several prokaryotic metalloxidases have been described in the last decade showing a robust activity towards metals, such as Cu(I), Fe(II) or Mn(II) and have been implicated in the metal metabolism of the corresponding microorganisms. Many laccases, with a superior efficiency for oxidation of organic compounds when compared with metals, have also been identified and characterized from prokaryotes, playing roles that more closely conform to those of intermediary metabolism. This review aims to present an update of current knowledge on prokaryotic multicopper oxidases, with a special emphasis on laccases, anticipating their enormous potential for industrial and environmental applications.
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Affiliation(s)
- Lígia O Martins
- Instituto de Tecnologia Química e Biológica, Universidade Nova de Lisboa, Av. da República, 2781-901, Oeiras, Portugal,
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Wijekoon CJK, Young TR, Wedd AG, Xiao Z. CopC Protein from Pseudomonas fluorescens SBW25 Features a Conserved Novel High-Affinity Cu(II) Binding Site. Inorg Chem 2015; 54:2950-9. [DOI: 10.1021/acs.inorgchem.5b00031] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Chathuri J. K. Wijekoon
- School
of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Tessa R. Young
- School
of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Anthony G. Wedd
- School
of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Zhiguang Xiao
- School
of Chemistry and Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia
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50
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Cortes L, Wedd AG, Xiao Z. The functional roles of the three copper sites associated with the methionine-rich insert in the multicopper oxidase CueO fromE. coli. Metallomics 2015; 7:776-85. [DOI: 10.1039/c5mt00001g] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The methionine-rich insert in the multicopper oxidase CueO fromE. coliaccommodates three copper sites that play distinct but related roles in Cu(i) extraction and oxidation and that induce robust cuprous oxidase activity under physiologically relevant conditions.
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Affiliation(s)
- Laura Cortes
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- ParkvilleAustralia
| | - Anthony G. Wedd
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- ParkvilleAustralia
| | - Zhiguang Xiao
- School of Chemistry and The Bio21 Molecular Science and Biotechnology Institute
- University of Melbourne
- ParkvilleAustralia
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