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Murphy RM, Stanczyk JC, Huang F, Loewen ME, Yang TC, Loewen MC. Reduction of phenolics in faba bean meal using recombinantly produced and purified Bacillus ligniniphilus catechol 2,3-dioxygenase. BIORESOUR BIOPROCESS 2023; 10:13. [PMID: 36817019 PMCID: PMC9925492 DOI: 10.1186/s40643-023-00633-8] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 01/20/2023] [Indexed: 02/15/2023] Open
Abstract
Pulse meal should be a valuable product in the animal feed industry based on its strong nutritional and protein profiles. However, it contains anti-nutritional compounds including phenolics (large and small molecular weight), which must be addressed to increase uptake by the industry. Microbial fermentation is currently used as a strategy to decrease larger molecular weight poly-phenolics, but results in the undesirable accumulation of small mono-phenolics. Here, we investigate cell-free biocatalytic reduction of phenolic content in faba bean (Vicia faba L.) meal. A representative phenolic ring-breaking catechol dioxygenase, Bacillus ligniniphilus L1 catechol 2,3-dioxygenase (BLC23O) was used in this proof-of concept based on its known stability and broad substrate specificity. Initially, large-scale fermentative recombinant production and purification of BLC23O was carried out, with functionality validated by in vitro kinetic analysis. When applied to faba bean meal, BLC23O yielded greatest reductions in phenolic content in a coarse air classified fraction (high carbohydrate), compared to either a fine fraction (high protein) or the original unfractionated meal. However, the upstream hydrolytic release of phenolics from higher molecular weight species (e.g. tannins, or complexes with proteins and carbohydrates) likely remains a rate limiting step, in the absence of other enzymes or microbial fermentation. Consistent with this, when applied to a selection of commercially available purified phenolic compounds, known to occur in faba bean, BLC23O was found to have high activity against monophenolic acids and little if any detectable activity against larger molecular weight compounds. Overall, this study highlights the potential viability of the biocatalytic processing of pulse meals, for optimization of their nutritional and economical value in the animal feed industry. Graphical Abstract Supplementary Information The online version contains supplementary material available at 10.1186/s40643-023-00633-8.
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Affiliation(s)
- Rebecca M. Murphy
- grid.28046.380000 0001 2182 2255Department of Chemistry and Biomolecular Sciences, University of Ottawa, 150 Louis-Pasteur Pvt, Ottawa, ON K1N 6N5 Canada
| | - Joanna C. Stanczyk
- grid.24433.320000 0004 0449 7958Aquatic and Crop Resources Development Research Center, National Research Council of Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6 Canada
| | - Fang Huang
- grid.24433.320000 0004 0449 7958Aquatic and Crop Resources Development Research Center, National Research Council of Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6 Canada
| | - Matthew E. Loewen
- grid.25152.310000 0001 2154 235XDepartment of Veterinary Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, 52 Campus Drive, Saskatoon, SK S7N 5B4 Canada
| | - Trent C. Yang
- grid.24433.320000 0004 0449 7958Aquatic and Crop Resources Development Research Center, National Research Council of Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6 Canada
| | - Michele C. Loewen
- grid.28046.380000 0001 2182 2255Department of Chemistry and Biomolecular Sciences, University of Ottawa, 150 Louis-Pasteur Pvt, Ottawa, ON K1N 6N5 Canada ,grid.24433.320000 0004 0449 7958Aquatic and Crop Resources Development Research Center, National Research Council of Canada, 100 Sussex Drive, Ottawa, ON K1A 0R6 Canada
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Yang Y, Ghatge S, Ko Y, Yoon Y, Ahn JH, Kim JJ, Hur HG. Non-specific degradation of chloroacetanilide herbicides by glucose oxidase supported Bio-Fenton reaction. CHEMOSPHERE 2022; 292:133417. [PMID: 34954194 DOI: 10.1016/j.chemosphere.2021.133417] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Revised: 12/13/2021] [Accepted: 12/22/2021] [Indexed: 06/14/2023]
Abstract
Bio-Fenton reaction supported by glucose oxidase (GOx) for producing H2O2 was applied to degrade persistent chloroacetanilide herbicides in the presence of Fe (Ⅲ)-citrate at pH 5.5. There were pH decrease to 4.3, the production of 8 mM H2O2 and simultaneous consumption to produce •OH radicals which non-specifically degraded the herbicides. The degradation rates followed the order acetochlor ≈ alachlor ≈ metolachlor > propachlor ≈ butachlor with the degradation percent of 72.8%, 73.4%, 74.0%, 47.4%, and 43.8%, respectively. During the Bio-Fenton degradation, alachlor was dechlorinated and filtered into catechol via the production of intermediates formed through a series of hydrogen atom abstraction and hydrogen oxide radical addition reactions. The current Bio-Fenton reaction leading to the production of •OH radicals could be applied for non-specific oxidative degradation to various persistent organic pollutants under in-situ environmental conditions, considering diverse microbial metabolic systems able to continuously supply H2O2 with ubiquitous Fe(II) and Fe(III) and citrate.
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Affiliation(s)
- Youri Yang
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea
| | - Sunil Ghatge
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea
| | - Yongseok Ko
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea
| | - Younggun Yoon
- Bioremediation Team, National Institute of Agricultural Sciences, 166 Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Jae-Hyung Ahn
- Bioremediation Team, National Institute of Agricultural Sciences, 166 Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea
| | - Jeong Jun Kim
- Bioremediation Team, National Institute of Agricultural Sciences, 166 Nongsaengmyeong-ro, Iseo-myeon, Wanju-gun, Jeollabuk-do, 55365, Republic of Korea.
| | - Hor-Gil Hur
- School of Earth Sciences and Environmental Engineering, Gwangju Institute of Science and Technology (GIST), Gwangju, 61005, Republic of Korea.
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Four Aromatic Intradiol Ring Cleavage Dioxygenases from Aspergillus niger. Appl Environ Microbiol 2019; 85:AEM.01786-19. [PMID: 31540981 DOI: 10.1128/aem.01786-19] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Accepted: 09/13/2019] [Indexed: 11/20/2022] Open
Abstract
Ring cleavage dioxygenases catalyze the critical ring-opening step in the catabolism of aromatic compounds. The archetypal filamentous fungus Aspergillus niger previously has been reported to be able to utilize a range of monocyclic aromatic compounds as sole sources of carbon and energy. The genome of A. niger has been sequenced, and deduced amino acid sequences from a large number of gene models show various levels of similarity to bacterial intradiol ring cleavage dioxygenases, but no corresponding enzyme has been purified and characterized. Here, the cloning, heterologous expression, purification, and biochemical characterization of four nonheme iron(III)-containing intradiol dioxygenases (NRRL3_02644, NRRL3_04787, NRRL3_05330, and NRRL3_01405) from A. niger are reported. Purified enzymes were tested for their ability to cleave model catecholate substrates, and their apparent kinetic parameters were determined. Comparisons of k cat /Km values show that NRRL3_02644 and NRRL3_05330 are specific for hydroxyquinol (1,2,4-trihydroxybenzene), and phylogenetic analysis shows that these two enzymes are related to bacterial hydroxyquinol 1,2-dioxygenases. A high-activity catechol 1,2-dioxygenase (NRRL3_04787), which is phylogenetically related to other characterized and putative fungal catechol 1,2-dioxygenases, was also identified. The fourth enzyme (NRRL3_01405) appears to be a novel homodimeric Fe(III)-containing protocatechuate 3,4-dioxygenase that is phylogenetically distantly related to heterodimeric bacterial protocatechuate 3,4-dioxygenases. These investigations provide experimental evidence for the molecular function of these proteins and open the way to further investigations of the physiological roles for these enzymes in fungal metabolism of aromatic compounds.IMPORTANCE Aromatic ring opening using molecular oxygen is one of the critical steps in the degradation of aromatic compounds by microorganisms. While enzymes catalyzing this step have been well-studied in bacteria, their counterparts from fungi are poorly characterized despite the abundance of genes annotated as ring cleavage dioxygenases in fungal genomes. Aspergillus niger degrades a variety of aromatic compounds, and its genome harbors 5 genes encoding putative intracellular intradiol dioxygenases. The ability to predict the substrate specificities of the encoded enzymes from sequence data are limited. Here, we report the characterization of four purified intradiol ring cleavage dioxygenases from A. niger, revealing two hydroxyquinol-specific dioxygenases, a catechol dioxygenase, and a unique homodimeric protocatechuate dioxygenase. Their characteristics, as well as their phylogenetic relationships to predicted ring cleavage dioxygenases from other fungal species, provide insights into their molecular functions in aromatic compound metabolism by this fungus and other fungi.
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Benedek T, Táncsics A, Szabó I, Farkas M, Szoboszlay S, Fábián K, Maróti G, Kriszt B. Polyphasic analysis of an Azoarcus-Leptothrix-dominated bacterial biofilm developed on stainless steel surface in a gasoline-contaminated hypoxic groundwater. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:9019-9035. [PMID: 26825521 DOI: 10.1007/s11356-016-6128-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 01/18/2016] [Indexed: 06/05/2023]
Abstract
Pump and treat systems are widely used for hydrocarbon-contaminated groundwater remediation. Although biofouling (formation of clogging biofilms on pump surfaces) is a common problem in these systems, scarce information is available regarding the phylogenetic and functional complexity of such biofilms. Extensive information about the taxa and species as well as metabolic potential of a bacterial biofilm developed on the stainless steel surface of a pump submerged in a gasoline-contaminated hypoxic groundwater is presented. Results shed light on a complex network of interconnected hydrocarbon-degrading chemoorganotrophic and chemolitotrophic bacteria. It was found that besides the well-known hydrocarbon-degrading aerobic/facultative anaerobic biofilm-forming organisms (e.g., Azoarcus, Leptothrix, Acidovorax, Thauera, Pseudomonas, etc.), representatives of Fe(2+)-and Mn(2+)-oxidizing (Thiobacillus, Sideroxydans, Gallionella, Rhodopseudomonas, etc.) as well as of Fe(3+)- and Mn(4+)-respiring (Rhodoferax, Geobacter, Magnetospirillum, Sulfurimonas, etc.) bacteria were present in the biofilm. The predominance of β-Proteobacteria within the biofilm bacterial community in phylogenetic and functional point of view was revealed. Investigation of meta-cleavage dioxygenase and benzylsuccinate synthase (bssA) genes indicated that within the biofilm, Azoarcus, Leptothrix, Zoogloea, and Thauera species are most probably involved in intrinsic biodegradation of aromatic hydrocarbons. Polyphasic analysis of the biofilm shed light on the fact that subsurface microbial accretions might be reservoirs of novel putatively hydrocarbon-degrading bacterial species. Moreover, clogging biofilms besides their detrimental effects might supplement the efficiency of pump and treat systems.
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Affiliation(s)
- Tibor Benedek
- Regional University Center of Excellence in Environmental Industry, Szent István University, Páter K. u. 1, Gödöllő, 2100, Hungary
| | - András Táncsics
- Regional University Center of Excellence in Environmental Industry, Szent István University, Páter K. u. 1, Gödöllő, 2100, Hungary.
| | - István Szabó
- Department of Environmental Safety and Ecotoxicology, Szent István University, Páter K. u. 1, Gödöllő, 2100, Hungary
| | - Milán Farkas
- Department of Environmental Safety and Ecotoxicology, Szent István University, Páter K. u. 1, Gödöllő, 2100, Hungary
| | - Sándor Szoboszlay
- Department of Environmental Safety and Ecotoxicology, Szent István University, Páter K. u. 1, Gödöllő, 2100, Hungary
| | - Krisztina Fábián
- Department of Environmental Safety and Ecotoxicology, Szent István University, Páter K. u. 1, Gödöllő, 2100, Hungary
| | - Gergely Maróti
- Institute of Biochemistry, Biological Research Center of the Hungarian Academy of Sciences, Temesvári krt. 62., Szeged, 6726, Hungary
| | - Balázs Kriszt
- Department of Environmental Safety and Ecotoxicology, Szent István University, Páter K. u. 1, Gödöllő, 2100, Hungary
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Dobslaw D, Engesser KH. Degradation of toluene by ortho cleavage enzymes in Burkholderia fungorum FLU100. Microb Biotechnol 2014; 8:143-54. [PMID: 25130674 PMCID: PMC4321380 DOI: 10.1111/1751-7915.12147] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Accepted: 06/28/2014] [Indexed: 11/28/2022] Open
Abstract
Burkholderia fungorum FLU100 simultaneously oxidized any mixture of toluene, benzene and mono-halogen benzenes to (3-substituted) catechols with a selectivity of nearly 100%. Further metabolism occurred via enzymes of ortho cleavage pathways with complete mineralization. During the transformation of 3-methylcatechol, 4-carboxymethyl-2-methylbut-2-en-4-olide (2-methyl-2-enelactone, 2-ML) accumulated transiently, being further mineralized only after a lag phase of 2 h in case of cells pre-grown on benzene or mono-halogen benzenes. No lag phase, however, occurred after growth on toluene. Cultures inhibited by chloramphenicol after growth on benzene or mono-halogen benzenes were unable to metabolize 2-ML supplied externally, even after prolonged incubation. A control culture grown with toluene did not show any lag phase and used 2-ML as a substrate. This means that 2-ML is an intermediate of toluene degradation and converted by specific enzymes. The conversion of 4-methylcatechol as a very minor by-product of toluene degradation in strain FLU100 resulted in the accumulation of 4-carboxymethyl-4-methylbut-2-en-4-olide (4-methyl-2-enelactone, 4-ML) as a dead-end product, excluding its nature as a possible intermediate. Thus, 3-methylcyclohexa-3,5-diene-1,2-diol, 3-methylcatechol, 2-methyl muconate and 2-ML were identified as central intermediates of productive ortho cleavage pathways for toluene metabolism in B. fungorum FLU100.
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Affiliation(s)
- Daniel Dobslaw
- Department of Biological Waste Air Purification, Institute of Sanitary Engineering, Water Quality and Solid Waste Management, University of Stuttgart, Bandtäle 2, Stuttgart, D-70569, Germany
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Hatta T, Nakano O, Imai N, Takizawa N, Kiyohara H. Cloning and sequence analysis of hydroxyquinol 1,2-dioxygenase gene in 2,4,6-trichlorophenol-degrading Ralstonia pickettii DTP0602 and characterization of its product. J Biosci Bioeng 2005; 87:267-72. [PMID: 16232466 DOI: 10.1016/s1389-1723(99)80030-9] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/1998] [Accepted: 11/20/1998] [Indexed: 11/16/2022]
Abstract
A gene encoding hydroxyquinol 1,2-dioxygenase was cloned from 2,4,6-trichlorophenol-degrading Ralstonia (Pseudomonas) pickettii strain DTP0602. Cell-free extracts of Escherichia coli containing a cloned 1.4-kb StuI-XhoI DNA fragment of R. pickettii DTP0602 hydroxyquinol 1,2-dioxygenase converted hydroxyquinol into maleylacetate and also degraded 6-chlorohydroxyquinol. The 1.4-kb DNA fragment contained one open reading frame (designated hadC) composed of 948 nucleotides. The molecular mass of 34,591 deduced from the gene product (HadC) was in agreement with the size (35 kDa) of the purified HadC protein determined by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. The amino acid sequence of HadC exhibited high homology to that of the hydroxyquinol 1,2-dioxygenase of 2,4,5-trichlorophenoxyacetic acid-degrading Burkholderia cepacia AC1100 (Daubaras, D. L. et al., Appl. Environ. Microbiol., 61, 1279-1289, 1995). The active enzyme had a molecular mass of 68 kDa, suggesting that it is functional as a homodimer. The enzyme also catalyzed the oxidation of pyrogallol and 3-methylcatechol, possible intermediates in the degradation of 2,4,6-trichlorophenol, in addition to 6-chlorohydroxyquinol and hydroxyquinol. The dioxygenase catalyzed both ortho- and meta-cleavage of 3-methylcatechol.
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Affiliation(s)
- T Hatta
- Research Institute of Technology, Okayama University of Science, 401-1 Seki, Okayama 703-8232, Japan
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Biophysical investigation of bacterial aromatic extradiol dioxygenases involved in biodegradation processes. Coord Chem Rev 1995. [DOI: 10.1016/0010-8545(95)01149-j] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Davison AD, Csellner H, Karuso P, Veal DA. Synergistic growth of two members from a mixed microbial consortium growing on biphenyl. FEMS Microbiol Ecol 1994. [DOI: 10.1111/j.1574-6941.1994.tb00100.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Krug M, Straube G. Degradation of phenolic compounds by the yeast Candida tropicalis HP 15. II. Some properties of the first two enzymes of the degradation pathway. J Basic Microbiol 1986; 26:271-81. [PMID: 3783431 DOI: 10.1002/jobm.3620260505] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The first two enzymes of the phenol degradation pathway were determined and characterized in crude extracts from Candida tropicalis HP 15. The phenol hydroxylase (EC 1.14.13.7) was a stable NADPH2- and FAD-dependent enzyme with a pH-optimum of 7.6 to 8.0 and a broad substrate specificity. Influence of ultrasound rapidly reduced the enzyme activity. The catechol 1,2-oxygenase (EC 1.13.1.1) had a broad pH-optimum between 7.5 and 9.6 and a limited substrate specificity. Two active protein bands indicating the presence of two isofunctional enzymes were detectable after electrophoretic separation of crude and partially purified extracts on polyacrylamide gels and specific staining for catechol 1,2-oxygenase activity.
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Groseclose EE, Ribbons DW. Metabolism of resorcinylic compounds by bacteria: new pathway for resorcinol catabolism in Azotobacter vinelandii. J Bacteriol 1981; 146:460-6. [PMID: 7217008 PMCID: PMC216987 DOI: 10.1128/jb.146.2.460-466.1981] [Citation(s) in RCA: 35] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
We present evidence to document a third pathway for the microbial catabolism of resorcinol. Resorcinol is converted to pyrogallol by resorcinol-grown cells of Azotobacter vinelandii. Pyrogallol is the substrate for one of two ring cleavage enzymes induced by growth with resorcinol. Oxalocrotonate, CO2, pyruvate, and acetaldehyde have been identified as products of pyrogallol oxidation catalyzed by extracts of resorcinol-grown cells. The enzymes pyrogallol 1,2-dioxygenase, oxalocrotonate tautomerase (isomerase), oxalocrotonate decarboxylase, and vinylpyruvate hydratase are present in extracts from resorcinol-grown cells but not in succinate-grown cells.
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Saeki Y, Nozaki M, Senoh S. Cleavage of pyrogallol by non-heme iron-containing dioxygenases. J Biol Chem 1980. [DOI: 10.1016/s0021-9258(18)43519-3] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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