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Qin W, Guo S, Li Q, Tang A, Liu H, Liu Y. Biotransformation of the azo dye reactive orange 16 by Aspergillus flavus A5P1: Performance, genetic background, pathway, and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2024; 468:133562. [PMID: 38401208 DOI: 10.1016/j.jhazmat.2024.133562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 01/12/2024] [Accepted: 01/17/2024] [Indexed: 02/26/2024]
Abstract
This study reports the strain Aspergillus flavus A5P1 (A5P1), which is with the capable of degrading the azo dye reactive orange 16 (RO16). The mechanism of RO16 degradation by A5P1 was elucidated through genomic analysis, enzymatic analysis, degradation pathway analysis and oxidative stress analysis. Strain A5P1 exhibited aerobic degradation of RO16, with optimal degradation at an initial pH of 3.0. Genomic analysis indicates that strain A5P1 possesses the potential for acid tolerance and degradation of azo dye. Enzymatic analysis, combined with degradation product analysis, demonstrated that extracellular laccase, intracellular lignin peroxidase, and intracellular quinone reductase were likely key enzymes in the RO16 degradation process. Oxidative stress analysis revealed that cell stress responses may participate in the RO16 biotransformation process. The results indicated that the biotransformation of RO16 may involves biological processes such as transmembrane transport of RO16, cometabolism of the strain with RO16, and cell stress responses. These findings shed light on the biodegradation of RO16 by A5P1, indicating A5P1's potential for environmental remediation.
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Affiliation(s)
- Wen Qin
- College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China
| | - Shiqi Guo
- College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China
| | - Qingyun Li
- College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China; Key Laboratory of Guangxi Biorefinery, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China
| | - Aixing Tang
- College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China; Key Laboratory of Guangxi Biorefinery, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China
| | - Haibo Liu
- College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China
| | - Youyan Liu
- College of Chemistry and Chemical Engineering, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China; Key Laboratory of Guangxi Biorefinery, Guangxi University, 100 Daxue East Road, Nanning 530004, Guangxi, People's Republic of China.
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Tan C, Chen S, Zhang H, Ma Y, Qu Z, Yan N, Zhang Y, Rittmann BE. The roles of Rhodococcus ruber in denitrification with quinoline as the electron donor. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 902:166128. [PMID: 37562631 DOI: 10.1016/j.scitotenv.2023.166128] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2023] [Revised: 05/19/2023] [Accepted: 08/06/2023] [Indexed: 08/12/2023]
Abstract
Denitrification is an important step in domestic wastewater treatment, but providing bioavailable electron donors is an expense. However, some industrial wastewaters contain organic compounds that could be a no-cost or low-cost electron donor, because they otherwise must be treated separately. In this work, quinoline was used as an electron donor to drive denitrification through bioaugmentation with Rhodococcus ruber, which is able to biodegrade quinoline. When quinoline-acclimated biomass (QAB) was used for denitrification, addition of R. ruber accelerated biodegradation of quinoline and its first mono-oxygenation intermediate (2-hydroxyquinoline). Although R. ruber was not directly active in denitrification, its biodegradation of quinoline and 2-hydroxyquinoline supplied products that other bacteria used to respire nitrate. In contrast, glucose-acclimated biomass (GAB) could not achieve effective denitrification with quinoline, whether or not R. ruber was added. Analysis by high-throughout sequencing showed that genera Ignavibacterium, Ferruginibacter, Limnobacter, and Denitrosoma were important during quinoline biodegradation with denitrification by QAB. In summary, bioaugmented R. ruber and endogenous bacterial strains had complementary roles when biodegrading quinoline to enhance denitrification. The significance of this study is to enable the use of industrial wastewater to provide electron donor to drive denitrification.
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Affiliation(s)
- Chong Tan
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Songyun Chen
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Haiyun Zhang
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Yue Ma
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Zhengye Qu
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China
| | - Ning Yan
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China.
| | - Yongming Zhang
- Department of Environmental Engineering, School of Environmental and Geographical Science, Shanghai Normal University, Shanghai 200234, PR China.
| | - Bruce E Rittmann
- Biodesign Swette Center for Environmental Biotechnology, Arizona State University, Tempe, AZ 85287-5701, USA
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Pham VHT, Kim J, Chang S, Bang D. Investigating Bio-Inspired Degradation of Toxic Dyes Using Potential Multi-Enzyme Producing Extremophiles. Microorganisms 2023; 11:1273. [PMID: 37317247 DOI: 10.3390/microorganisms11051273] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 05/03/2023] [Accepted: 05/11/2023] [Indexed: 06/16/2023] Open
Abstract
Biological treatment methods overcome many of the drawbacks of physicochemical strategies and play a significant role in removing dye contamination for environmental sustainability. Numerous microorganisms have been investigated as promising dye-degrading candidates because of their high metabolic potential. However, few can be applied on a large scale because of the extremely harsh conditions in effluents polluted with multiple dyes, such as alkaline pH, high salinity/heavy metals/dye concentration, high temperature, and oxidative stress. Therefore, extremophilic microorganisms offer enormous opportunities for practical biodegradation processes as they are naturally adapted to multi-stress conditions due to the special structure of their cell wall, capsule, S-layer proteins, extracellular polymer substances (EPS), and siderophores structural and functional properties such as poly-enzymes produced. This review provides scientific information for a broader understanding of general dyes, their toxicity, and their harmful effects. The advantages and disadvantages of physicochemical methods are also highlighted and compared to those of microbial strategies. New techniques and methodologies used in recent studies are briefly summarized and discussed. In particular, this study addresses the key adaptation mechanisms, whole-cell, enzymatic degradation, and non-enzymatic pathways in aerobic, anaerobic, and combination conditions of extremophiles in dye degradation and decolorization. Furthermore, they have special metabolic pathways and protein frameworks that contribute significantly to the complete mineralization and decolorization of the dye when all functions are turned on. The high potential efficiency of microbial degradation by unculturable and multi-enzyme-producing extremophiles remains a question that needs to be answered in practical research.
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Affiliation(s)
- Van Hong Thi Pham
- Department of Environmental Energy Engineering, College of Creative Engineering of Kyonggi University, Suwon 16227, Republic of Korea
| | - Jaisoo Kim
- Department of Life Science, College of Natural Science of Kyonggi University, Suwon 16227, Republic of Korea
| | - Soonwoong Chang
- Department of Environmental Energy Engineering, College of Creative Engineering of Kyonggi University, Suwon 16227, Republic of Korea
| | - Donggyu Bang
- Department of Environmental Energy Engineering, Graduate School of Kyonggi University, Suwon 16227, Republic of Korea
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