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Limcharoensuk T, Chusuth P, Utaisincharoen P, Auesukaree C. Protein quality control systems in the endoplasmic reticulum and the cytosol coordinately prevent alachlor-induced proteotoxic stress in Saccharomyces cerevisiae. JOURNAL OF HAZARDOUS MATERIALS 2024; 471:134270. [PMID: 38640676 DOI: 10.1016/j.jhazmat.2024.134270] [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: 02/16/2024] [Revised: 04/05/2024] [Accepted: 04/09/2024] [Indexed: 04/21/2024]
Abstract
Alachlor, a widely used chloroacetanilide herbicide for controlling annual grasses in crops, has been reported to rapidly trigger protein denaturation and aggregation in the eukaryotic model organism Saccharomyces cerevisiae. Therefore, this study aimed to uncover cellular mechanisms involved in preventing alachlor-induced proteotoxicity. The findings reveal that the ubiquitin-proteasome system (UPS) plays a crucial role in eliminating alachlor-denatured proteins by tagging them with polyubiquitin for subsequent proteasomal degradation. Exposure to alachlor rapidly induced an inhibition of proteasome activity by 90 % within 30 min. The molecular docking analysis suggests that this inhibition likely results from the binding of alachlor to β subunits within the catalytic core of the proteasome. Notably, our data suggest that nascent proteins in the endoplasmic reticulum (ER) are the primary targets of alachlor. Consequently, the unfolded protein response (UPR), responsible for coping with aberrant proteins in the ER, becomes activated within 1 h of alachlor treatment, leading to the splicing of HAC1 mRNA into the active transcription activator Hac1p and the upregulation of UPR gene expression. These findings underscore the critical roles of the protein quality control systems UPS and UPR in mitigating alachlor-induced proteotoxicity by degrading alachlor-denatured proteins and enhancing the protein folding capacity of the ER.
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Affiliation(s)
- Tossapol Limcharoensuk
- Department of Biology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Phakawat Chusuth
- Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Pongsak Utaisincharoen
- Department of Microbiology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand
| | - Choowong Auesukaree
- Mahidol University-Osaka University Collaborative Research Center for Bioscience and Biotechnology (MU-OU:CRC), Faculty of Science, Mahidol University, Bangkok 10400, Thailand; Department of Biotechnology, Faculty of Science, Mahidol University, Bangkok 10400, Thailand.
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Witek W, Sliwiak J, Rawski M, Ruszkowski M. Targeting imidazole-glycerol phosphate dehydratase in plants: novel approach for structural and functional studies, and inhibitor blueprinting. FRONTIERS IN PLANT SCIENCE 2024; 15:1343980. [PMID: 38559763 PMCID: PMC10978614 DOI: 10.3389/fpls.2024.1343980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/24/2023] [Accepted: 03/04/2024] [Indexed: 04/04/2024]
Abstract
The histidine biosynthetic pathway (HBP) is targeted for herbicide design with preliminary success only regarding imidazole-glycerol phosphate dehydratase (IGPD, EC 4.2.1.19), or HISN5, as referred to in plants. HISN5 catalyzes the sixth step of the HBP, in which imidazole-glycerol phosphate (IGP) is dehydrated to imidazole-acetol phosphate. In this work, we present high-resolution cryoEM and crystal structures of Medicago truncatula HISN5 (MtHISN5) in complexes with an inactive IGP diastereoisomer and with various other ligands. MtHISN5 can serve as a new model for plant HISN5 structural studies, as it enables resolving protein-ligand interactions at high (2.2 Å) resolution using cryoEM. We identified ligand-binding hotspots and characterized the features of plant HISN5 enzymes in the context of the HISN5-targeted inhibitor design. Virtual screening performed against millions of small molecules not only revealed candidate molecules but also identified linkers for fragments that were experimentally confirmed to bind. Based on experimental and computational approaches, this study provides guidelines for designing symmetric HISN5 inhibitors that can reach two neighboring active sites. Finally, we conducted analyses of sequence similarity networks revealing that plant HISN5 enzymes derive from cyanobacteria. We also adopted a new approach to measure MtHISN5 enzymatic activity using isothermal titration calorimetry and enzymatically synthesized IGP.
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Affiliation(s)
- Wojciech Witek
- Department of Structural Biology of Eukaryotes, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland
| | - Joanna Sliwiak
- Department of Structural Biology of Eukaryotes, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland
| | - Michal Rawski
- Cryo-EM Facility, SOLARIS National Synchrotron Radiation Centre, Krakow, Poland
| | - Milosz Ruszkowski
- Department of Structural Biology of Eukaryotes, Institute of Bioorganic Chemistry, Polish Academy of Sciences, Poznan, Poland
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Zhou Y, Li Q, Zhang Q, Yuan M, Zhu X, Li Y, Li Q, Downs CA, Huang D, Chou LM, Zhao H. Environmental Concentrations of Herbicide Prometryn Render Stress-Tolerant Corals Susceptible to Ocean Warming. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:4545-4557. [PMID: 38386019 DOI: 10.1021/acs.est.3c10417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Global warming has caused the degradation of coral reefs around the world. While stress-tolerant corals have demonstrated the ability to acclimatize to ocean warming, it remains unclear whether they can sustain their thermal resilience when superimposed with other coastal environmental stressors. We report the combined impacts of a photosystem II (PSII) herbicide, prometryn, and ocean warming on the stress-tolerant coral Galaxea fascicularis through physiological and omics analyses. The results demonstrate that the heat-stress-induced inhibition of photosynthetic efficiency in G. fascicularis is exacerbated in the presence of prometryn. Transcriptomics and metabolomics analyses indicate that the prometryn exposure may overwhelm the photosystem repair mechanism in stress-tolerant corals, thereby compromising their capacity for thermal acclimation. Moreover, prometryn might amplify the adverse effects of heat stress on key energy and nutrient metabolism pathways and induce a stronger response to oxidative stress in stress-tolerant corals. The findings indicate that the presence of prometryn at environmentally relevant concentrations would render corals more susceptible to heat stress and exacerbate the breakdown of coral Symbiodiniaceae symbiosis. The present study provides valuable insights into the necessity of prioritizing PSII herbicide pollution reduction in coral reef protection efforts while mitigating the effects of climate change.
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Affiliation(s)
- Yanyu Zhou
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
- Center for Eco-Environment Restoration of Hainan Province & Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Environment and Ecology, Hainan University, Haikou 570228, China
| | - Qiuli Li
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
- Center for Eco-Environment Restoration of Hainan Province & Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Environment and Ecology, Hainan University, Haikou 570228, China
| | - Quan Zhang
- Key Laboratory of Microbial Technology for Industrial Pollution Control of Zhejiang Province, College of Environment, Zhejiang University of Technology, Hangzhou 310032, China
| | - Meile Yuan
- Center for Eco-Environment Restoration of Hainan Province & Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Environment and Ecology, Hainan University, Haikou 570228, China
| | - Xiaoshan Zhu
- Center for Eco-Environment Restoration of Hainan Province & Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Environment and Ecology, Hainan University, Haikou 570228, China
| | - Yuanchao Li
- Hainan Academy of Ocean and Fisheries Sciences, Haikou 571126, China
| | - Qipei Li
- Center for Eco-Environment Restoration of Hainan Province & Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Environment and Ecology, Hainan University, Haikou 570228, China
| | - Craig A Downs
- Haereticus Environmental Laboratory, P.O. Box 92, Clifford, Virginia 24533, United States
| | - Danwei Huang
- Lee Kong Chian Natural History Museum, National University of Singapore, Singapore 117377, Singapore
- Tropical Marine Science Institute, National University of Singapore, Singapore 119227, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore
| | - Loke-Ming Chou
- Tropical Marine Science Institute, National University of Singapore, Singapore 119227, Singapore
- Department of Biological Sciences, National University of Singapore, Singapore 117558, Singapore
| | - Hongwei Zhao
- State Key Laboratory of Marine Resource Utilization in South China Sea, Hainan University, Haikou 570228, China
- Center for Eco-Environment Restoration of Hainan Province & Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province, School of Environment and Ecology, Hainan University, Haikou 570228, China
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Li Q, Fu D, Zhou Y, Li Y, Chen L, Wang Z, Wan Y, Huang Z, Zhao H. Individual and combined effects of herbicide prometryn and nitrate enrichment at environmentally relevant concentrations on photosynthesis, oxidative stress, and endosymbiont community diversity of coral Acropora hyacinthus. CHEMOSPHERE 2023; 339:139729. [PMID: 37543226 DOI: 10.1016/j.chemosphere.2023.139729] [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: 11/18/2022] [Revised: 04/30/2023] [Accepted: 08/02/2023] [Indexed: 08/07/2023]
Abstract
Nitrogen pollution and pesticides such as photosystem II (PSII) inhibitor herbicides have several detrimental impacts on coral reefs, including breakdown of the symbiosis between host corals and photosynthetic symbionts. Although nitrogen and PSII herbicide pollution separately cause coral bleaching, the combined effects of these stressors at environmentally relevant concentrations on corals have not been assessed. Here, we report the combined effects of nitrate enrichment and PSII herbicide (prometryn) exposure on photosynthesis, oxidative status and endosymbiont community diversity of the reef-building coral Acropora hyacinthus. Coral fragments were exposed in a mesocosm system to nitrate enrichment (9 μmol/L) and two prometryn concentrations (1 and 5 μg/L). The results showed that sustained prometryn exposure in combination with nitrate enrichment stress had significant detrimental impacts on photosynthetic apparatus [the maximum quantum efficiency of photosystem II (Fv/Fm), nonphotochemical quenching (NPQ) and oxidative status in the short term. Nevertheless, the adaptive mechanism of corals allowed the normal physiological state to be recovered following 1 μg/L prometryn and 9 μmol/L nitrate enrichment individual exposure. Moreover, exposure for 9 days was insufficient to trigger a shift in Symbiodiniaceae community. Most importantly, the negative impact of exposure to the combined environmental concentrations of 1 μg/L prometryn and 9 μmol/L nitrate enrichment was found to be significantly greater on the Fv/Fm, quantum yield of non-regulated energy dissipation [Y(NO)], NPQ, and oxidative status of corals compared to the impact of individual stressors. Our results show that interactions between prometryn stress and nitrate enrichment have a synergistic impact on the photosynthetic and oxidative stress responses of corals. This study provides valuable insights into combined effects of nitrate enrichment and PSII herbicides pollution for coral's physiology. Environmental concentrations of PSII herbicides may be more harmful to photosystems and antioxidant systems of corals under nitrate enrichment stress. Thus, future research and management of seawater quality stressors should consider combined impacts on corals rather than just the impacts of individual stressors alone.
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Affiliation(s)
- Qiuli Li
- State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou, 570228, China; Haikou Marine Geological Survey Center, China Geological Survey, Haikou, 571127, China; Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province & Center for Eco-Environment Restoration of Hainan Province, College of Ecology and Environment, Hainan University, Haikou, 570228, China
| | - Dinghui Fu
- Haikou Marine Geological Survey Center, China Geological Survey, Haikou, 571127, China
| | - Yanyu Zhou
- State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou, 570228, China; Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province & Center for Eco-Environment Restoration of Hainan Province, College of Ecology and Environment, Hainan University, Haikou, 570228, China
| | - Yuanchao Li
- Hainan Academy of Ocean and Fisheries Sciences, Haikou, 571126, China
| | - Liang Chen
- Haikou Marine Geological Survey Center, China Geological Survey, Haikou, 571127, China
| | - Zhaofan Wang
- Haikou Marine Geological Survey Center, China Geological Survey, Haikou, 571127, China
| | - Yinglang Wan
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Zanhui Huang
- Haikou Marine Geological Survey Center, China Geological Survey, Haikou, 571127, China.
| | - Hongwei Zhao
- State Key Laboratory of Marine Resources Utilization in South China Sea, Hainan University, Haikou, 570228, China; Key Laboratory of Agro-Forestry Environmental Processes and Ecological Regulation of Hainan Province & Center for Eco-Environment Restoration of Hainan Province, College of Ecology and Environment, Hainan University, Haikou, 570228, China.
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Luo X, Wang C, Huang G, Tan Y, Tang W, Kong J, Li Z. Bio-inspired chitosan aerogel decorated with MOF-on-COF heterostructure hybrid as recyclable scavenger of herbicides in water. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.121616] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Laicher D, Benkendorff K, White S, Conrad S, Woodrow RL, Butcherine P, Sanders CJ. Pesticide occurrence in an agriculturally intensive and ecologically important coastal aquatic system in Australia. MARINE POLLUTION BULLETIN 2022; 180:113675. [PMID: 35642798 DOI: 10.1016/j.marpolbul.2022.113675] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 04/15/2022] [Accepted: 04/16/2022] [Indexed: 06/15/2023]
Abstract
Coastal agricultural practices are often located in catchments upstream of ecologically important aquatic systems. Here, we investigate the occurrence of pesticides in a coastal creek flowing into a habitat-protected area within the Solitary Islands Marine Park, Australia. Water samples were collected from six sites along a creek transect during three sampling periods. Samples were analysed for 171 pesticide analytes, including organochlorines, organophosphates, herbicides, and fungicides. Five insecticides, two herbicides, and two fungicides were detected. The neonicotinoid imidacloprid was detected at 5 out of 6 sites, with concentrations reaching 294 μg L-1, the highest yet detected in Australian waterways. The organophosphate insecticide dimethoate was detected at 4 sites, which occurred at the 2nd highest detected concentration in the study (12.8 μg L-1). The presence of these pesticides in the aquatic environment downstream of horticulture in this and other regions may have serious implications for stream biota and ecologically important marine ecosystems.
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Affiliation(s)
- Dylan Laicher
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia.
| | - Kirsten Benkendorff
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia
| | - Shane White
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia
| | - Steve Conrad
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia
| | - Rebecca L Woodrow
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia
| | - Peter Butcherine
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia
| | - Christian J Sanders
- National Marine Science Centre, Faculty of Science and Engineering, Southern Cross University, Coffs Harbour, NSW, Australia
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