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Cheng Q, Du L, Xu L, Zhao Y, Ma J, Lin H. Toxicity alleviation and metabolism enhancement of nonylphenol in green algae Dictyosphaerium sp. by NaHCO 3. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 848:157698. [PMID: 35908712 DOI: 10.1016/j.scitotenv.2022.157698] [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: 03/28/2022] [Revised: 07/07/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Nonylphenol (NP) toxicity limits the improvements in its algal remediation efficiency. This study comprehensively investigated the performance and mechanism of NaHCO3-driving effects on NP-exposed algae. The results showed that NaHCO3 enhanced algal resistance to NP and the corresponding EC50 values increased 1.31-4.25 times. Further, the toxicological effects of NP reduced with increasing pyrenoid volume and chlorophyll and carotenoids production, and decreasing cellular damage degree. Moreover, the concentration of extracellular polymeric substances was enhanced and more NP adsorption sites were formed. Consistently, RNA-seq demonstrated significant expression alterations in genes related to energy metabolism, cellular synthesis, photosynthesis, and carbon fixation. Besides, NP biodegradation rate was increased by 15.2 % and 11.1 % in the 1, and 4 mg/L NP treatments, respectively. Identification of degradation intermediates and their toxicity via Ecological Structure Activity Relationship program showed that NaHCO3 accelerated sequential α-C removal from NP in algae with faster generation of less toxic metabolites, namely, 4-ethylphenol, 4-cresol and 4-hydroxybenzoic acid. This study provides new insights into the role of NaHCO3 in toxicity alleviation and metabolism enhancement of NP in algae and can assist NP bioremediation efforts in aquatic environment.
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Affiliation(s)
- Qilu Cheng
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, The Institute of Environment, Resource, Soil and Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Linna Du
- Department of Agriculture and Biotechnology, Wenzhou Vocational College of Science and Technology, Wenzhou 325006, China
| | - Ligen Xu
- College of Agriculture and Biotechnology, Zhejiang University, Hangzhou 310058, China
| | - Yuhua Zhao
- College of Life Sciences, Zhejiang University, Hangzhou 310058, China
| | - Junwei Ma
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, The Institute of Environment, Resource, Soil and Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Hui Lin
- State Key Laboratory for Managing Biotic and Chemical Threats to the Quality and Safety of Agro-products, The Institute of Environment, Resource, Soil and Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China.
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3
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Shukshina AK, Terentyev VV. Involvement of Carbonic Anhydrase CAH3 in the Structural and Functional Stabilization of the Water-Oxidizing Complex of Photosystem II from Chlamydomonas reinhardtii. BIOCHEMISTRY (MOSCOW) 2021; 86:867-877. [PMID: 34284710 DOI: 10.1134/s0006297921070075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
The involvement of carbonic anhydrases (CA) and CA activity in the functioning of photosystem II (PSII) has been studied for a long time and has been shown in many works. However, so far only for CAH3 from Chlamydomonas reinhardtii there is evidence for its association with the donor side of PSII, where the CA activity of CAH3 can influence the functioning of the water-oxidizing complex (WOC). Our results suggest that CAH3 is also involved in the organization of the native structure of WOC independently of its CA activity. It was shown that in PSII preparations from wild type (WT) the high O2-evolving activity of WOC was observed up to 100 mM NaCl in the medium and practically did not decrease with increasing incubation time with NaCl. At the same time, the WOC function in PSII preparations from CAH3-deficient mutant cia3 is significantly inhibited already at NaCl concentrations above 35 mM, reaching 50% at 100 mM NaCl and increased incubation time. It is suggested that the absence of CAH3 in PSII from cia3 causes disruption of the native structure of WOC, allowing more pronounced conformational changes of its proteins and, consequently, suppression of the WOC active center function, when the ionic strength of the medium is increased. The results of Western blot analysis indicate a more difficult removal of PsbP protein from PSII of cia3 at higher NaCl concentrations, apparently due to the changes in the intermolecular interactions between proteins of WOC in the absence of CAH3. At the same time, the values of the maximum quantum yield of PSII did not practically differ between preparations from WT and cia3, indicating no effect of CAH3 on the photoinduced electron transfer in the reaction center of PSII. The obtained results indicate the involvement of the CAH3 protein in the native organization of the WOC and, as a consequence, in the stabilization of its functional state in PSII from C. reinhardtii.
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Affiliation(s)
- Anna K Shukshina
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia
| | - Vasily V Terentyev
- Institute of Basic Biological Problems, Pushchino Scientific Center for Biological Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia.
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4
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Cui H, Chen B, Jiang Y, Tao Y, Zhu X, Cai Z. Toxicity of 17 Disinfection By-products to Different Trophic Levels of Aquatic Organisms: Ecological Risks and Mechanisms. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:10534-10541. [PMID: 34132094 DOI: 10.1021/acs.est.0c08796] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Intensified disinfection of wastewater during the COVID-19 pandemic increased the release of toxic disinfection by-products (DBPs). However, studies relating to the ecological impacts of DBPs on the aquatic environment remain insufficient. In this study, we comparatively investigated the toxicities and ecological risks of 17 typical, halogenated DBPs to three trophic levels of organisms in the freshwater ecosystem, including phytoplankton (Scenedesmus sp.), zooplankton (Daphnia magna), and fish (Danio rerio). Toxicity of DBPs was found to be species-specific: Scenedesmus sp. was the most sensitive to haloacetic acids, while D. magna was the most sensitive to haloacetonitriles and trihalomethanes. Specific to each DBP, toxicities were also related to their classes and substituted halogen atoms. Damage to photosystems and oxidative stress served as the potential mechanisms for DBPs toxicity to microalgae. The different sensitivities to DBPs indicate that a battery of bioassays with organisms at different trophic levels is necessary to determine the ecotoxicity of DBPs. Furthermore, the ecological risks of DBPs were assessed by calculating the risk quotients (RQs) based on toxicity data from multiple bioassays. The cumulative RQs of DBPs to all the organisms were greater than 1.0, indicating high ecological risks of DBPs in wastewater effluents.
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Affiliation(s)
- Huijun Cui
- State Key Laboratory of Urban Water Resource and Environment of Harbin Institute of Technology, Shenzhen 518055, P. R. China
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, P. R. China
| | - Baiyang Chen
- State Key Laboratory of Urban Water Resource and Environment of Harbin Institute of Technology, Shenzhen 518055, P. R. China
| | - Yuelu Jiang
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, P. R. China
| | - Yi Tao
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, P. R. China
| | - Xiaoshan Zhu
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, P. R. China
| | - Zhonghua Cai
- Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, P. R. China
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8
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Liu H, Guo S, Lu M, Zhang Y, Li J, Wang W, Wang P, Zhang J, Hu Z, Li L, Si L, Zhang J, Qi Q, Jiang X, Botella JR, Wang H, Song CP. Biosynthesis of DHGA 12 and its roles in Arabidopsis seedling establishment. Nat Commun 2019; 10:1768. [PMID: 30992454 PMCID: PMC6467921 DOI: 10.1038/s41467-019-09467-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Accepted: 03/13/2019] [Indexed: 11/12/2022] Open
Abstract
Seed germination and photoautotrophic establishment are controlled by the antagonistic activity of the phytohormones gibberellins (GAs) and abscisic acid (ABA). Here we show that Arabidopsis thaliana GAS2 (Gain of Function in ABA-modulated Seed Germination 2), a protein belonging to the Fe-dependent 2-oxoglutarate dioxygenase superfamily, catalyzes the stereospecific hydration of GA12 to produce GA12 16, 17-dihydro-16α-ol (DHGA12). We show that DHGA12, a C20-GA has an atypical structure compared to known active GAs but can bind to the GA receptor (GID1c). DHGA12 can promote seed germination, hypocotyl elongation and cotyledon greening. Silencing and over-expression of GAS2 alters the ABA/GA ratio and sensitivity to ABA during seed germination and photoautotrophic establishment. Hence, we propose that GAS2 acts to modulate hormonal balance during early seedling development. Gibberellins are a major class of phytohormones that regulate plant growth and development. Here the authors show that the Arabidopsis GAS2 protein catalyses production of DHGA12, an atypical bioactive GA, and show that GAS2 regulates ABA sensitivity during seed germination and early development.
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Affiliation(s)
- Hao Liu
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Siyi Guo
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Minghua Lu
- College of Chemistry and Chemical Engineering, Henan University, 475004, Kaifeng, China
| | - Yu Zhang
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Junhua Li
- College of Life Sciences, Henan Normal University, 453007, Xinxiang, China
| | - Wei Wang
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Pengtao Wang
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Junli Zhang
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Zhubing Hu
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Liangliang Li
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Lingyu Si
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Jie Zhang
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China
| | - Qi Qi
- College of Biological Sciences and Biotechnology, Beijing Forestry University, 100083, Beijing, China
| | - Xiangning Jiang
- College of Biological Sciences and Biotechnology, Beijing Forestry University, 100083, Beijing, China
| | - José Ramón Botella
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.,Plant Genetic Engineering Laboratory, School of Agriculture and Food Sciences, The University of Queensland, Brisbane, QLD, 4072, Australia
| | - Hua Wang
- Engineering Research Center for Nanomaterials, Henan University, 475004, Kaifeng, China
| | - Chun-Peng Song
- Key Laboratory of Plant Stress Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China. .,State Key Laboratory of Cotton Biology, School of Life Sciences, Henan University, 475004, Kaifeng, China.
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Yamano T, Toyokawa C, Fukuzawa H. High-resolution suborganellar localization of Ca 2+-binding protein CAS, a novel regulator of CO 2-concentrating mechanism. PROTOPLASMA 2018; 255:1015-1022. [PMID: 29372336 DOI: 10.1007/s00709-018-1208-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 01/10/2018] [Indexed: 05/19/2023]
Abstract
Many aquatic algae induce a CO2-concentrating mechanism (CCM) associated with active inorganic carbon transport to maintain high photosynthetic affinity using dissolved inorganic carbon even in low-CO2 (LC) conditions. In the green alga Chlamydomonas reinhardtii, a Ca2+-binding protein CAS was identified as a novel factor regulating the expression of CCM-related proteins including bicarbonate transporters. Although previous studies revealed that CAS associates with the thylakoid membrane and changes its localization in response to CO2 and light availability, its detailed localization in the chloroplast has not been examined in vivo. In this study, high-resolution fluorescence images of CAS fused with a Chlamydomonas-adapted fluorescence protein, Clover, were obtained by using a sensitive hybrid detector and an image deconvolution method. In high-CO2 (5% v/v) conditions, the fluorescence signals of Clover displayed a mesh-like structure in the chloroplast and part of the signals discontinuously overlapped with chlorophyll autofluorescence. The fluorescence signals gathered inside the pyrenoid as a distinct wheel-like structure at 2 h after transfer to LC-light condition, and then localized to the center of the pyrenoid at 12 h. These results suggest that CAS could move in the chloroplast along the thylakoid membrane in response to lowering CO2 and gather inside the pyrenoid during the operation of the CCM.
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Affiliation(s)
- Takashi Yamano
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Chihana Toyokawa
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan
| | - Hideya Fukuzawa
- Graduate School of Biostudies, Kyoto University, Kyoto, 606-8502, Japan.
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10
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Caspari OD, Meyer MT, Tolleter D, Wittkopp TM, Cunniffe NJ, Lawson T, Grossman AR, Griffiths H. Pyrenoid loss in Chlamydomonas reinhardtii causes limitations in CO2 supply, but not thylakoid operating efficiency. JOURNAL OF EXPERIMENTAL BOTANY 2017; 68:3903-3913. [PMID: 28911055 PMCID: PMC5853600 DOI: 10.1093/jxb/erx197] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The pyrenoid of the unicellular green alga Chlamydomonas reinhardtii is a microcompartment situated in the centre of the cup-shaped chloroplast, containing up to 90% of cellular Rubisco. Traversed by a network of dense, knotted thylakoid tubules, the pyrenoid has been proposed to influence thylakoid biogenesis and ultrastructure. Mutants that are unable to assemble a pyrenoid matrix, due to expressing a vascular plant version of the Rubisco small subunit, exhibit severe growth and photosynthetic defects and have an ineffective carbon-concentrating mechanism (CCM). The present study set out to determine the cause of photosynthetic limitation in these pyrenoid-less lines. We tested whether electron transport and light use were compromised as a direct structural consequence of pyrenoid loss or as a metabolic effect downstream of lower CCM activity and resulting CO2 limitation. Thylakoid organization was unchanged in the mutants, including the retention of intrapyrenoid-type thylakoid tubules, and photosynthetic limitations associated with the absence of the pyrenoid were rescued by exposing cells to elevated CO2 levels. These results demonstrate that Rubisco aggregation in the pyrenoid functions as an essential element for CO2 delivery as part of the CCM, and does not play other roles in maintenance of photosynthetic membrane energetics.
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Affiliation(s)
- Oliver D Caspari
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, UK
- Correspondence:
| | - Moritz T Meyer
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, UK
| | - Dimitri Tolleter
- Department of Plant Biology, Carnegie Institution for Science, Stanford, CA, USA
| | - Tyler M Wittkopp
- Department of Plant Biology, Carnegie Institution for Science, Stanford, CA, USA
- Department of Biology, Stanford University, Stanford, CA, USA
| | - Nik J Cunniffe
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, UK
| | - Tracy Lawson
- School of Biological Sciences, University of Essex, Wivenhoe Park, Colchester, UK
| | - Arthur R Grossman
- Department of Plant Biology, Carnegie Institution for Science, Stanford, CA, USA
| | - Howard Griffiths
- Department of Plant Sciences, University of Cambridge, Downing Street, Cambridge, UK
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