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  1. Article ; Online: Biodegradation of sulfoxaflor and photolysis of sulfoxaflor by ultraviolet radiation.

    Zhao, Yun-Xiu / Chen, Ke-Xin / Wang, Li / Yuan, Pan-Pan / Dai, Yi-Jun

    Biodegradation

    2023  Volume 34, Issue 4, Page(s) 341–355

    Abstract: Sulfoxaflor (SUL, [N-[methyloxido[1-[6-(trifluoromethyl)-3-pyridinyl] ethyl]- ... ...

    Abstract Sulfoxaflor (SUL, [N-[methyloxido[1-[6-(trifluoromethyl)-3-pyridinyl] ethyl]-λ
    MeSH term(s) Ultraviolet Rays ; Photolysis ; Insecticides/chemistry ; Insecticides/metabolism ; Biodegradation, Environmental
    Chemical Substances sulfoxaflor (671W88OY8K) ; Insecticides
    Language English
    Publishing date 2023-02-18
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 1056014-2
    ISSN 1572-9729 ; 0923-9820
    ISSN (online) 1572-9729
    ISSN 0923-9820
    DOI 10.1007/s10532-023-10020-x
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  2. Article ; Online: Asp-tRNA

    Yu, Xue-Xiu / Chen, Ke-Xin / Yuan, Pan-Pan / Wang, Yu-He / Li, Hua-Xiao / Zhao, Yun-Xiu / Dai, Yi-Jun

    The Science of the total environment

    2024  Volume 928, Page(s) 172479

    Abstract: The main metabolic product of the pyridinecarboxamide insecticide flonicamid, N-(4-trifluoromethylnicotinyl)glycinamide (TFNG-AM), has been shown to have very high mobility in soil, leading to its accumulation in the environment. Catabolic pathways of ... ...

    Abstract The main metabolic product of the pyridinecarboxamide insecticide flonicamid, N-(4-trifluoromethylnicotinyl)glycinamide (TFNG-AM), has been shown to have very high mobility in soil, leading to its accumulation in the environment. Catabolic pathways of flonicamid have been widely reported, but few studies have focused on the metabolism of TFNG-AM. Here, the rapid transformation of TFNG-AM and production of the corresponding acid product N-(4-trifluoromethylnicotinoyl) glycine (TFNG) by the plant growth-promoting bacterium Variovorax boronicumulans CGMCC 4969 were investigated. With TFNG-AM at an initial concentration of 0.86 mmol/L, 90.70 % was transformed by V. boronicumulans CGMCC 4969 resting cells within 20 d, with a degradation half-life of 4.82 d. A novel amidase that potentially mediated this transformation process, called AmiD, was identified by bioinformatic analyses. The gene encoding amiD was cloned and expressed recombinantly in Escherichia coli, and the enzyme AmiD was characterized. Key amino acid residue Val154, which is associated with the catalytic activity and substrate specificity of signature family amidases, was identified for the first time by homology modeling, structural alignment, and site-directed mutagenesis analyses. When compared to wild-type recombinant AmiD, the mutant AmiD V154G demonstrated a 3.08-fold increase in activity toward TFNG-AM. The activity of AmiD V154G was greatly increased toward aromatic L-phenylalanine amides, heterocyclic TFNG-AM and IAM, and aliphatic asparagine, whereas it was dramatically lowered toward benzamide, phenylacetamide, nicotinamide, acetamide, acrylamide, and hexanamid. Quantitative PCR analysis revealed that AmiD may be a substrate-inducible enzyme in V. boronicumulans CGMCC 4969. The mechanism of transcriptional regulation of AmiD by a member of the AraC family of regulators encoded upstream of the amiD gene was preliminarily investigated. This study deepens our understanding of the mechanisms of metabolism of toxic amides in the environment, providing new ideas for microbial bioremediation.
    MeSH term(s) Insecticides/metabolism ; Comamonadaceae/metabolism ; Comamonadaceae/genetics ; Amidohydrolases/metabolism ; Amidohydrolases/genetics ; Biodegradation, Environmental ; Nicotinic Acids/metabolism ; Niacinamide/analogs & derivatives
    Chemical Substances Insecticides ; Amidohydrolases (EC 3.5.-) ; flonicamid (9500W2Z53J) ; amidase (EC 3.5.1.4) ; Nicotinic Acids ; Niacinamide (25X51I8RD4)
    Language English
    Publishing date 2024-04-14
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 121506-1
    ISSN 1879-1026 ; 0048-9697
    ISSN (online) 1879-1026
    ISSN 0048-9697
    DOI 10.1016/j.scitotenv.2024.172479
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  3. Article ; Online: Biodegradation of the pyridinecarboxamide insecticide flonicamid by Microvirga flocculans and characterization of two novel amidases involved.

    Zhao, Yun-Xiu / Guo, Ling / Wang, Li / Jiang, Neng-Dang / Chen, Ke-Xin / Dai, Yi-Jun

    Ecotoxicology and environmental safety

    2021  Volume 220, Page(s) 112384

    Abstract: Flonicamid (N-cyanomethyl-4-trifluoromethylnicotinamide, FLO) is a new type of pyridinecarboxamide insecticide that exhibits particularly good efficacy in pest control. However, the extensive use of FLO in agricultural production poses environmental ... ...

    Abstract Flonicamid (N-cyanomethyl-4-trifluoromethylnicotinamide, FLO) is a new type of pyridinecarboxamide insecticide that exhibits particularly good efficacy in pest control. However, the extensive use of FLO in agricultural production poses environmental risks. Hence, its environmental behavior and degradation mechanism have received increasing attention. Microvirga flocculans CGMCC 1.16731 rapidly degrades FLO to produce the intermediate N-(4-trifluoromethylnicotinoyl) glycinamide (TFNG-AM) and the end acid metabolite 4-(trifluoromethyl) nicotinol glycine (TFNG). This bioconversion is mediated by the nitrile hydratase/amidase system; however, the amidase that is responsible for the conversion of TFNG-AM to TFNG has not yet been reported. Here, gene cloning, overexpression in Escherichia coli and characterization of pure enzymes showed that two amidases-AmiA and AmiB-hydrolyzed TFNG-AM to TFNG. AmiA and AmiB showed only 20-30% identity to experimentally characterized amidase signature family members, and represent novel amidases. Compared with AmiA, AmiB was more sensitive to silver and copper ions but more resistant to organic solvents. Both enzymes demonstrated good pH tolerance and exhibited broad amide substrate specificity. Homology modeling suggested that residues Asp191 and Ser195 may strongly affect the catalytic activity of AmiA and AmiB, respectively. The present study furthers our understanding of the enzymatic mechanisms of biodegradation of nitrile-containing insecticides and may aid in the development of a bioremediation agent for FLO.
    MeSH term(s) Amidohydrolases/metabolism ; Bacterial Proteins/genetics ; Bacterial Proteins/metabolism ; Biodegradation, Environmental ; Gene Expression Regulation, Bacterial/physiology ; Gene Expression Regulation, Enzymologic ; Insecticides/chemistry ; Insecticides/metabolism ; Methylobacteriaceae/metabolism ; Niacinamide/analogs & derivatives ; Niacinamide/metabolism
    Chemical Substances Bacterial Proteins ; Insecticides ; Niacinamide (25X51I8RD4) ; flonicamid (9500W2Z53J) ; Amidohydrolases (EC 3.5.-)
    Language English
    Publishing date 2021-06-03
    Publishing country Netherlands
    Document type Journal Article
    ZDB-ID 436536-7
    ISSN 1090-2414 ; 0147-6513
    ISSN (online) 1090-2414
    ISSN 0147-6513
    DOI 10.1016/j.ecoenv.2021.112384
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  4. Article: Nitroreduction of imidacloprid by the actinomycete Gordonia alkanivorans and the stability and acute toxicity of the nitroso metabolite

    Cheng, Xi / Chen, Ke-xin / Jiang, Neng-dang / Wang, Li / Jiang, Huo-yong / Zhao, Yun-xiu / Dai, Zhi-ling / Dai, Yi-jun

    Chemosphere. 2022 Mar., v. 291

    2022  

    Abstract: The insecticide imidacloprid (IMI), which is used worldwide, pollutes environments and has significant ecotoxicological effects. Microbial metabolism and photolysis are the major pathways of IMI degradation in natural environments. Several studies have ... ...

    Abstract The insecticide imidacloprid (IMI), which is used worldwide, pollutes environments and has significant ecotoxicological effects. Microbial metabolism and photolysis are the major pathways of IMI degradation in natural environments. Several studies have reported that the metabolites of IMI nitroreduction are more toxic to some insects and mammals than IMI itself. Thus, environmental degradation of IMI may enhance the ecotoxicity of IMI and have adverse effects on non-target organisms. Here, we report that an actinomycete—Gordonia alkanivorans CGMCC 21704—transforms IMI to a nitroreduction metabolite, nitroso IMI. Resting cells of G. alkanivorans at OD₆₀₀ ₙₘ = 10 transformed 95.7% of 200 mg L⁻¹ IMI to nitroso IMI in 4 d. Nitroso IMI was stable at pH 4–9. However, it rapidly degraded under sunlight via multiple oxidation, dehalogenation, and oxidative cleavage reactions to form 10 derivatives; the half-life of nitroso IMI in photolysis was 0.41 h, compared with 6.19 h for IMI. Acute toxicity studies showed that the half maximal effective concentration (EC₅₀) values of IMI, nitroso IMI, and its photolytic metabolites toward the planktonic crustacean Daphnia magna for immobilization (exposed to the test compounds for 48 h) were 17.70, 9.38, 8.44 mg L⁻¹, respectively. The half-life of nitroso IMI in various soils was also examined. The present study reveals that microbial nitroreduction accelerates IMI degradation and the nitroso IMI is easily decomposed by sunlight and in soil. However, nitroso IMI and its photolytic products have higher toxicity toward D. magna than the parent compound IMI, and therefore increase the ecotoxicity of IMI.
    Keywords Daphnia magna ; acute toxicity ; dehalogenation ; ecotoxicology ; environmental degradation ; half life ; imidacloprid ; median effective concentration ; metabolism ; metabolites ; oxidation ; pH ; photolysis ; plankton ; soil ; solar radiation
    Language English
    Dates of publication 2022-03
    Publishing place Elsevier Ltd
    Document type Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2021.132885
    Database NAL-Catalogue (AGRICOLA)

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  5. Article ; Online: A "Pre-Division Metal Clusters" Strategy to Mediate Efficient Dual-Active Sites ORR Catalyst for Ultralong Rechargeable Zn-Air Battery.

    Zhao, Yun-Xiu / Wen, Jing-Hong / Li, Ping / Zhang, Peng-Fang / Wang, Su-Na / Li, Da-Cheng / Dou, Jian-Min / Li, Yun-Wu / Ma, Hui-Yan / Xu, Liqiang

    Angewandte Chemie (International ed. in English)

    2023  Volume 62, Issue 11, Page(s) e202216950

    Abstract: To conquer the bottleneck of sluggish kinetics in cathodic oxygen reduction reaction (ORR) of metal-air batteries, catalysts with dual-active centers have stood out. Here, a "pre-division metal clusters" strategy is firstly conceived to fabricate a N,S- ... ...

    Abstract To conquer the bottleneck of sluggish kinetics in cathodic oxygen reduction reaction (ORR) of metal-air batteries, catalysts with dual-active centers have stood out. Here, a "pre-division metal clusters" strategy is firstly conceived to fabricate a N,S-dual doped honeycomb-like carbon matrix inlaid with CoN
    Language English
    Publishing date 2023-01-25
    Publishing country Germany
    Document type Journal Article
    ZDB-ID 2011836-3
    ISSN 1521-3773 ; 1433-7851
    ISSN (online) 1521-3773
    ISSN 1433-7851
    DOI 10.1002/anie.202216950
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  6. Article ; Online: Bioinformatics of a Novel Nitrile Hydratase Gene Cluster of the N

    Zhao, Yun-Xiu / Yang, Wen-Long / Guo, Ling / Jiang, Huo-Yong / Cheng, Xi / Dai, Yi-Jun

    Journal of agricultural and food chemistry

    2020  Volume 68, Issue 35, Page(s) 9299–9307

    Abstract: Microvirga ... ...

    Abstract Microvirga flocculans
    MeSH term(s) Amino Acid Sequence ; Bacterial Proteins/chemistry ; Bacterial Proteins/genetics ; Bacterial Proteins/metabolism ; Computational Biology ; Hydro-Lyases/chemistry ; Hydro-Lyases/genetics ; Hydro-Lyases/metabolism ; Kinetics ; Methylobacteriaceae/chemistry ; Methylobacteriaceae/enzymology ; Methylobacteriaceae/genetics ; Methylobacteriaceae/physiology ; Multigene Family ; Nitriles/chemistry ; Nitriles/metabolism ; Nitrogen Fixation ; Phylogeny ; Sequence Alignment
    Chemical Substances Bacterial Proteins ; Nitriles ; Hydro-Lyases (EC 4.2.1.-) ; nitrile hydratase (EC 4.2.1.-)
    Language English
    Publishing date 2020-08-20
    Publishing country United States
    Document type Journal Article
    ZDB-ID 241619-0
    ISSN 1520-5118 ; 0021-8561
    ISSN (online) 1520-5118
    ISSN 0021-8561
    DOI 10.1021/acs.jafc.0c03702
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  7. Article: Bioinformatics of a Novel Nitrile Hydratase Gene Cluster of the N₂-Fixing Bacterium Microvirga flocculans CGMCC 1.16731 and Characterization of the Enzyme

    Zhao, Yun-Xiu / Yang, Wen-Long / Guo, Ling / Jiang, Huo-Yong / Cheng, Xi / Dai, Yi-Jun

    Journal of agricultural and food chemistry. 2020 Aug. 10, v. 68, no. 35

    2020  

    Abstract: Microvirga flocculans CGMCC 1.16731 can degrade many cyano group-containing neonicotinoid insecticides. Here, its genome was sequenced, and a novel nitrile hydratase gene cluster was discovered in a plasmid. The NHase gene cluster (pnhF) has gene ... ...

    Abstract Microvirga flocculans CGMCC 1.16731 can degrade many cyano group-containing neonicotinoid insecticides. Here, its genome was sequenced, and a novel nitrile hydratase gene cluster was discovered in a plasmid. The NHase gene cluster (pnhF) has gene structure β-subunit 1, α-subunit, and β-subunit 2, which is different from previously reported NHase gene structures. Phylogenetic analysis of α-subunits indicated that NHases containing the three subunit (β1αβ2) structure are independent from NHases containing two subunits (αβ). pnhF was successfully expressed in Escherichia coli, and the purified PnhF could convert the nitrile-containing insecticide flonicamid to N-(4-trifluoromethylnicotinoyl)glycinamide. The enzymatic properties of PnhF were investigated using flonicamid as a substrate. Homology models revealed that amino acid residue β1-Glu56 may strongly affect the catalytic activity of PnhF. This study expands our understanding of the structures and functions of NHases and the enzymatic mechanism of the environmental fate of flonicamid.
    Keywords Escherichia coli ; amino acids ; bacteria ; bioinformatics ; catalytic activity ; environmental fate ; flonicamid ; food chemistry ; multigene family ; nitrile hydratase ; phylogeny ; plasmids
    Language English
    Dates of publication 2020-0810
    Size p. 9299-9307.
    Publishing place American Chemical Society
    Document type Article
    Note NAL-AP-2-clean
    ZDB-ID 241619-0
    ISSN 1520-5118 ; 0021-8561
    ISSN (online) 1520-5118
    ISSN 0021-8561
    DOI 10.1021/acs.jafc.0c03702
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  8. Article ; Online: Biodegradation of flonicamid by Ensifer adhaerens CGMCC 6315 and enzymatic characterization of the nitrile hydratases involved.

    Zhao, Yun-Xiu / Wang, Li / Chen, Ke-Xin / Jiang, Neng-Dang / Sun, Shi-Lei / Ge, Feng / Dai, Yi-Jun

    Microbial cell factories

    2021  Volume 20, Issue 1, Page(s) 133

    Abstract: Background: Flonicamid (N-cyanomethyl-4-trifluoromethylnicotinamide, FLO) is a new type of pyridinamide insecticide that regulates insect growth. Because of its wide application in agricultural production and high solubility in water, it poses potential ...

    Abstract Background: Flonicamid (N-cyanomethyl-4-trifluoromethylnicotinamide, FLO) is a new type of pyridinamide insecticide that regulates insect growth. Because of its wide application in agricultural production and high solubility in water, it poses potential risks to aquatic environments and food chain.
    Results: In the present study, Ensifer adhaerens CGMCC 6315 was shown to efficiently transform FLO into N-(4-trifluoromethylnicotinoyl) glycinamide (TFNG-AM) via a hydration pathway mediated by two nitrile hydratases, PnhA and CnhA. In pure culture, resting cells of E. adhaerens CGMCC 6315 degraded 92% of 0.87 mmol/L FLO within 24 h at 30 °C (half-life 7.4 h). Both free and immobilized (by gel beads, using calcium alginate as a carrier) E. adhaerens CGMCC 6315 cells effectively degraded FLO in surface water. PnhA has, to our knowledge, the highest reported degradation activity toward FLO, V
    Conclusions: Application of E. adhaerens may be a good strategy for bioremediation of FLO in surface water. This work furthers our understanding of the enzymatic mechanisms of biodegradation of nitrile-containing insecticides and provides effective transformation strategies for microbial remediation of FLO contamination.
    MeSH term(s) Bacterial Proteins/metabolism ; Biodegradation, Environmental ; Hydro-Lyases/metabolism ; Insecticides/metabolism ; Niacinamide/analogs & derivatives ; Niacinamide/metabolism ; Nitriles/metabolism ; Rhizobiaceae/enzymology ; Rhizobiaceae/metabolism
    Chemical Substances Bacterial Proteins ; Insecticides ; Nitriles ; Niacinamide (25X51I8RD4) ; flonicamid (9500W2Z53J) ; Hydro-Lyases (EC 4.2.1.-) ; nitrile hydratase (EC 4.2.1.-)
    Language English
    Publishing date 2021-07-13
    Publishing country England
    Document type Journal Article
    ISSN 1475-2859
    ISSN (online) 1475-2859
    DOI 10.1186/s12934-021-01620-4
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Nitroreduction of imidacloprid by the actinomycete Gordonia alkanivorans and the stability and acute toxicity of the nitroso metabolite.

    Cheng, Xi / Chen, Ke-Xin / Jiang, Neng-Dang / Wang, Li / Jiang, Huo-Yong / Zhao, Yun-Xiu / Dai, Zhi-Ling / Dai, Yi-Jun

    Chemosphere

    2021  Volume 291, Issue Pt 2, Page(s) 132885

    Abstract: The insecticide imidacloprid (IMI), which is used worldwide, pollutes environments and has significant ecotoxicological effects. Microbial metabolism and photolysis are the major pathways of IMI degradation in natural environments. Several studies have ... ...

    Abstract The insecticide imidacloprid (IMI), which is used worldwide, pollutes environments and has significant ecotoxicological effects. Microbial metabolism and photolysis are the major pathways of IMI degradation in natural environments. Several studies have reported that the metabolites of IMI nitroreduction are more toxic to some insects and mammals than IMI itself. Thus, environmental degradation of IMI may enhance the ecotoxicity of IMI and have adverse effects on non-target organisms. Here, we report that an actinomycete-Gordonia alkanivorans CGMCC 21704-transforms IMI to a nitroreduction metabolite, nitroso IMI. Resting cells of G. alkanivorans at OD
    MeSH term(s) Actinobacteria ; Animals ; Insecticides/toxicity ; Neonicotinoids/toxicity ; Nitro Compounds/toxicity
    Chemical Substances Insecticides ; Neonicotinoids ; Nitro Compounds ; imidacloprid (3BN7M937V8)
    Language English
    Publishing date 2021-11-11
    Publishing country England
    Document type Journal Article
    ZDB-ID 120089-6
    ISSN 1879-1298 ; 0045-6535 ; 0366-7111
    ISSN (online) 1879-1298
    ISSN 0045-6535 ; 0366-7111
    DOI 10.1016/j.chemosphere.2021.132885
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  10. Article ; Online: Bioconversion of indole-3-acetonitrile by the N

    Zhao, Yun-Xiu / Guo, Lei-Lei / Sun, Shi-Lei / Guo, Jing-Jing / Dai, Yi-Jun

    International microbiology : the official journal of the Spanish Society for Microbiology

    2019  Volume 23, Issue 2, Page(s) 225–232

    Abstract: ... An ... ...

    Abstract An N
    MeSH term(s) Bacterial Proteins/biosynthesis ; Bacterial Proteins/metabolism ; Biodegradation, Environmental ; Environmental Pollutants/metabolism ; Escherichia coli/metabolism ; Hydro-Lyases/biosynthesis ; Hydro-Lyases/metabolism ; Indoleacetic Acids/metabolism ; Indoles/metabolism ; Insecticides/metabolism ; Recombinant Proteins/biosynthesis ; Recombinant Proteins/metabolism ; Rhizobiaceae/enzymology
    Chemical Substances Bacterial Proteins ; Environmental Pollutants ; Indoleacetic Acids ; Indoles ; Insecticides ; Recombinant Proteins ; indoleacetamide (879-37-8) ; indole-3-acetonitrile (AG97OFW8JW) ; Hydro-Lyases (EC 4.2.1.-) ; nitrile hydratase (EC 4.2.1.-)
    Language English
    Publishing date 2019-08-13
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 1454951-7
    ISSN 1618-1905 ; 1139-6709
    ISSN (online) 1618-1905
    ISSN 1139-6709
    DOI 10.1007/s10123-019-00094-0
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