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Lu X, Jiang L, Chen L, Ding W, Wu H, Ma Z. Establishment and evaluation of targeted molecular screening model for the ryanodine receptor or sarco/endoplasmic reticulum calcium ATPase. PEST MANAGEMENT SCIENCE 2024; 80:3369-3378. [PMID: 38391097 DOI: 10.1002/ps.8040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2023] [Revised: 02/20/2024] [Accepted: 02/23/2024] [Indexed: 02/24/2024]
Abstract
BACKGROUD Endoplasmic reticulum/sarcoplasmic reticulum (ER/SR) is crucial for maintaining intracellular calcium homeostasis due to the calcium-signaling-related proteins on its membrane. While ryanodine receptors (RyR) on insect ER/SR membranes are well-known as targets for diamide insecticides, little is known about other calcium channels. Given the resistance of diamide insecticides, the establishment of molecular screening models targeting RyR or sarco/endoplasmic reticulum calcium ATPase (SERCA) is conducive to the discovery of new insecticidal molecules. RESULTS The morphological features of Mythimna separata SR have closed vesicles with integrity and high density. The 282 proteins in the SR component contained RyR and SERCA. A measurement model for the release and uptake of calcium was successfully established by detecting calcium ions outside the SR membrane using a fluorescence spectrophotometer. In vitro testing systems using SR vesicles found that diamide insecticides could activate dose-dependently RyR, with EC50 values of 0.14 μM (Chlorantraniliprole), 0.21 μM (Flubendiamide), and 0.57 μM (Cyantraniliprole), respectively. However, dantrolene inhibited RyR-mediated calcium release with an IC50 value of 353.9 μM, suggesting that dantrolene can weakly antagonize RyR. Moreover, cyclopiazonic acid significantly reduced the enzyme activity and calcium uptake capacity of SERCA. On the contrary, CDN1163 markedly activated the enzyme activity and improved the calcium transport capacity of SERCA. CONCLUSIONS SR vesicles can be used to study the function of unknown proteins on the SR membranes, as well as for high-throughput screening of highly active compounds targeting RyR or SERCA. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Xiaopeng Lu
- Key Laboratory of Plant Protection Resources and Pest Management of Ministry of Education, College of Plant Protection, Northwest A & F University, Yangling, China
| | - Linlin Jiang
- Key Laboratory of Plant Protection Resources and Pest Management of Ministry of Education, College of Plant Protection, Northwest A & F University, Yangling, China
| | - Li Chen
- Key Laboratory of Plant Protection Resources and Pest Management of Ministry of Education, College of Plant Protection, Northwest A & F University, Yangling, China
| | - Wenwei Ding
- Key Laboratory of Plant Protection Resources and Pest Management of Ministry of Education, College of Plant Protection, Northwest A & F University, Yangling, China
| | - Hua Wu
- Key Laboratory of Plant Protection Resources and Pest Management of Ministry of Education, College of Plant Protection, Northwest A & F University, Yangling, China
| | - Zhiqing Ma
- Key Laboratory of Plant Protection Resources and Pest Management of Ministry of Education, College of Plant Protection, Northwest A & F University, Yangling, China
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Lavertu JD, Bawa KK, Hrapovic S, Fu D, Oh JK, Hemraz UD. Fabrication of thermo-responsive multicore microcapsules using a facile extrusion process. RSC Adv 2024; 14:20105-20112. [PMID: 38915334 PMCID: PMC11194665 DOI: 10.1039/d4ra03131h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Accepted: 06/16/2024] [Indexed: 06/26/2024] Open
Abstract
A process employing extrusion was used to produce multicore microcapsules composed of multiple beads. The inner beads were made from κ-carrageenan (κ-c), a thermo-responsive linear sulphated polymer whose gelling temperature ranges at 40-60 °C, depending on the concentration of κ-c polymer and the amount of potassium chloride used for gelation. The resulting beads were then enveloped by chitosan through gelation with sodium triphosphate. The pesticide ammonium glufosinate was encapsulated in the κ-c/chitosan multicore microcapsules for demonstration of controlled release of the encapsulant. It was found that in response to an external stimulus, such as elevated temperature or solar simulation, the microcapsules exhibit the gradual release of encapsulated pesticide molecules from multicore microcapsules, compared with beads only. This process of making multicore microcapsules can be extended to other polymer pairs based on applications. This work is relevant to agriculture, where the controlled-release of the pesticides or fertilizers could be triggered by the sun and/or temperature changes, thus extending the residual period of the chemicals as well as decreasing the extent of pollution by leaching of abundant chemicals.
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Affiliation(s)
- Jean-Danick Lavertu
- Aquatic and Crop Resource Development, National Research Council of Canada 6100 Royalmount Avenue Montreal Quebec H4P 2R2 Canada
| | - Kamaljeet Kaur Bawa
- Department of Chemistry and Biochemistry, Concordia University Montreal Quebec H4B 1R6 Canada
| | - Sabahudin Hrapovic
- Aquatic and Crop Resource Development, National Research Council of Canada 6100 Royalmount Avenue Montreal Quebec H4P 2R2 Canada
| | - Dong Fu
- Aquatic and Crop Resource Development, National Research Council of Canada 6100 Royalmount Avenue Montreal Quebec H4P 2R2 Canada
| | - Jung Kwon Oh
- Department of Chemistry and Biochemistry, Concordia University Montreal Quebec H4B 1R6 Canada
| | - Usha D Hemraz
- Aquatic and Crop Resource Development, National Research Council of Canada 6100 Royalmount Avenue Montreal Quebec H4P 2R2 Canada
- Human Health Therapeutics, National Research Council of Canada 6100 Royalmount Avenue Montreal Quebec H4P 2R2 Canada
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Asmus E, Barber DM, Bojack G, Bollenbach-Wahl B, Brown RW, Döller U, Freigang J, Gatzweiler E, Getachew R, Heinemann I, Hohmann S, Ko KY, Laber B, Lange G, Mattison RL, Minn K, Müller T, Petry T, Reingruber AM, Schmutzler D, Svejda A, Frackenpohl J. Discovery and optimization of spirocyclic lactams that inhibit acyl-ACP thioesterase. PEST MANAGEMENT SCIENCE 2024. [PMID: 38334233 DOI: 10.1002/ps.8015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2024] [Accepted: 02/09/2024] [Indexed: 02/10/2024]
Abstract
BACKGROUND There are various methods to control weeds, that represent considerable challenges for farmers around the globe, although applying small molecular compounds is still the most effective and versatile technology to date. In the search for novel chemical entities with new modes-of-action that can control weeds displaying resistance, we have investigated two spirocyclic classes of acyl-ACP thioesterase inhibitors based on X-ray co-crystal structures and subsequent modelling studies. RESULTS By exploiting scaffold-hopping and isostere concepts, we were able to identify new spirolactam-based lead structures showing promising activity in vivo against commercially important grass weeds in line with strong target affinity. CONCLUSION The present work covers a series of novel herbicidal lead structures that contain a spirocyclic lactam as a structural key feature carrying ortho-substituted benzyl or heteroarylmethylene side chains. These new compounds show good acyl-ACP thioesterase inhibition in line with strong herbicidal activity. Glasshouse trials showed that the spirolactams outlined herein display promising control of grass-weed species in pre-emergence application combined with dose-response windows that enable partial selectivity in wheat and corn. Remarkably, some of the novel acyl-ACP thioesterase-inhibitors showed efficacy against resistant grass weeds such as Alopecurus myosuroides and Lolium spp. on competitive levels compared with commercial standards. © 2024 Society of Chemical Industry.
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Affiliation(s)
- Elisabeth Asmus
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - David M Barber
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Guido Bojack
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Birgit Bollenbach-Wahl
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Ronald W Brown
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Uwe Döller
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Jörg Freigang
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Elmar Gatzweiler
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Rahel Getachew
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Ines Heinemann
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Sabine Hohmann
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Kwang-Yoon Ko
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Bernd Laber
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Gudrun Lange
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Rebecca L Mattison
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Klemens Minn
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Thomas Müller
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Thomas Petry
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Anna M Reingruber
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Dirk Schmutzler
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Andrea Svejda
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
| | - Jens Frackenpohl
- Research & Development, Weed Control, Division Crop Science, Bayer AG, Industriepark Höchst, Frankfurt, Germany
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Duke SO, Pan Z, Bajsa-Hirschel J, Tamang P, Hammerschmidt R, Lorsbach BA, Sparks TC. Molecular Targets of Herbicides and Fungicides─Are There Useful Overlaps for Fungicide Discovery? JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:20532-20548. [PMID: 38100716 PMCID: PMC10755756 DOI: 10.1021/acs.jafc.3c07166] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2023] [Revised: 11/20/2023] [Accepted: 11/21/2023] [Indexed: 12/17/2023]
Abstract
New fungicide modes of action are needed for fungicide resistance management strategies. Several commercial herbicide targets found in fungi that are not utilized by commercial fungicides are discussed as possible fungicide molecular targets. These are acetyl CoA carboxylase, acetolactate synthase, 5-enolpyruvylshikimate-3-phosphate synthase, glutamine synthase, phytoene desaturase, protoporphyrinogen oxidase, long-chain fatty acid synthase, dihydropteroate synthase, hydroxyphenyl pyruvate dioxygenase, and Ser/Thr protein phosphatase. Some of the inhibitors of these herbicide targets appear to be either good fungicides or good leads for new fungicides. For example, some acetolactate synthase and dihydropteroate inhibitors are excellent fungicides. There is evidence that some herbicides have indirect benefits to certain crops due to their effects on fungal crop pathogens. Using a pesticide with both herbicide and fungicide activities based on the same molecular target could reduce the total amount of pesticide used. The limitations of such a product are discussed.
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Affiliation(s)
- Stephen O. Duke
- National
Center for Natural Products Research, School of Pharmacy, University of Mississippi, University 38667, United States
| | - Zhiqiang Pan
- Natural
Products Utilization Research Unit, United
States Department of Agriculture, University 38667, United States
| | - Joanna Bajsa-Hirschel
- Natural
Products Utilization Research Unit, United
States Department of Agriculture, University 38667, United States
| | - Prabin Tamang
- Natural
Products Utilization Research Unit, United
States Department of Agriculture, University 38667, United States
| | - Raymond Hammerschmidt
- Department
of Plant, Soil and Microbial Sciences, Michigan
State University, East Lansing, Michigan 48824, United States
| | - Beth A. Lorsbach
- Nufarm, 4020 Aerial Center Parkway, Morrisville, North Carolina 27560, United States
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McComic SE, Duke SO, Burgess ER, Swale DR. Defining the toxicological profile of 4-hydroxyphenylpyruvate dioxygenase-directed herbicides to Aedes aegypti and Amblyomma americanum. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 194:105532. [PMID: 37532340 DOI: 10.1016/j.pestbp.2023.105532] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/30/2023] [Accepted: 07/11/2023] [Indexed: 08/04/2023]
Abstract
Inhibitors targeting the 4-hydroxyphenyl pyruvate dioxygenase (HPPD) enzyme are well established herbicides and HPPD is also a primary enzyme within the tyrosine metabolism pathway in hematophagous arthropods, which is an essential metaboilic pathway post-blood feeding to prevent tyrosine-mediated toxicity. The objective of this study was to characterize the toxicity of triketone, pyrazole, pyrazolone, isoxazole, and triazole herbicides that inhibit HPPD to blood-fed mosquitoes and ticks. Topical exposure of nitisinone to blood-fed Aedes aegypti yielded high toxicity with an LD50 of 3.81 ng/insect (95% CI: 3.09 to 4.67 ng; Hillslope: 0.97, r2: 0.99), yet was non-toxic to non-blood fed (NBF) mosquitoes. The rank order of toxicity was nitisinone > tembotrione > pyrazoxyfen > tebuconazole > mesotrione against blood-fed Ae. Aegypti, but nitisinone was approximately 30-fold more toxic than other chemicals tested. We also assessed the toxicity of HPPD-inhibiting herbicides to the lone star tick, Amblyomma americanum and similarly, nitisinone was toxic to Am. americanum with a lethal time to kill 50% of subjects (LT50) of 23 h at 10 μM. Knockdown of the gene encoding the HPPD enzyme was performed through RNA-interference led to significant mortality after blood feeding in both, Ae. aegypti and Am. americanum. Lastly, a fluorescence assay was developed to determine relative quantities of L-tyrosine in Ae. aegypti and Am. americanum treated with HPPD inhibitors. L-tyrosine levels correlated with toxicity with nitisinone exposure leading to increased tyrosine concentrations post-blood feeding. Taken together, these data support previous work suggesting HPPD-inhibitors represent a novel mode of toxicity to mosquitoes and ticks and may represent base scaffolds for development of novel insecticides specific for hematophagous arthropods.
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Affiliation(s)
- Sarah E McComic
- Department of Entomology and Nematology, University of Florida, Gainesville, FL 32610, USA; Emerging Pathogens Institute, University of Florida, Gainesville, FL 32610, USA
| | - Stephen O Duke
- National Center for Natural Products Research, School of Pharmacy, University of Mississippi, Oxford, MS 38677, USA
| | - Edwin R Burgess
- Department of Entomology and Nematology, University of Florida, Gainesville, FL 32610, USA
| | - Daniel R Swale
- Department of Entomology and Nematology, University of Florida, Gainesville, FL 32610, USA; Emerging Pathogens Institute, University of Florida, Gainesville, FL 32610, USA.
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