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Kaundun SS, Downes J, Jackson LV, Hutchings SJ, Mcindoe E. Impact of a Novel W2027L Mutation and Non-Target Site Resistance on Acetyl-CoA Carboxylase-Inhibiting Herbicides in a French Lolium multiflorum Population. Genes (Basel) 2021; 12:genes12111838. [PMID: 34828444 PMCID: PMC8620607 DOI: 10.3390/genes12111838] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/18/2021] [Accepted: 11/18/2021] [Indexed: 11/24/2022] Open
Abstract
Herbicides that inhibit acetyl-CoA carboxylase (ACCase) are among the few remaining options for the post-emergence control of Lolium species in small grain cereal crops. Here, we determined the mechanism of resistance to ACCase herbicides in a Lolium multiflorum population (HGR) from France. A combined biological and molecular approach detected a novel W2027L ACCase mutation that affects aryloxyphenoxypropionate (FOP) but not cyclohexanedione (DIM) or phenylpyraxoline (DEN) subclasses of ACCase herbicides. Both the wild-type tryptophan and mutant leucine 2027-ACCase alleles could be positively detected in a single DNA-based-derived polymorphic amplified cleaved sequence (dPACS) assay that contained the targeted PCR product and a cocktail of two discriminating restriction enzymes. Additionally, we identified three well-characterised I1781L, I2041T, and D2078G ACCase target site resistance mutations as well as non-target site resistance in HGR. The non-target site component endowed high levels of resistance to FOP herbicides whilst partially impacting on the efficacy of pinoxaden and cycloxydim. This study adequately assessed the contribution of the W2027L mutation and non-target site mechanism in conferring resistance to ACCase herbicides in HGR. It also highlights the versatility and robustness of the dPACS method to simultaneously identify different resistance-causing alleles at a single ACCase codon.
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Ding F, Li LX, Peng W, Peng YK, Liu BQ. Molecular basis for the resistance of American sloughgrass to aryloxyphenoxypropionic acid pesticides and its environmental relevance: A combined experimental and computational study. CHEMOSPHERE 2019; 235:1030-1040. [PMID: 31561292 DOI: 10.1016/j.chemosphere.2019.07.044] [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: 06/04/2019] [Revised: 07/04/2019] [Accepted: 07/05/2019] [Indexed: 06/10/2023]
Abstract
Organic pesticides are one of the main environmental pollutants, and how to reduce their environmental risks is an important issue. In this contribution, we disclose the molecular basis for the resistance of American sloughgrass to aryloxyphenoxypropionic acid pesticides using site-directed mutagenesis and molecular modeling and then construct an effective screening model. The results indicated that the target-site mutation (Trp-1999-Leu) in acetyl-coenzyme A carboxylase (ACCase) can affect the effectiveness of the pesticides (clodinafop, fenoxaprop, cyhalofop, and metamifop), and the plant resistance to fenoxaprop, clodinafop, cyhalofop, and metamifop was found to be 564, 19.5, 10, and 0.19 times, respectively. The established computational models (i.e. wild-type/mutant ACCase models) could be used for rational screening and evaluation of the resistance to pesticides. The resistance induced by target gene mutation can markedly reduce the bioreactivity of the ACCase-clodinafop/fenoxaprop adducts, and the magnitudes are 10 and 102, respectively. Such event will seriously aggravate environmental pollution. However, the biological issue has no distinct effect on cyhalofop (RI=10), and meanwhile it may markedly increase the bioefficacy of metamifop (RI=0.19). We could selectively adopt the two chemicals so as to decrease the residual pesticides in the environment. Significantly, research findings from the computational screening models were found to be negatively correlated with the resistance level derived from the bioassay testing, suggesting that the screening models can be used to guide the usage of pesticides. Obviously, this story may shed novel insight on the reduction of environmental risks of pesticides and other organic pollutants.
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Affiliation(s)
- Fei Ding
- School of Environmental Science and Engineering, Chang'an University, Xi'an, 710064, China; Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Region of Ministry of Education, Chang'an University, No. 126 Yanta Road, Yanta District, Xi'an, 710064, China
| | - Ling-Xu Li
- Department of Agricultural Chemistry, Qingdao Agricultural University, Qingdao, 266109, China
| | - Wei Peng
- College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, 361005, China; Department of Chemistry, China Agricultural University, Beijing, 100193, China.
| | - Yu-Kui Peng
- Center for Food Quality Supervision, Inspection & Testing, Ministry of Agriculture, Northwest A&F University, Yangling, 712100, China
| | - Bing-Qi Liu
- Department of Agricultural Chemistry, Qingdao Agricultural University, Qingdao, 266109, China
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Wawrzyniak AJ, Dilsizian V, Krantz DS, Harris KM, Smith MF, Shankovich A, Whittaker KS, Rodriguez GA, Gottdiener J, Li S, Kop W, Gottlieb SS. High Concordance Between Mental Stress-Induced and Adenosine-Induced Myocardial Ischemia Assessed Using SPECT in Heart Failure Patients: Hemodynamic and Biomarker Correlates. J Nucl Med 2015. [PMID: 26205303 DOI: 10.2967/jnumed.115.157990] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
UNLABELLED Mental stress can trigger myocardial ischemia, but the prevalence of mental stress-induced ischemia in congestive heart failure (CHF) patients is unknown. We characterized mental stress-induced and adenosine-induced changes in myocardial perfusion and neurohormonal activation in CHF patients with reduced left-ventricular function using SPECT to precisely quantify segment-level myocardial perfusion. METHODS Thirty-four coronary artery disease patients (mean age±SD, 62±10 y) with CHF longer than 3 mo and ejection fraction less than 40% underwent both adenosine and mental stress myocardial perfusion SPECT on consecutive days. Mental stress consisted of anger recall (anger-provoking speech) followed by subtraction of serial sevens. The presence and extent of myocardial ischemia was quantified using the conventional 17-segment model. RESULTS Sixty-eight percent of patients had 1 ischemic segment or more during mental stress and 81% during adenosine. On segment-by-segment analysis, perfusion with mental stress and adenosine were highly correlated. No significant differences were found between any 2 time points for B-type natriuretic peptide, tumor necrosis factor-α, IL-1b, troponin, vascular endothelin growth factor, IL-17a, matrix metallopeptidase-9, or C-reactive protein. However, endothelin-1 and IL-6 increased, and IL-10 decreased, between the stressor and 30 min after stress. Left-ventricular end diastolic dimension was 179±65 mL at rest and increased to 217±71 after mental stress and 229±86 after adenosine (P<0.01 for both). Resting end systolic volume was 129±60 mL at rest and increased to 158±66 after mental stress (P<0.05) and 171±87 after adenosine (P<0.07), with no significant differences between adenosine and mental stress. Ejection fraction was 30±12 at baseline, 29±11 with mental stress, and 28±10 with adenosine (P=not significant). CONCLUSION There was high concordance between ischemic perfusion defects induced by adenosine and mental stress, suggesting that mental stress is equivalent to pharmacologic stress in eliciting clinically significant myocardial perfusion defects in CHF patients. Cardiac dilatation suggests clinically important changes with both conditions. Psychosocial stressors during daily life may contribute to the ischemic burden of CHF patients with coronary artery disease.
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Affiliation(s)
| | - Vasken Dilsizian
- Department of Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - David S Krantz
- Uniformed Services University of the Health Sciences, Bethesda, Maryland
| | - Kristie M Harris
- Uniformed Services University of the Health Sciences, Bethesda, Maryland; Department of Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Mark F Smith
- Department of Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Anthony Shankovich
- Department of Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland
| | - Kerry S Whittaker
- Uniformed Services University of the Health Sciences, Bethesda, Maryland
| | | | - John Gottdiener
- Division of Cardiology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
| | - Shuying Li
- Division of Cardiology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
| | - Willem Kop
- Tilburg University, Tilburg, The Netherlands
| | - Stephen S Gottlieb
- Division of Cardiology, Department of Medicine, University of Maryland School of Medicine, Baltimore, Maryland; and
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Zhu X, Zhang M, Liu J, Ge J, Yang G. Ametoctradin is a potent Qo site inhibitor of the mitochondrial respiration complex III. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:3377-3386. [PMID: 25784492 DOI: 10.1021/acs.jafc.5b00228] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Ametoctradin is a new Oomycete-specific fungicide under development by BASF. It is a potent inhibitor of the bc1 complex in mitochondrial respiration. However, its detailed action mechanism remains unknown. In the present work, the binding mode of ametoctradin was first uncovered by integrating molecular docking, MD simulations, and MM/PBSA calculations, which showed that ametoctradin should be a Q(o) site inhibitor of bc1 complex. Subsequently, a series of new 1,2,4-triazolo[1,5-a]pyrimidine derivatives were designed and synthesized to further understand the substituent effects on the 5- and 6-position of 1,2,4-triazolo[1,5-a]pyrimidine. The calculated binding free energies (ΔG(cal)) of newly synthesized analogues as Qo site inhibitors correlated very well (R(2) = 0.96) with their experimental binding free energies (ΔG(exp)). Two compounds (4a and 4c) with higher inhibitory activity against porcine SQR than ametoctradin were successfully identified. The structural and mechanistic insights obtained from the present study will provide a valuable clue for future designing of a new promising bc1 inhibitor.
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Affiliation(s)
- Xiaolei Zhu
- †Key Laboratory of Pesticide and Chemical Biology, College of Chemistry, Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
| | - Mengmeng Zhang
- †Key Laboratory of Pesticide and Chemical Biology, College of Chemistry, Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
| | - Jingjing Liu
- †Key Laboratory of Pesticide and Chemical Biology, College of Chemistry, Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
| | - Jingming Ge
- †Key Laboratory of Pesticide and Chemical Biology, College of Chemistry, Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
| | - Guangfu Yang
- †Key Laboratory of Pesticide and Chemical Biology, College of Chemistry, Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
- ‡Collaborative Innovation Center of Chemical Science and Engineering, Tianjing 30071, P.R.China
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Xu H, Li J, Zhang D, Cheng Y, Jiang Y, Dong L. Mutations at codon position 1999 of acetyl-CoA carboxylase confer resistance to ACCase-inhibiting herbicides in Japanese foxtail (Alopecurus japonicus). PEST MANAGEMENT SCIENCE 2014; 70:1894-1901. [PMID: 24497328 DOI: 10.1002/ps.3753] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Revised: 01/27/2014] [Accepted: 01/27/2014] [Indexed: 06/03/2023]
Abstract
BACKGROUND The intensive and global application of ACCase-inhibiting herbicides has resulted in the evolution of resistance in a growing number of grass weeds. Among the mutations implicated in conferring resistance, limited knowledge is available regarding mutations at codon position 1999. In addition, multiple copies of genes encoding plastidic ACCase have been ignored in previous studies of resistance in Alopecurus japonicus. RESULTS Dose-response tests indicated that the population JLGY-4 had evolved high-level resistance to fenoxaprop-P-ethyl. The carboxyltransferase domain of the ACCase gene in A. japonicus was sequenced and compared. Two loci encoding plastidic ACCase were isolated from both the resistant and sensitive populations. Simultaneously, two resistance-endowing mutations at codon position 1999 of ACCase were determined (W1999C and W1999L). Moreover, a molecular study was conducted to determine the mechanism of resistance to some ACCase-inhibiting herbicides. The W1999C mutation conferred resistance to fenoxaprop and moderate resistance to pinoxaden. The W1999L mutation conferred resistance to fenoxaprop. CONCLUSION This study revealed that A. japonicus had multiple copies of genes encoding plastidic ACCase, and each gene was able to carry its own mutation. It also established the clear importance of the W1999C and W1999L mutations in conferring resistance to ACCase-inhibiting herbicides.
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Affiliation(s)
- Hongle Xu
- College of Plant Protection, Nanjing Agricultural University, Nanjing, China; Key Laboratory of Integrated Pest Management on Crops in East China (Nanjing Agricultural University), Ministry of Agriculture, China
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Kaundun SS. Resistance to acetyl-CoA carboxylase-inhibiting herbicides. PEST MANAGEMENT SCIENCE 2014; 70:1405-17. [PMID: 24700409 DOI: 10.1002/ps.3790] [Citation(s) in RCA: 102] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Revised: 03/21/2014] [Accepted: 04/03/2014] [Indexed: 05/12/2023]
Abstract
Resistance to acetyl-CoA carboxylase herbicides is documented in at least 43 grass weeds and is particularly problematic in Lolium, Alopecurus and Avena species. Genetic studies have shown that resistance generally evolves independently and can be conferred by target-site mutations at ACCase codon positions 1781, 1999, 2027, 2041, 2078, 2088 and 2096. The level of resistance depends on the herbicides, recommended field rates, weed species, plant growth stages, specific amino acid changes and the number of gene copies and mutant ACCase alleles. Non-target-site resistance, or in essence metabolic resistance, is prevalent, multigenic and favoured under low-dose selection. Metabolic resistance can be specific but also broad, affecting other modes of action. Some target-site and metabolic-resistant biotypes are characterised by a fitness penalty. However, the significance for resistance regression in the absence of ACCase herbicides is yet to be determined over a practical timeframe. More recently, a fitness benefit has been reported in some populations containing the I1781L mutation in terms of vegetative and reproductive outputs and delayed germination. Several DNA-based methods have been developed to detect known ACCase resistance mutations, unlike metabolic resistance, as the genes remain elusive to date. Therefore, confirmation of resistance is still carried out via whole-plant herbicide bioassays. A growing number of monocotyledonous crops have been engineered to resist ACCase herbicides, thus increasing the options for grass weed control. While the science of ACCase herbicide resistance has progressed significantly over the past 10 years, several avenues provided in the present review remain to be explored for a better understanding of resistance to this important mode of action.
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Affiliation(s)
- Shiv S Kaundun
- Syngenta, Jealott's Hill International Research Centre, Biological Sciences, Bracknell, Berkshire, UK
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Yang XQ, Liu JY, Li XC, Chen MH, Zhang YL. Key Amino Acid Associated with Acephate Detoxification by Cydia pomonella Carboxylesterase Based on Molecular Dynamics with Alanine Scanning and Site-Directed Mutagenesis. J Chem Inf Model 2014; 54:1356-70. [DOI: 10.1021/ci500159q] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
| | | | - Xian Chun Li
- Department
of Entomology, The University of Arizona, Tucson, Arizona 85721, United States
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Insights into molecular assembly of ACCase heteromeric complex in Chlorella variabilis--a homology modelling, docking and molecular dynamic simulation study. Appl Biochem Biotechnol 2013; 170:1437-57. [PMID: 23677812 DOI: 10.1007/s12010-013-0277-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2013] [Accepted: 04/29/2013] [Indexed: 10/26/2022]
Abstract
Acetyl-CoA carboxylase (ACCase), a biotin-dependent enzyme that catalyses the first committed step of fatty acid biosynthesis, is considered as a potential target for improving lipid accumulation in oleaginous feedstocks, including microalgae. ACCase is composed of three distinct conserved domains, and understanding the structural details of each catalytic domain assumes great significance to gain insights into the molecular basis of the complex formation and mechanism of biotin transport. In the absence of a crystal structure for any single heteromeric ACCase till date, here we report the first heteromeric association model of ACCase from an oleaginous green microalga, Chlorella variabilis, using a combination of homology modelling, docking and molecular dynamic simulations. The binding site of the docked biotin carboxylase (BC) and carboxyltransferase (CT) were predicted to be contiguous but distinct in biotin carboxyl carrier protein (BCCP) molecule. Simulation studies revealed considerable flexibility for the BC and CT domains in the BCCP-bound forms, thus indicating the adaptive behaviour of BCCP. Further, principal component analysis revealed that in the presence of BCCP, the BC and CT domains exhibited an open-state conformation via the outward clockwise rotation of the binding helices. These conformational changes might be responsible for binding of BCCP domain and its translocation to the respective active sites. Various rearrangements of inter-domain hydrogen bonds (H-bonds) contributed to conformational changes in the structures. H-bond interactions between the interacting residue pairs involving Glu201BCCP/Arg255BC and Asp224BCCP/Gln228CT were found to be essential for the intermolecular assembly. The present findings are consistent with previous biochemical studies.
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Zhu XL, Yu NX, Hao GF, Yang WC, Yang GF. Structural basis of femtomolar inhibitors for acetylcholinesterase subtype selectivity: insights from computational simulations. J Mol Graph Model 2013; 41:55-60. [PMID: 23500627 DOI: 10.1016/j.jmgm.2013.01.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2012] [Revised: 01/09/2013] [Accepted: 01/17/2013] [Indexed: 11/17/2022]
Abstract
Acetylcholinesterase (AChE) is a key enzyme of the cholinergic nervous system. More than one gene encodes the synaptic AChE target. As the most potent known AChE inhibitor, the syn1-TZ2PA6 isomer was recently shown to have higher affinity as a reversible organic inhibitor of acetylcholinesterase1 (AChE1) than the anti1-TZ2PA6 isomer. Opposite selectivity has been shown for acetylcholinesterase2 (AChE2). In an attempt to understand the selectivity of the syn1-TZ2PA6 and anti1-TZ2PA6 isomers for AChE1 and AChE2, six molecular dynamics (MD) simulations were carried out with mouse AChE (mAChE, type of AChE1), Torpedo californica AChE (TcAChE, type of AChE1), and Drosophila melanogaster AChE (DmAChE, type of AChE2) bound with syn1-TZ2PA6 and anti1-TZ2PA6 isomers. Within the structure of the inhibitor, the 3,8-diamino-6-phenylphenanthridinium subunit and 9-amino-1,2,3,4-tetrahydroacridine subunit, via π-π interactions, made more favorable contributions to syn1-TZ2PA6 or anti1-TZ2PA6 isomer binding in the mAChE/TcAChE enzyme than the 1,2,3-triazole subunit. Compared to AChE1, the triazole subunit had increased binding energy with AChE2 due to a greater negative charge in the active site. The binding free energy calculated using the MM/PBSA method suggests that selectivity between AChE1 and AChE2 is mainly attributed to decreased binding affinity for the inhibitor.
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Affiliation(s)
- Xiao-Lei Zhu
- Key Laboratory of Pesticide & Chemical Biology, College of Chemistry, Ministry of Education, Central China Normal University, Wuhan 430079, PR China
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Zhu Y, Liu P, Wang D, Zhang J, Cheng J, Ma Y, Zou X, Yang H. Synthesis and Bioactivities of NovelN-(4-(2-Aryloxythiazol-5-yl)but-3-yn-2-yl)benzamides. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201200824] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Zhu X, Wang F, Li H, Yang W, Chen Q, Yang G. Design, Synthesis, and Bioevaluation of Novel Strobilurin Derivatives. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201200607] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Tao J, Zhang G, Zhang A, Zheng L, Cao S. Study on the enantioselectivity inhibition mechanism of acetyl-coenzyme A carboxylase toward haloxyfop by homology modeling and MM-PBSA analysis. J Mol Model 2012; 18:3783-92. [DOI: 10.1007/s00894-012-1387-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2011] [Accepted: 02/16/2012] [Indexed: 11/30/2022]
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