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Jin J, Chen W, Xu C, Pooe OJ, Xie Y, Shen C, Meng M, Zhu Q, Zhang X, Liu X, Liu Y. Rational design and application of broad-spectrum antibodies for Bt Cry toxins determination. Anal Biochem 2024; 693:115584. [PMID: 38843975 DOI: 10.1016/j.ab.2024.115584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Revised: 05/25/2024] [Accepted: 06/03/2024] [Indexed: 06/18/2024]
Abstract
Using the amino acid sequences and analysis of selected known structures of Bt Cry toxins, Cry1Ab, Cry1Ac, Cry1Ah, Cry1B, Cry1C and Cry1F we specifically designed immunogens. After antibodies selection, broad-spectrum polyclonal antibodies (pAbs) and monoclonal antibody (namely 1A0-mAb) were obtained from rabbit and mouse, respectively. The produced pAbs displayed broad spectrum activity by recognizing Cry1 toxin, Cry2Aa, Cry2Ab and Cry3Aa with half maximal inhibitory concentration (IC50) values of 0.12-9.86 μg/mL. Similarly, 1A0-mAb showed broad spectrum activity, recognizing all of the above Cry protein (IC50 values of 4.66-20.46 μg/mL) with the exception of Cry2Aa. Using optimizations studies, 1A10-mAb was used as a capture antibody and pAbs as detection antibody. Double antibody sandwich enzyme-linked immunosorbent assays (DAS-ELISAs) were established for Cry1 toxin, Cry2Ab and Cry3Aa with the limit of detection (LOD) values of 2.36-36.37 ng/mL, respectively. The present DAS-ELISAs had good accuracy and precisions for the determination of Cry toxin spiked tap water, corn, rice, soybeans and soil samples. In conclusion, the present study has successfully obtained broad-spectrum pAbs and mAb. Furthermore, the generated pAbs- and mAb-based DAS-ELISAs protocol can potentially be used for the broad-spectrum monitoring of eight common subtypes of Bt Cry toxins residues in food and environmental samples.
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Affiliation(s)
- Jiafeng Jin
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China; School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China; College of Plant Protection, Nanjing Agricultural University, Nanjing, 210023, China
| | - Wei Chen
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Chongxin Xu
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China; School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
| | - Ofentse Jacob Pooe
- School of Life Sciences, University of KwaZulu-Natal, Durban, 4000, South Africa
| | - Yajing Xie
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Cheng Shen
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China; College of Plant Protection, Nanjing Agricultural University, Nanjing, 210023, China
| | - Meng Meng
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China; School of Life Sciences, Jiangsu University, Zhenjiang, 212013, China
| | - Qin Zhu
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Xiao Zhang
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Xianjin Liu
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Yuan Liu
- Jiangsu Key Laboratory for Food Quality and Safety-State Key Laboratory Cultivation Base of Ministry of Science and Technology, Institute of Food Safety and Nutrition, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China; School of Food and Biological Engineering, Jiangsu University, Zhenjiang, 212013, China.
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Deng W, Wang D, Dai P, Hong Y, Xiong J, Duan L, Lu R, Wan J, Du H, Hammock BD, Yang W. Development of a sensitive direct competitive chemiluminescent enzyme immunoassay for gentamicin based on the construction of a specific single-chain variable fragment-alkaline phosphatase fusion protein. Microchem J 2024; 197:109706. [PMID: 38283367 PMCID: PMC10810264 DOI: 10.1016/j.microc.2023.109706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2024]
Abstract
A sensitive chemiluminescent enzyme immunoassay (CLEIA) was established for the determination of gentamicin (GEN) residue levels in animal tissue. This assay is based on a fusion protein of single-chain variable fragment (scFv) and alkaline phosphatase (AP). Initially, VL and VH derived from anti-gentamicin monoclonal antibody were linked by a short peptide to construct a scFv. Subsequently, the constructed scFv sequence was accessed into the pLIP6/GN vector, and a soluble scFv-AP fusion protein was generated. The scFv-AP fusion protein was used to develop a direct competitive CLEIA (dcCLEIA) for the determination of gentamicin. In the dcCLEIA, the half inhibitory concentration (IC50) and limit of detection (LOD) were 1.073 ng/mL and 0.380 ng/mL, respectively. The average recoveries of gentamicin spiked in animal tissue samples ranged from 78% to 96%. These results showed a strong correlation with ultra performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). The above results suggest that the anti-GEN scFv-AP fusion protein is suitable for detecting gentamicin residues in edible animal tissues.
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Affiliation(s)
- Weijie Deng
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Dan Wang
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Peng Dai
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Yanping Hong
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Jianhua Xiong
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Luying Duan
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Ruimin Lu
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Jianchun Wan
- Technology Center of Nanchang Customs District, Nanchang 330038, China
| | - Huaying Du
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
| | - Bruce D. Hammock
- Department of Entomology and Nematology and UCD Comprehensive Cancer Center, University of California, Davis, CA 95616, United States
| | - Wuying Yang
- Key Laboratory of Agricultural Products Processing and Quality Control of Nanchang City/College of Food Science and Engineering, Jiangxi Agricultural University, Nanchang 330045, China
- Department of Entomology and Nematology and UCD Comprehensive Cancer Center, University of California, Davis, CA 95616, United States
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