1
|
Jeon MY, Han JE, Lee DG, Cho YL, Jang JH, Lee J, Park JG, Kwon DH, Park SY, Kim W, Lee K, Kim JH, Lee NK. Novel sandwich immunoassay detects a shrimp AHPND-causing binary PirAB Vp toxin produced by Vibrio parahaemolyticus. Front Cell Infect Microbiol 2023; 13:1294801. [PMID: 38089817 PMCID: PMC10711049 DOI: 10.3389/fcimb.2023.1294801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2023] [Accepted: 11/06/2023] [Indexed: 12/18/2023] Open
Abstract
Introduction The binary PirA/PirB toxin expressed by Vibrio parahaemolyticus (PirABVp) is a virulent complex that causes acute hepatopancreatic necrosis disease (AHPND) in shrimps, affecting the global shrimp farming industry. AHPND is currently diagnosed by detecting pirA and pirB genes by PCR; however, several V. parahaemolyticus strains do not produce the two toxins as proteins. Thus, an immunoassay using antibodies may be the most effective tool for detecting toxin molecules. In this study, we report a sandwich ELISA-based immunoassay for the detection of PirABVp. Methods We utilized a single-chain variable fragment (scFv) antibody library to select scFvs against the PirA or PirB subunits. Phage display panning rounds were conducted to screen and identify scFv antibodies directed against each recombinant toxin subunit. Selected scFvs were converted into IgGs to develop a sandwich immunoassay to detect recombinant and bacterial PirABVp. Results Antibodies produced as IgG forms showed sub-nanomolar to nanomolar affinities (KD), and a pair of anti-PirA antibody as a capture and anti-PirB antibody as a detector showed a limit of detection of 201.7 ng/mL for recombinant PirABVp. The developed immunoassay detected PirABVp in the protein lysates of AHPND-causing V. parahaemolyticus (VpAHPND) and showed a significant detectability in moribund or dead shrimp infected with a VpAHPND virulent strain compared to that in non-infected shrimp. Discussion These results indicate that the developed immunoassay is a reliable method for diagnosing AHPND by detecting PirABVp at the protein level and could be further utilized to accurately determine the virulence of extant or newly identified VpAHPND in the global shrimp culture industry.
Collapse
Affiliation(s)
- Min-Young Jeon
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, Republic of Korea
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon, Republic of Korea
| | - Jee Eun Han
- Laboratory of Aquatic Biomedicine, College of Veterinary Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Dong Gwang Lee
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, Republic of Korea
| | - Young-Lai Cho
- Environmental Diseases Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon, Republic of Korea
| | - Ju-Hong Jang
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, Republic of Korea
| | - Jangwook Lee
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, Republic of Korea
| | - Jong-Gil Park
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, Republic of Korea
| | - Do Hyung Kwon
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, Republic of Korea
| | - Seon Young Park
- Division of Animal and Dairy Sciences, College of Agriculture and Life Science, Chungnam National University, Daejeon, Republic of Korea
| | - Wantae Kim
- Department of Biochemistry, College of Natural Sciences, Chungnam National University, Daejeon, Republic of Korea
| | - Kyunglee Lee
- Cetacean Research Institute, National Institute of Fisheries Science, Ulsan, Republic of Korea
| | - Ji Hyung Kim
- Department of Food Science and Biotechnology, College of BioNano Technology, Gachon University, Seongnam, Republic of Korea
| | - Nam-Kyung Lee
- Biotherapeutics Translational Research Center, Korea Research Institute of Bioscience & Biotechnology (KRIBB), Daejeon, Republic of Korea
| |
Collapse
|