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Wang Q, Ju D, Gao J, Tong P, Chen H. Epitope Mapping of Lysozyme Using the Chinese Egg-Allergic Sera at Both Pooled and Individual Levels. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2023; 71:6458-6467. [PMID: 37053565 DOI: 10.1021/acs.jafc.3c00386] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
To accurately map the B-cell linear epitopes of lysozyme (LYS) in eggs, five bioinformatics tools were first used to obtain the mimotopes. Afterward, based on the Chinese egg-allergic sera samples screened by the indirect enzyme-linked immunosorbent, the epitopes possessing the capability of binding to IgG/IgE were mapped at both pooled and individual levels by using overlapping peptides covering the complete amino acid sequence of LYS. Six B-cell linear epitopes and two dominant B-cell linear epitopes that could bind to LYS-sIgG were mapped for the first time. Seven IgE-binding epitopes and three dominant IgE-binding epitopes were also obtained. Furthermore, AA31-34 and AA88-91 were the shared dominant epitopes of LYS-sIgG and LYS-sIgE at pooled and individual levels. Overall, the mapped B-cell linear epitopes filled in the gaps in the study of LYS epitopes, and the results may provide theoretical support for the following immunotherapy of egg allergy.
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Affiliation(s)
- Qian Wang
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R. China
- College of Food Science & Technology, Nanchang University, Nanchang 330031, P.R. China
| | - Dingjin Ju
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R. China
- College of Chemistry and Chemical Engineering, Nanchang University, Nanchang 330031, P.R. China
| | - Jinyan Gao
- College of Food Science & Technology, Nanchang University, Nanchang 330031, P.R. China
| | - Ping Tong
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R. China
| | - Hongbing Chen
- State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R. China
- Sino-German Joint Research Institute (Jiangxi-OAI), Nanchang University, Nanchang 330047, P.R. China
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Chen JB, James LK, Davies AM, Wu YCB, Rimmer J, Lund VJ, Chen JH, McDonnell JM, Chan YC, Hutchins GH, Chang TW, Sutton BJ, Kariyawasam HH, Gould HJ. Antibodies and superantibodies in patients with chronic rhinosinusitis with nasal polyps. J Allergy Clin Immunol 2016; 139:1195-1204.e11. [PMID: 27658758 PMCID: PMC5380656 DOI: 10.1016/j.jaci.2016.06.066] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 05/07/2016] [Accepted: 06/13/2016] [Indexed: 01/19/2023]
Abstract
Background Chronic rhinosinusitis with nasal polyps is associated with local immunoglobulin hyperproduction and the presence of IgE antibodies against Staphylococcus aureus enterotoxins (SAEs). Aspirin-exacerbated respiratory disease is a severe form of chronic rhinosinusitis with nasal polyps in which nearly all patients express anti-SAEs. Objectives We aimed to understand antibodies reactive to SAEs and determine whether they recognize SAEs through their complementarity-determining regions (CDRs) or framework regions. Methods Labeled staphylococcal enterotoxin (SE) A, SED, and SEE were used to isolate single SAE-specific B cells from the nasal polyps of 3 patients with aspirin-exacerbated respiratory disease by using fluorescence-activated cell sorting. Recombinant antibodies with “matched” heavy and light chains were cloned as IgG1, and those of high affinity for specific SAEs, assayed by means of ELISA and surface plasmon resonance, were recloned as IgE and antigen-binding fragments. IgE activities were tested in basophil degranulation assays. Results Thirty-seven SAE-specific, IgG- or IgA-expressing B cells were isolated and yielded 6 anti-SAE clones, 2 each for SEA, SED, and SEE. Competition binding assays revealed that the anti-SEE antibodies recognize nonoverlapping epitopes in SEE. Unexpectedly, each anti-SEE mediated SEE-induced basophil degranulation, and IgG1 or antigen-binding fragments of each anti-SEE enhanced degranulation by the other anti-SEE. Conclusions SEEs can activate basophils by simultaneously binding as antigens in the conventional manner to CDRs and as superantigens to framework regions of anti-SEE IgE in anti-SEE IgE-FcεRI complexes. Anti-SEE IgG1s can enhance the activity of anti-SEE IgEs as conventional antibodies through CDRs or simultaneously as conventional antibodies and as “superantibodies” through CDRs and framework regions to SEEs in SEE–anti-SEE IgE-FcεRI complexes.
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Affiliation(s)
- Jiun-Bo Chen
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Louisa K James
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; MRC & Asthma UK Centre for Allergic Mechanisms of Asthma, King's College London, Guy's Campus, London, United Kingdom
| | - Anna M Davies
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; MRC & Asthma UK Centre for Allergic Mechanisms of Asthma, King's College London, Guy's Campus, London, United Kingdom
| | - Yu-Chang Bryan Wu
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; MRC & Asthma UK Centre for Allergic Mechanisms of Asthma, King's College London, Guy's Campus, London, United Kingdom
| | - Joanne Rimmer
- Allergy and Rhinology, Royal National Throat Nose Ear Hospital, London, United Kingdom
| | - Valerie J Lund
- Allergy and Rhinology, Royal National Throat Nose Ear Hospital, London, United Kingdom
| | - Jou-Han Chen
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - James M McDonnell
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; MRC & Asthma UK Centre for Allergic Mechanisms of Asthma, King's College London, Guy's Campus, London, United Kingdom
| | - Yih-Chih Chan
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; MRC & Asthma UK Centre for Allergic Mechanisms of Asthma, King's College London, Guy's Campus, London, United Kingdom
| | - George H Hutchins
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom
| | - Tse Wen Chang
- Genomics Research Center, Academia Sinica, Taipei, Taiwan
| | - Brian J Sutton
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; MRC & Asthma UK Centre for Allergic Mechanisms of Asthma, King's College London, Guy's Campus, London, United Kingdom
| | - Harsha H Kariyawasam
- Allergy and Rhinology, Royal National Throat Nose Ear Hospital, London, United Kingdom
| | - Hannah J Gould
- Randall Division of Cell and Molecular Biophysics, King's College London, London, United Kingdom; MRC & Asthma UK Centre for Allergic Mechanisms of Asthma, King's College London, Guy's Campus, London, United Kingdom.
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Takahashi K, Yuuki T, Takai T, Ra C, Okumura K, Yokota T, Okumura Y. Production of humanized Fab fragment against human high affinity IgE receptor in Pichia pastoris. Biosci Biotechnol Biochem 2000; 64:2138-44. [PMID: 11129586 DOI: 10.1271/bbb.64.2138] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Binding of allergen-IgE complexes to the high affinity IgE receptor (Fc epsilonRI) on mast cells and basophils leads to the release of various mediaters such as histamine. Fab fragments prepared by the papain digestion of humanized antibody against human Fc epsilonRI inhibited the release of histamine from human basophils. Here we established an expression system to directly produce Fab fragments of the humanized anti-human Fc epsilonRI antibody in methylotropic yeast, P. pastoris. Fab fragments were efficiently secreted into the medium at a concentration of 10-40 mg/L using a signal sequence from the P. pastoris phosphatase gene. They were consisted of disulfide-linked light and heavy chains correctly starting from the first amino acid residues by proper cleavage of the signal peptides. The obtained Fab fragments inhibited the binding between IgE and Fc epsilonRI as efficiently as the counterpart prepared by papain digestion of the whole antibody.
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Affiliation(s)
- K Takahashi
- Foods & Pharmaceuticals Research & Development Laboratory, Asahi Breweries Ltd., Kitasoma-gun, Ibaraki, Japan.
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