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Hu J, Zhu LP, Wang RQ, Zhu L, Chen F, Hou Y, Ni K, Deng S, Liu S, Ying W, Sun JL, Li H, Jin T. Identification, Characterization, Cloning, and Cross-Reactivity of Zan b 2, a Novel Pepper Allergen of 11S Legumin. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:8189-8199. [PMID: 38551197 PMCID: PMC11010233 DOI: 10.1021/acs.jafc.4c00351] [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: 01/12/2024] [Revised: 03/11/2024] [Accepted: 03/13/2024] [Indexed: 04/11/2024]
Abstract
Protein from Sichuan peppers can elicit mild to severe allergic reactions. However, little is known about their allergenic proteins. We aimed to isolate, identify, clone, and characterize Sichuan pepper allergens and to determine its allergenicity and cross-reactivities. Sichuan pepper seed proteins were extracted and then analyzed by SDS-PAGE. Western blotting was performed with sera from Sichuan pepper-allergic individuals. Proteins of interest were purified using hydrophobic interaction chromatography and gel filtration and further analyzed by analytical ultracentrifugation, circular dichroism spectroscopy, and mass spectrometry (MS). Their coding region was amplified in the genome. IgE reactivity and cross-reactivity of allergens were evaluated by dot blot, enzyme-linked immunosorbent assay (ELISA), and competitive ELISA. Western blot showed IgE binding to a 55 kDa protein. This protein was homologous to the citrus proteins and has high stability and a sheet structure. Four DNA sequences were cloned. Six patients' sera (60%) showed specific IgE reactivity to this purified 11S protein, which was proved to have cross-reactivation with extracts of cashew nuts, pistachios, and citrus seeds. A novel allergen in Sichuan pepper seeds, Zan b 2, which belongs to the 11S globulin family, was isolated and identified. Its cross-reactivity with cashew nuts, pistachios, and citrus seeds was demonstrated.
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Affiliation(s)
- Jing Hu
- Hefei
National Laboratory for Physical Sciences at Microscale, the CAS Key
Laboratory of Innate Immunity and Chronic Disease, School of Basic
Medicine Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Li-Ping Zhu
- Allergy
Department, State Key Laboratory of Complex Severe and Rare Diseases,
Peking Union Medical College Hospital, Chinese
Academy of Medical Science and Peking Union Medical College, Beijing 100730, China
| | - Rui-qi Wang
- Allergy
Department, State Key Laboratory of Complex Severe and Rare Diseases,
Peking Union Medical College Hospital, Chinese
Academy of Medical Science and Peking Union Medical College, Beijing 100730, China
| | - Lixia Zhu
- Hefei
National Laboratory for Physical Sciences at Microscale, the CAS Key
Laboratory of Innate Immunity and Chronic Disease, School of Basic
Medicine Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Feng Chen
- Hefei
National Laboratory for Physical Sciences at Microscale, the CAS Key
Laboratory of Innate Immunity and Chronic Disease, School of Basic
Medicine Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Yibo Hou
- Allergy
Department, State Key Laboratory of Complex Severe and Rare Diseases,
Peking Union Medical College Hospital, Chinese
Academy of Medical Science and Peking Union Medical College, Beijing 100730, China
| | - Kang Ni
- Hefei
National Laboratory for Physical Sciences at Microscale, the CAS Key
Laboratory of Innate Immunity and Chronic Disease, School of Basic
Medicine Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Shasha Deng
- Hefei
National Laboratory for Physical Sciences at Microscale, the CAS Key
Laboratory of Innate Immunity and Chronic Disease, School of Basic
Medicine Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Siyu Liu
- Hefei
National Laboratory for Physical Sciences at Microscale, the CAS Key
Laboratory of Innate Immunity and Chronic Disease, School of Basic
Medicine Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
| | - Wantao Ying
- State
Key Laboratory of Medical Proteomics, Beijing Proteome Research Center,
National Center for Protein Sciences (Beijing), Beijing Institute
of Lifeomics, Beijing 102206, China
| | - Jin-Lyu Sun
- Allergy
Department, State Key Laboratory of Complex Severe and Rare Diseases,
Peking Union Medical College Hospital, Chinese
Academy of Medical Science and Peking Union Medical College, Beijing 100730, China
| | - Hong Li
- Allergy
Department, State Key Laboratory of Complex Severe and Rare Diseases,
Peking Union Medical College Hospital, Chinese
Academy of Medical Science and Peking Union Medical College, Beijing 100730, China
| | - Tengchuan Jin
- Hefei
National Laboratory for Physical Sciences at Microscale, the CAS Key
Laboratory of Innate Immunity and Chronic Disease, School of Basic
Medicine Sciences, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui 230027, China
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Gilje E, Bauer M. Citrin allergy is rare but perplexing. Ann Allergy Asthma Immunol 2023; 131:685-686. [PMID: 38044017 DOI: 10.1016/j.anai.2023.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2023] [Accepted: 09/14/2023] [Indexed: 12/05/2023]
Affiliation(s)
- Elizabeth Gilje
- Section of Pediatric Allergy & Immunology, Children's Hospital Colorado, University of Colorado School of Medicine, Aurora, Colorado
| | - Maureen Bauer
- Section of Pediatric Allergy & Immunology, Children's Hospital Colorado, University of Colorado School of Medicine, Aurora, Colorado.
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