1. Effects of Glycosylation Combined with Phosphate Treatment on the Allergenicity and Structure of Tropomyosin in Litopenaeus vannamei .
- Author
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Sun QF, Xia F, Li MS, Zhang HL, Liao YN, Liu QM, Liu M, Chen GX, Luo LZ, and Liu GM
- Subjects
- Animals, Female, Humans, Mice, Arthropod Proteins immunology, Arthropod Proteins chemistry, Food Hypersensitivity immunology, Glycosylation, Immunoglobulin G immunology, Immunoglobulin G chemistry, Mice, Inbred BALB C, Shellfish analysis, Shellfish Hypersensitivity immunology, Th2 Cells immunology, Th2 Cells drug effects, Allergens immunology, Allergens chemistry, Immunoglobulin E immunology, Penaeidae immunology, Penaeidae chemistry, Phosphates chemistry, Tropomyosin immunology, Tropomyosin chemistry
- Abstract
Tropomyosin (TM) is the main allergen in shrimp ( Litopenaeus vannamei ). In this study, the effects of allergenicity and structure of TM by glycosylation (GOS-TM), phosphate treatment (SP-TM), and glycosylation combined with phosphate treatment (GOS-SP-TM) were investigated. Compared to GOS-TM and SP-TM, the IgG/IgE binding capacity of GOS-SP-TM was significantly decreased with 63.9 ± 2.0 and 49.7 ± 2.7%, respectively. Meanwhile, the α-helix content reduced, surface hydrophobicity increased, and 10 specific amino acids (K
30 , K38 , S39 , K48 , K66 , K74 , K128 , K161 , S210 , and K251 ) were modified by glycosylation on six IgE linear epitopes of GOS-SP-TM. In the BALB/c mice allergy model, GOS-SP-TM could significantly reduce the levels of specific IgE, IgG1, and CD4+ IL-4+ , while the levels of IgG2a, CD4+ CD25+ Foxp3+ , and CD4+ IFN-γ+ were increased, which equilibrated Th1 and Th2 cells, thus alleviating allergic symptoms. These results indicated that glycosylation combined with phosphate treatment can provide a new insight into developing hypoallergenic shrimp food.- Published
- 2024
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