Identification of IgE and IgG epitopes on native Bos d 4 allergen specific to allergic children.
Alpha-lactalbumin (ALA) is one of the major allergens in cow's milk. However, research on its conformational epitopes has been relatively limited. In our study, specific antibodies against cow's milk ALA were purified from eight children by two-step affinity chromatography. Subsequently, mimotopes against IgG and IgE were biopanned from Ph.D.-12 and Ph.D.-C7C, respectively. Based on the mimotopes, linear epitopes were defined with the UniProt alignment tool. Conformational epitopes were computed using the Pepitope Server. Six IgE and seven IgG linear epitopes were identified. Meanwhile, five IgE and three IgG conformational epitopes were revealed with PyMOL. The results showed that common residues were identified in both IgE and IgG epitopes and some residues of the conformational epitopes were composed of linear epitopes on bovine α-lactalbumin. The results indicated that the data could be used for developing hypoallergenic dairy products on the basis of epitopes and providing a diagnostic tool for the assessment of patients who are allergic to cow's milk.
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R.China and School of Food Science & Technology, Nanchang University, Nanchang 330047, P.R.China.
Xin
X
Li
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R.China and School of Food Science & Technology, Nanchang University, Nanchang 330047, P.R.China.
Shuilin
S
Yuan
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R.China and School of Food Science & Technology, Nanchang University, Nanchang 330047, P.R.China.
Meijia
M
Huang
School of Food Science & Technology, Nanchang University, Nanchang 330047, P.R.China.
Jinyan
J
Gao
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R.China and Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, P.R.China. chbgjy@hotmail.com.
Zhihua
Z
Wu
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R.China and School of Food Science & Technology, Nanchang University, Nanchang 330047, P.R.China.
Ping
P
Tong
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R.China and Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, P.R.China. chbgjy@hotmail.com.
Anshu
A
Yang
State Key Laboratory of Food Science and Technology, Nanchang University, Nanchang 330047, P.R.China and Jiangxi-OAI Joint Research Institute, Nanchang University, Nanchang 330047, P.R.China. chbgjy@hotmail.com.
Hongbing
H
Chen
D000485:Allergens / Q000276:immunology; D000818:Animals; D002648:Child; D002675:Child, Preschool; D002846:Chromatography, Affinity; D018604:Epitope Mapping; D000939:Epitopes / Q000276:immunology*; D005260:Female; D006801:Humans; D007073:Immunoglobulin E / Q000097:blood* / Q000276:immunology; D007074:Immunoglobulin G / Q000097:blood* / Q000276:immunology; D007223:Infant; D007768:Lactalbumin / Q000097:blood / Q000276:immunology; D008297:Male; D008892:Milk / Q000737:chemistry / Q000276:immunology; D016269:Milk Hypersensitivity / Q000276:immunology*; D011487:Protein Conformation
D000485:Allergens; D000939:Epitopes; D007074:Immunoglobulin G; D007073:Immunoglobulin E; D007768:Lactalbumin