Linear 23 peptide capable of coupling single B cell epitope or hapten to prepare immunomodulating peptide and antibody and application thereof
An immunoregulatory, B cell technology, applied in the fields of immunology, pharmacy and medicine, to improve immunogenicity, improve symptoms, and increase CD4+
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[0027] Example 1: Preparation of 23-peptide LP1 containing T helper epitopes (Th epitopes).
[0028] The 23 peptide was designated LP1, and the amino acid sequence is shown in SEQ ID No. 1. LP1 is transformed from a Th2 cell epitope. This Th2 cell epitope is derived from a P277 peptide at positions 437 to 460 on the human heat shock protein HSP60. The N-terminal of the P277 peptide has a Th2 composed of 13 amino acids. Epitope P2, a linking peptide consisting of 10 amino acid residues is added to its N-terminus to form LP1. The amino acid sequence of the linking peptide consisting of 10 amino acid residues is shown in SEQ ID No. 2, named L1, which contains A B cell epitope derived from human islet cell-specific antigen-insulinoma-associated protein-2 (IA-2) near membrane region JM2, its amino acid sequence is: FEYQD, named IA2(5), at its N-terminus Add amino acid Gly, add 4 amino acid sequence peptide SGTI at the C-terminus to form L1.
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[0029] Example 2: Preparation of B cell epitopes or synthetic peptide haptens.
[0030] Using a variety of B cell antigen epitope analysis software and online analysis tools, based on a single parameter, combined with secondary structure prediction and spatial structure characteristics, respectively, from a target antigen protein (such as: human DPP4 or human XOD or human uric acid transporter protein). 1) Select a number of dominant B cell antigen epitopes or peptide haptens from more than 100 epitopes. By connecting with 23 peptides, through the process of screening, re-engineering and re-screening in immunized animal experiments, a highly immunogenic B cell can be obtained. B cell epitopes or synthetic peptide haptens.
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[0031] Example 2-1: Preparation of the dominant B cell antigen epitope of human dipeptidyl peptidase 4 (dipeptidyl peptidase 4, DPP4) by selecting multiple predicted dominant B cell antigen epitopes from its more than 100 epitopes B-cell epitopes or peptide haptens with high immunogenicity such as D1 are obtained through screening of immunized animal experiments. D41 is a polypeptide sequence 88VFLENSTFDE97 of DPP4, with a total of 10 amino acid residues, and the amino acid sequence is shown in SEQ ID No.3.
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