Delayed-type allergic reaction antigen epitope polypeptides of mycobacterium bovis CFP-10 and application thereof
A technology of CFP-10 and Mycobacterium bovis, applied in the direction of application, fusion polypeptide, peptide, etc., can solve the problem of poor specificity in the diagnosis of tuberculosis, and achieve the effects of facilitating mass production, mediating a high level of cellular immunity, and increasing expression
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Embodiment 1
[0088] Identification of the Delayed Hypersensitivity Epitope of Example 1 Mycobacterium bovis CFP-10
[0089] method:
[0090] 1. Identification of delayed-type allergic reaction of Mycobacterium bovis CFP-10
[0091] 1.1 Primer Design for the Amplification of Mycobacterium bovis CFP-10 Gene
[0092] Design a pair of primers according to the CFP-10 gene sequence of Mycobacterium bovis H37Rv strain (NC_000962.3) registered in GenBank, introduce a protective base and an EcoRI restriction site at the 5' end of the forward upstream primer, and introduce a reverse downstream primer A protective base, a HindIII restriction site and a stop codon were introduced into the 5' end (see Table 1). The underlined part is the restriction endonuclease restriction site, and the primers were synthesized by Beijing Huada Gene Company.
[0093] Table 1 Mycobacterium bovis CFP-10 gene amplification primers
[0094]
[0095] 1.2 PCR reaction and PCR product recovery
[0096] Amplify using g...
Embodiment 2
[0216] Example 2 Preparation and preliminary application of bovine tuberculosis new skin test diagnostic antigen
[0217] method:
[0218] 1. Design, optimization and synthesis of skin test diagnostic antigen gene
[0219] The identified DTH antigen peptide C-P C (shown in SEQ ID NO.1, 20aa) and C-P B7 (shown in SEQ ID NO.2, 25aa) and M-P 11 (shown in SEQ ID NO.5, 25aa) is connected in series, as image 3 As shown, at the B position, that is, the linker (amino acid sequence is GGGGS) is used to connect the antigenic peptides, and the Linker is also introduced at the end of the tandem peptide (C site), but the difference is that it encodes the last two amino acids of the Linker (GS) The nucleotide sequence must be a BamHI restriction site. In addition, a BglII restriction site is introduced at the front end (A site) of the tandem peptide nucleotide sequence, an XhoI restriction site is introduced at the end (E site), and a stop codon is introduced before the XhoI restricti...
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