Indirect ELISA detection kit for detecting novel goose astrovirus antibody and application thereof
A detection kit and astrovirus technology, applied in the field of biological products, can solve the problems of lack of vaccine immunization and prevention and control measures, unreported new virus serological detection methods, and economic loss of meat goose breeding industry.
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[0041] (1) Preparation of coated antigen:
[0042] The whole gene sequence of the new goose astrovirus was obtained by next-generation sequencing technology, and its whole gene sequence is shown in SEQ ID NO.3; according to the obtained ORF1b protein gene of the new goose astrovirus, two primers were designed:
[0043]Upstream primer ORF1b-F: 5'-ATGTTTGAAAAATTTTTCTATC-3';
[0044] Downstream primer ORF1b-R: 5'-CCAGATTTGAGAAAAAGAAGTC-3'.
[0045] The ORF1b gene sequence (as shown in SEQID NO.4) with a length of 1287bp was amplified by the general RT-PCR method with the above primers, and purified by gel electrophoresis and gel recovery, and the purified product was cloned into prokaryotic expression In the vector PET-28a(+), the recombinant prokaryotic expression vector PET28a-ORF1b was constructed; the recombinant prokaryotic expression vector PET-ORF1b was transformed into BL21(DE3) competent cells, and the recombinant protein ORF1b was highly expressed by 1mM IPTG induction...
Embodiment 1
[0069] Example 1: Preparation of Coated Antigen
[0070] 1.1 Design and synthesis of specific primers: According to the whole gene sequence (shown in SEQ ID NO.3) of the new goose astrovirus (preservation number is CCTCC NO: V201808), a pair of primers were designed on the ORF1b protein gene sequence, and the two primers were The segments are respectively provided with BamHI and SalI restriction sites, and it is estimated that a 1287bp gene fragment (shown in SEQ ID NO.4) in the novel goose Astrovirus genome can be amplified.
[0071] Upstream primer ORF1b-F: 5'-ATGTTTGAAAAATTTTTCTATC-3';
[0072] Downstream primer ORF1b-R: 5'-CCAGATTTGAGAAAAAGAAGTC-3'.
[0073] 1.2 Construction of PET28a-ORF1b prokaryotic expression vector:
[0074] The ORF1b gene fragment was amplified by PCR using specific upstream and downstream primers, the purified fragment was ligated with the PMD18-T vector, the ligated product was transformed into DH5α competent cells, and positive colonies were pic...
Embodiment 2
[0082] Embodiment 2: Indirect ELISA detection novel goose Astrovirus antibody
[0083] The purified recombinant protein ORF1b in Example 1 was used as the coating antigen to establish an indirect ELISA method, and the optimal protein coating concentration and serum dilution concentration of ELISA, as well as the optimal reaction conditions of ELISA were explored by using the square array method. The final conditions are as follows:
[0084] 2.1 Coating: Dilute the antigen with 1×carbonate buffer (pH=9.6) at 1:1000, take 10 μL and coat it into a 96-well ELISA plate, wrap it in plastic wrap, incubate at 37°C for 2 hours, and use 0.05% Wash with Tween PBST three times, 4 min each time. Detection hole ORF1b protein coating amount 500ng / well;
[0085] 2.2 Sealing: Dilute 200 μL / well of 5% skimmed milk powder with PBST for sealing, incubate at 37°C for 1 hour, spin dry, wash with PBST 3 times, 4 minutes each time;
[0086] 2.3 Serum action conditions: Add 10 μL of the serum to be...
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