EB virus BFRF3-BZLF1 fusion protein, gene, vector containing same, host cell, test strip and production method and application thereof
A technology of BFRF3-BZLF1 and Epstein-Barr virus, applied in the field of bioengineering, can solve the problems of not being able to obtain high sensitivity and high specificity at the same time, easily causing missed diagnosis, and increasing specificity, so as to achieve improved specificity and sensitivity, high specificity, Effects with low specificity
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Embodiment 1
[0036] Example 1 Design and cloning of Epstein-Barr virus BFRF3-BZLF1 fusion protein
[0037] 1. Selection of amino acid sequence of fusion protein
[0038] The BFRF3 protein selects 83 amino acids at its N-terminal, the amino acid sequence is shown in SEQ ID NO: 3, and the sequence structure of the SEQ ID NO: 3 is as follows:
[0039] Met Ala Arg Arg Leu Pro Lys Pro Thr Leu Gln Gly Arg Leu Glu Ala AspPhe Pro Asp Ser Pro Leu Leu Pro Lys Phe Gln Glu Leu Asn Gln Asn Asn Asn Leu ProAsn Asp Val Phe Arg Glu Ala Gln Arg Ser Tyr Leu Val Phe Leu Thr Ser Gln PheCys Tyr Glu Glu Tyr Val Gln Arg Thr Phe Gly Val Pro Arg Arg Gln Arg Ala IleAsp Lys Arg Gln Arg Ala Ser Val Ala.
[0040] The BZLF1 protein selects 90 amino acids at its C-terminus, the amino acid sequence is shown in SEQ ID NO: 4, and the sequence structure of the SEQ ID NO: 4 is as follows:
[0041] Ala Arg Arg Thr Arg Lys Pro Gln Gln Pro Glu Ser Leu Glu Glu Cys AspSer Glu Leu Glu Ile Lys Arg Tyr Lys Asn Arg Val Ala Ser Arg L...
Embodiment 2
[0051] Example 2 Expression of Epstein-Barr virus BFRF3-BZLF1 fusion protein
[0052] 1. Construction of expression plasmid
[0053] The cloned plasmid was double-digested with NdeI and XhoI. The endonucleases NdeI and XhoI were both purchased from NEB Company. The excised target gene was connected to the pET-30a expression vector with ligase. The T4 DNA ligase enzyme provided by the company is the constructed expression plasmid.
[0054] Transform the competent cells E. coli BL21(DE3) with the expression plasmid for small-scale expression. The target protein band size is about 20KDa. Pick positive clones and divide them into plates on the bacterial culture dish, and perform small-scale expression again , pick positive clones to extract plasmids, carry out enzyme digestion identification, and send the identified positive samples to the sequencing company for sequencing to confirm the correctness of the expression plasmid construction, such as figure 1 It is a flowchart of th...
Embodiment 3
[0057] Example 3 Application of EB virus BFRF3-BZLF1 fusion protein in EB virus ELISA detection
[0058] ELISA detection principle: use the recombinant antigen prepared by the present invention to coat the plate, add the serum to be tested, after the antibody in the serum is combined with the plate antigen, use the enzyme-labeled anti-human secondary antibody to combine with the antibody, and develop the color measurement result.
[0059] (1) Antigen coating: the purified recombinant BFRF3-BZLF1 fusion protein was coated with diluent (35mM NaHCO 3 ,15mM Na 2 CO 3 , pH9.6) was diluted to a concentration of 100 μg / mL. Add 100 μL to each well on the ELISA plate, 37°C, 3h.
[0060] (2) Plate washing: wash the microtiter plate 5 times with PBST (PBS containing 0.05% Tween-20).
[0061] (3) Blocking: add 100 μL / well of 5% bovine serum albumin (BSA) blocking solution (prepared in PBST), and block at 37° C. for 1 hour.
[0062] (4) Plate washing: Same as above.
[0063] (5) Prim...
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