Preparation and Application of Hexahistidine-tagged Protein Immunoaffinity Purification Enrichment Column
A technology of hexahistidine and tagged proteins, applied in the field of biological separation, purification and enrichment devices, can solve the problems of limited application of target proteins, poor detection and purification effects, severe elution conditions, etc., to achieve accurate separation, even The effect of high coupling rate and high coupling density
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Embodiment 1
[0044] Preparation of the His-specific polyclonal antibody of embodiment 1 immunoaffinity purification
[0045] 1.1 His short peptide hapten design
[0046]Using 4 groups of amino acid residues in His hexahistidine, divide them into 2 groups and introduce cysteine sulfhydryl SH groups in opposite directions to prepare thiolated His short peptides.
[0047] 1.2 His short peptide immunogen preparation
[0048] Take 5mg / mLKLH10mL, add 100μL saturated Na 2 CO 3 , then add 1mL of 10% SDS, mix well, boil for 5 minutes to denature, then react with iodoacetyl-NHS to generate iodoacetylated KLH, remove excess iodoacetic acid by G25Sephadex, add 55mg of His short peptide hapten, adjust pH=8.5 After reacting at room temperature for 60 minutes, the His-KLH covalent bond complex was obtained, which was obtained after desalting with G25Sephadex as the immune antigen. Using ovalbumin OVA as the carrier protein, the coating antigen His-OVA for detection was prepared by the same method. ...
Embodiment 2
[0061] Example 2 Preparation of high-density His-tagged recombinant protein immunoaffinity purification enrichment column.
[0062] 2.1 Transfer 3 mL of Agarose activated by sodium iodate into the column, wash with 100 mL of distilled water, drip dry, and pass through 0.1 mol / L Na of 2 times the volume of Agarose 2 CO 3 , drip dry and set aside;
[0063] 2.2 Add 300 mg of immunoaffinity-purified His-specific polyclonal antibody with 0.1 mol / L Na 2 CO 3 Dissolve to make the concentration reach 20mg / mL, centrifuge to take the supernatant after complete dissolution;
[0064] 2.3 Add the supernatant to the affinity column in step 2.1, collect the effluent and pass through the column again, repeat 3-5 times;
[0065] 2.4 Wash out the unbound antibodies with 20mL distilled water and collect them together;
[0066] 2.5 Prepare 1.2 mL of sodium borohydride solution with a concentration of 10 mg / mL with distilled water, add it to the column, shake and mix, and react at 4 °C for 30...
Embodiment 3H
[0070] Embodiment 3His-specific antibody-labeled horseradish peroxidase
[0071] 3.1 Weigh 5 mg immunoaffinity purified His-specific polyclonal antibody, dissolve in 100 μL 0.1mol / L Na 2 CO 3 , react for 10 minutes, according to the amount of antibody: horseradish peroxidase = 1:1, add 5 mg of activated horseradish peroxidase, mix well;
[0072] 3.2 Add 1 mg of sodium borohydride, mix well and exhaust, place at -20°C for 1 minute, then move to 4°C for 2 hours;
[0073] 3.3 Desalted by G25Sephadex desalting column;
[0074] 3.4 Add BSA so that the final concentration of BSA is 1 mg / mL, add 50% glycerol, and detect the titer of the labeled antibody by ELISA.
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