Antibacterial proteins
A technology of antibacterial protein and Escherichia coli, applied in the field of biochemistry, can solve the problems of inconsistent quality of raw materials and chemical residues
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Embodiment 1
[0053] Example 1: LYS-ABP gene acquisition
[0054] Design the polypeptide sequence of LYS-ABP gene according to Genbank, and then design the LYS-ABP gene sequence according to the principle of optimal password, synthesize the LYS-ABP fusion protein gene sequence through the whole gene, and add EcoRI-HindIII enzyme digestion at both ends site, and the gene sequence is shown in SEQ ID NO:4.
Embodiment 2
[0055] Embodiment 2: the preparation of antimicrobial protein MBP-LYS-ABP
[0056] 1. Construction and transformation of recombinant plasmid pMAL-p2x / LYS-ABP
[0057] The LYS-ABP fusion protein gene fragment synthesized by the whole gene is double-cut with EcoRI-HindIII, and recovered as the fragment to be inserted.
[0058] The expression vector pMAL-p2x was purchased from NEB Company. The pMAL-p2x plasmid was double-cut with EcoRI-HindIII and the large fragment was recovered as a vector. It was ligated with the above-mentioned LYS-ABP fragment with T4 ligase, and then CaCl 2 The method was transformed into E.Coli DH5a, and the specific steps were carried out according to the method in the "Molecular Cloning" manual. The positive clones were screened by enzyme digestion, and those with a band of about 490 bp were plasmids inserted into the target gene, named pMAL-p2x / LYS-ABP.
[0059] The screened recombinant plasmid was transformed into expression strain BL21(DE3)pLysS to ...
Embodiment 3
[0067] Embodiment 3: the preparation of antibacterial protein LYS-ABP
[0068] Prepare 25mM pH8.0 Tris-HCl buffer solution, add Lys-ABP pure product containing MBP into the solution, the final protein concentration is 1 mg per ml, add appropriate amount of thrombin, place at 25°C for 5 hours, and cut to obtain Lys-ABP and MBP The mixture was stored in a 4°C refrigerator for later use.
[0069] Ion exchange chromatography purification: chromatography medium: Q Sepharose Fast Flow; chromatography column specifications: inner diameter 50cm, height 40cm, medium height about 10cm, medium volume about 200mL; monitoring: 280nm; equilibrium solution is 25mM pH8.0 Tris-HCl buffer liquid. First, equilibrate the chromatographic column with more than 5 column volumes with the balance solution, and the flow rate is 20mL / min, then dilute the DNA-digested bacterial liquid sample 3 times with the balance solution, and then load the sample, the flow rate is 20mL / min, after loading the sample, c...
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