A method for detecting DNA glycosylase activity based on single quantum dot level
A glycosylase, level detection technology, applied in the field of biological analysis, can solve the problems of complex operation, low detection limit, cumbersome operation, etc., and achieve the effects of high resolution characteristics, improved efficiency, and high sensitivity
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Embodiment 1
[0035] Preparation of Incubation Buffer: 100 mmol / L Tris(hydroxymethyl)aminomethane-hydrochloric acid (Tris-HCl), 10 mmol / L ammonium acetate, 3 mmol / L magnesium chloride, 0.83 nanosulfur mol / liters of quantum dots (605QDs), pH 8.0.
[0036] Preparation of anti-quenching buffer: 67 mmol / L glycine-potassium hydroxide (pH 9.4), 2.5 mmol / L magnesium chloride, 50 µg / mL bovine serum albumin, 1 mg / mL glucose oxidase , 0.04% mg / mL catalase, 0.4% (mass / volume) D-glucose.
[0037] Cell extract preparation: Human lung adenocarcinoma cells (A549) were cultured in Dulbecco's modified Eagle's medium (DMEM) containing 10% fetal bovine serum (FBS) and 1% penicillin-streptomycin. 5% carbon dioxide, 37 degrees incubator culture. When the cells reached the logarithmic growth phase, they were digested with trypsin, washed twice with phosphate buffered saline (PBS) pH 7.4, and then centrifuged at 1000 rpm for 5 minutes at 4°C. Cells were suspended in 100 microliters of lysis buffer, lysed on i...
Embodiment 2
[0043] 2.1 Experimental verification of the principle
[0044] In order to verify the feasibility of DNA glycosylase hOGG1 in extracellular base excision repair, the inventors detected and analyzed the repair reaction products, and the results are as follows figure 2 shown. First of all, the present invention uses non-denaturing polyacrylamide gel (PAGE) electrophoresis to carry out verification analysis. from figure 2A It can be seen that without DNA glycosylase hOGG1, there is only a 25bp band, indicating that the excision repair reaction does not occur. In the presence of DNA glycosylase hOGG1, two bands with lengths of 25bp and 12nt were seen, indicating that one of the DNA strands was cut, resulting in a small fragment of 12nt. The above results show that the DNA glycosylase hOGG1 can specifically recognize and cleave 8-oxoguanine (8-oxoG), and under the cleavage of apurine endonuclease-1 (APE1), the abasic site (APsite ) leaves a nucleotide gap. Cy5-dGTP is added ...
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