DNA glycosylase activity assay based on streptavidin paramagnetic bead substrate capture.
DNA glycosylase activity assay based on streptavidin paramagnetic bead substrate capture.
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DOI：
10.1006/abio.2001.5400
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发表时间：
2001-11
影响因子：
2.9
通讯作者：
L. Xia;T. O'Connor
中科院分区：
文献类型：
--
作者：
L. Xia;T. O'Connor
A method to detect DNA glycosylase activity is described. The substrate used was an oligodeoxyribonucleotide with a unique hypoxanthine base, but has general application to any DNA glycosylase or endonuclease. The oligodeoxyribonucleotide was labeled at the 5' end with 32P and at the 3' end with a biotin linkage and annealed to a complementary oligodeoxyribonucleotide. The hypoxanthine base was excised in solution using the MPG protein, a human DNA glycosylase. Following cleavage of the phosphodiester linkage by NaOH, the oligodeoxyribonucleotide was attached to streptavidin-coated, paramagnetic beads. Binding of the labeled oligodeoxyribonucleotide to the beads was indicative of the kinetics of the reaction. As a control, half of the reaction products were loaded on to a denaturing polyacrylamide gel. Comparable values for steady-state kinetic constants were obtained using both methods. This nonelectrophoretic technique is a rapid assay of DNA glycosylase activity for both purified proteins and crude extracts. This method can be directly adapted for high-throughput techniques.
