酪氨酸蛋白激酶抑制剂的高通量筛选模型

目的建立酪氨酸激酶抑制剂的高通量筛选模型。方法以多聚酪氨酸多肽为底物,用提取的酪氨酸激酶催化酪氨酸的磷酸化,用酶标记的单克隆抗体检测酪氨酸激酶的活性,根据待测样品对激酶活性的抑制程度,筛选酪氨酸激酶抑制剂。结果酶标板包被液的浓度为20mg·L-1PGT,使用25mg·L-1蛋白质的PTK初提物,在37℃条件下孵育60min,再使用2000倍稀释的辣根过氧化物酶标记的小鼠抗磷酸化酪氨酸单克隆抗体IgG2bk与反应产物结合、测定。同一微孔板各样品间的测定误差为0.26,微孔板间和日间的测定误差分别为0.79和0.69。Genistein对PTK的IC50为110μmol·L-1。从收集的7680个样品中,筛选出具有活性的样品16个,选中率约2‰。结论建立的酪氨酸激酶抑制剂高通量药物筛选模型,具有灵敏度高、结果稳定的特性,在每块实验上同时设立空白和对照,测定结果具有可比性。

HTS model for protein tyrosine kinase inhibitors

Aim To introduce a high throughput screen model for PTK inhibitors. Methods With tyrosine containing polypeptides as substrate, in reaction buffer PTK extracts catalyzed the phosphorylation of tyrosine residues. ELISA method was used to measure the activity of protein tyrosine kinase. Resutls The IC_ 50 of genistein was 110 μmol·L -1. From more than 7000 samples, 16 were found to possess some degree of PTK inhibiting activity. Conclusion This HTS model for screening PTK inhibitors was stable and sensitive.