Twelve analogues of the antibacterial phenolic peptide 5-S-glutathionyl-N-β-alanyl-L-dopa (5-S-GA-L-D, 1)were synthesized via orthoquinone using tyrosinase. Several synthesized compounds inhibited the v-Src autophosphorylation tyrosine kinase reaction with an IC50 value comparable to that of herbimycin A. The inhibition of c-Src substrate phosphorylation was much less active than v-Src autophosphorylation inhibition. 5-S-GA-L-D (1) and its analogous competed with peptide substrate and non-competed with ATP. The analogues showed no effects on substrate phosphorylation by epidermal crowth factor receptor (EGFR), and this selectivity is the most charagteristic feature of the 5-S-GA-L-D and its analogues (1-12).
合成了十二种抗菌
酚肽5-S-
谷胱甘肽-N-
β-丙氨酸-
L-多巴(5-S-GA-L-D,1)的类似物,采用
酪氨酸酶通过邻醌合成。几种合成的化合物抑制了v-Src自
磷酸化
酪氨酸激酶反应,其IC50值与草甘霖A相当。c-Src底物
磷酸化的抑制活性远低于v-Src自
磷酸化的抑制活性。5-S-GA-L-D(1)及其类似物与肽底物竞争,但不与
ATP竞争。这些类似物对
表皮生长因子受体(
EGFR)的底物
磷酸化没有影响,这种选择性是5-S-GA-L-D及其类似物(1-12)最显著的特征。