Tyropeptin A, a potent proteasome inhibitor, was isolated from the culture broth of Kitasatospora sp. MK993-dF2. We synthesized the derivatives of tyropeptin A to enhance its inhibitory potency. Among the synthesized derivatives, the most potent compound, TP-104, exhibited a 20-fold inhibitory potency enhancement for chymotrypsin-like activity of 20S proteasome compared to tyropeptin A. Additionally, TP-110 specifically inhibited the chymotrypsin-like activity, but did not inhibit the post-glutamyl-peptide hydrolyzing (PGPH) and the trypsin-like activities of 20S proteasome. In vitro TP-110 strongly inhibited the growth of various cell lines.
一种强效的
蛋白酶体
抑制剂——泰洛霉素A,从北里孢菌MK993-dF2的培养液中分离出来。为了增强其抑制效能,我们合成了泰洛霉素A的衍
生物。在这些合成的衍
生物中,最有效的化合物TP-104,相对于泰洛霉素A,对20S
蛋白酶体的糜
蛋白酶样活性显示出20倍的抑制效能提升。此外,TP-110特异性地抑制糜
蛋白酶样活性,但不影响20S
蛋白酶体的谷
氨酰肽
水解后(
PGPH)和胰
蛋白酶样活性。在体外实验中,TP-110强烈抑制了多种
细胞系的生长。