New Renin Inhibitors with Pseudodipeptidic Units in P1-P1' and P2'-P3' Positions.
作者:Ryszard Paruszewski、Pawel Jaworski、Iwona Winiecka、Jadwiga Tautt、Jadwiga Dudkiewicz
DOI:10.1248/cpb.50.850
日期:——
A series of four new potential renin inhibitors has been synthesized. The structure of the compounds was designed in such a way as to produce agents resistant to enzymatic degradation, metabolically stable, possibly potent and with improved oral absorption. All positions of the 8—13 fragment of the human angiotensinogen were occupied by unnatural units (two unnatural amino acids in positions P3 and P2 and two pseudodipeptides in positions P1–P1′ and P2′–P3′). Both N- and C-terminal functions of the inhibitors were blocked with tert-Boc and ethyl ester groups. Their hydrophobicity evaluated as a log P value, calculated by a computer method, was 6.57 and 6.08 respectively. All peptides were obtained by the carbodiimide method in solution and purified by chromatography on the SiO2 column. Their resistance to enzymatic degradation was assayed by determination of stability against chymotrypsin activity. The potency was measured in vitro by a spectrofluorimetric method (assay of Leu-Val-Tyr-Ser released from the N-acetyltetradecapeptide substrate by renin in the presence of the inhibitor). All inhibitors were stable to chymotrypsin. Their IC50 (M/l) values were: 9.6×10−4 (12), 1.6×10−5 (17), 1.0×10−5 (22) and 1.0×10−5 (23) respectively.
一系列四种新的潜在肾素抑制剂已被合成。这些化合物的结构经过精心设计,可产生抗酶降解、代谢稳定、可能有效且口服吸收改善的药物。人血管紧张素原8-13片段的所有位置都被非天然单位占据(P3和P2位上的两个非天然氨基酸和P1-P1'和P2'-P3'位上的两个假二肽)。抑制剂的 N 端和 C 端功能均被叔 Boc 和乙酯基团阻断。它们的疏水性通过计算机方法计算的log P值分别为6.57和6.08。所有肽均通过溶液中的碳二亚胺法获得,并通过 SiO2 柱色谱纯化。通过测定胰凝乳蛋白酶活性的稳定性来测定它们对酶促降解的抵抗力。通过荧光分光光度法在体外测量效力(在抑制剂存在下测定肾素从 N-乙酰基十四肽底物释放的 Leu-Val-Tyr-Ser)。所有抑制剂对胰凝乳蛋白酶均稳定。它们的IC50(M/l)值分别为:9.6×10−4(12)、1.6×10−5(17)、1.0×10−5(22)和1.0×10−5(23)。