Poststatin, a New Inhibitor of Prolyl Endopeptidase. V. Endopeptidase Inhibitory Activity of Poststatin Analogues.
作者:MAKOTO TSUDA、YASUHIKO MURAOKA、MACHIKO NAGAI、TAKAAKI AOYAGI、TOMIO TAKEUCHI
DOI:10.7164/antibiotics.49.890
日期:——
Thirty analogues of poststatin were synthesized, and their inhibitory activities against prolyl endopeptidase, human leukocyte elastase and cathepsin B were measured. The α-ketone was essential and the S configuration was preferable to the R configuration in the β-substituted-β-amino-α-oxopropionic acid moiety of poststatin analogues for endopeptidase inhibitory activity. The analogue in which the D-leucine residue of poststatin was replaced by L-leucine showed strong inhibitory activity to cathepsin B. Introduction of an aromatic group into the P4 position and proline into the P2 position increased inhibitory activity to elastase. Benzyloxycarbonyl-L-homophenylalanyl-(RS)-3-amino-2-oxovaleryl-D-leucyl-L-valine was about 6 times more active to prolyl endopeptidase than natural poststatin.
合成了30个波杀菌蛋白类似物,并测定了它们对脯氨酰内肽酶、人白细胞弹性蛋白酶和组织蛋白酶B的抑制活性。对内肽酶抑制活性来说,α–酮基非常重要,β–取代–β–氨基–α–氧代丙酸部分的S构型比R构型更为优越。用L–亮氨酸代替波杀菌蛋白中的D–亮氨酸得到的类似物对组织蛋白酶B具有很强的抑制活性。将芳香基团引入到P4位和将脯氨酸引入到P2位使对弹性蛋白酶的抑制活性增强。苄氧羰基–L–高苯丙氨酰–(RS)–3–氨基–2–氧代戊二酰–D–亮氨酰–L–缬氨酸对脯氨酰内肽酶的活性约为天然波杀菌蛋白的6倍。