An investigation of angiotensin II agonist and antagonist analogs with 5,5-dimethylthiazolidine-4-carboxylic acid and other constrained amino acids
作者:J. Samanen、T. Cash、D. Narindray、E. Brandeis、W. Adams、H. Weideman、T. Yellin、D. Regoli
DOI:10.1021/jm00114a012
日期:1991.10
[Sar1]ANG II and [Sar1,Ile8]ANG II containing a C7 conformation in position 7 are preferred for both ANG II agonist and antagonist activity. Incorporation of the L,L-lactam-Phe modification into [Sar1]ANG II gives a pure ANG II antagonist (pA2 8.3), comparable to saralasin (pA2 8.6). In positions 3, 5, and 7 the conformational requirements for the ANG II agonist [Sar1]ANG II and the ANG II antagonist [Sar1
为了探测血管紧张素II(ANG II)八肽激动剂和拮抗剂的受体结合构象要求,[Sar1] ANG II激动剂和[Sar1,X8] ANG II拮抗剂类似物的合成和生物学活性(X8 = Ile,D-Phe (或Aib)在位置3、5和7处受到构象约束的情况进行了研究,并与以前的文献进行了比较。检查的构象限制条件包括Pro,Dtc(5,5-二甲基噻唑烷-4-羧酸),Aib,Cle,(NMe)Ala,(NMe)Ile和内酰胺修饰,L,L-内酰胺-Phe,先前由Freidinger等人描述。(J.Org.Chem.1982,47,104-109)。[Sar1,(NMe)Ala3和Pro3] ANG II均保留激动剂活性,而仅[Sar1,(NMe)Ala3,Ile8] ANGII保留拮抗剂活性。[Sar1,Dtc5] ANG II显示出优异的激动剂活性,而[Sar1,Dtc5和Cle5,Ile8] ANG