Synthesis and study of a cyclic angiotensin II antagonist analogue reveals the role of π*–π* interactions in the C-terminal aromatic residue for agonist activity and its structure resemblance with AT1 non-peptide antagonists
作者:Ludmila Polevaya、Thomas Mavromoustakos、Panagiotis Zoumboulakis、Simona Golic Grdadolnik、Panagiota Roumelioti、Nektarios Giatas、Ilze Mutule、Tatjana Keivish、Demetrios V Vlahakos、Efstathios K Iliodromitis、Dimitrios Th Kremastinos、John Matsoukas
DOI:10.1016/s0968-0896(01)00059-1
日期:2001.6
clustering between the side chains of the key aminoacids Tyr(4)-His(6)-Ile(8) similar to that observed with ANG II. The obtained data show that only pi*--pi* interactions observed in ANG II or its superagonist Sar(1) [ANG II] are missing. Therefore, it can be concluded that these interactions are essential for agonist activity. Conformational analysis comparisons between AT(1) antagonists losartan, eprosartan
已设计,合成了新型酰胺连接的血管紧张素II(ANG II)环状类似物环(3,5)-[Sar(1)-Lys(3)-Glu(5)-Ile(8)]并在麻醉兔子中进行生物测定。通过使用最大保护策略的溶液方法合成具有内酰胺酰胺桥的受约束的环状类似物,所述内酰胺酰胺桥在3和5位连接Lys-Glu对并且在8位具有Ile。发现该类似物是血管紧张素II的抑制剂。NMR光谱结合计算分析表明,关键氨基酸Tyr(4)-His(6)-Ile(8)的侧链之间聚集,类似于ANG II。获得的数据表明,仅缺少在ANG II或其超激动剂Sar(1)[ANG II]中观察到的pi *-pi *相互作用。因此,可以得出结论,这些相互作用对于激动剂活性是必不可少的。