Effects of Heterocyclic Aromatic Substituents on Binding Affinities at Two Distinct Sites of Somatostatin Receptors. Correlation with the Electrostatic Potential of the Substituents
作者:Vidya Prasad、Elizabeth T. Birzin、Cheryl T. McVaugh、Rachel D. van Rijn、Susan P. Rohrer、Gary Chicchi、Dennis J. Underwood、Edward R. Thornton、Amos B. Smith、Ralph Hirschmann
DOI:10.1021/jm0205088
日期:2003.5.1
that the replacement of benzene or indole side chains by heterocyclic aromatic rings typified by pyridine and pyrazine not only enhances water solubility and hydrogen bonding capacity as expected, but can also profoundly diminish the ability of the pi-cloud of the aromatic substituent to interact with side chains of an aromatic binding pocket such as that for Trp(8) of SRIF-14. Conversely, these calculations
在我们的持续计划中,研究生长抑素(SRIF-14)的基于葡萄糖的肽模拟物,我们试图改善糖苷的水溶性。这导致对SRIF受体上配体结合位点性质的见解。用吡啶基甲基或吡嗪-2-基甲基同源物代替葡糖苷(+)-2中的C4苄基取代基可增加水溶性,并增强对人SRIF亚型受体4(sst4)的亲和力。我们将此效应归因于氢键的形成。当与C2上的咪唑-4-基甲基结合时,C4上的吡啶-3-基甲基取代基生成(-)-19,这是迄今为止基于葡萄糖的拟肽对人SRIF受体的亲和力最高的(-)-19 (i)53 +/- 23 nM,在sst4时n = 6)。在异头碳上带有1-甲氧基取代基而不是吲哚侧链的葡糖苷的C4杂环同类物,也提供了有关Trp(8)结合口袋的信息。我们通过使用Spartan 3-21G(*)MO分析,将C4和Trp(8)结合口袋处的SAR与各种C4芳香族取代基的静电势计算相关联。这些计算提供了分子在受体结合