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首页> 外文期刊>Journal of Medicinal Chemistry >Novel sst(2)-selective somatostatin agonists. Three-dimensional consensus structure by NMR
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Novel sst(2)-selective somatostatin agonists. Three-dimensional consensus structure by NMR

机译:新型sst(2)-选择性生长抑素激动剂。 NMR的三维共有结构

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摘要

The 3D NMR structures of six octapeptide agonist analogues of somatostatin (SRIF) in the free form are described. These analogues, with the basic sequence H-DPhe/Phe(2)-c[Cys(3)-Xxx(7)-DTrp(8)-Lys(9)-Thr(10)-Cys(14)]-Thr-NH2 (the numbering refers to the position in native SRIF), with Xxx(7) being Ala/Aph, exhibit potent and highly selective binding to human SRIF type 2 (sst(2)) receptors. The backbone of these sst(2)-selective analogues have the usual type-II', beta-turn reported in the literature for sst(2/3/5)-subtype-selective analogues. Correlating the biological results and NMR studies led to the identification of the side chains of DPhe(2), DTrp(8), and Lys(9) as the necessary components of the sst(2) pharmacophore. This is the first study to show that the aromatic ring at position 7 (Phe(7)) is not critical for sst(2) binding and that it plays an important role in sst(3) and sst(5) binding. This pharmacophore is, therefore, different from that proposed by others for sst(2/3/5) analogues.
机译:描述了游离形式的生长抑素(SRIF)的六个八肽激动剂类似物的3D NMR结构。这些类似物,基本序列为H-DPhe / Phe(2)-c [Cys(3)-Xxx(7)-DTrp(8)-Lys(9)-Thr(10)-Cys(14)]-Thr -NH2(编号是指天然SRIF中的位置),其中Xxx(7)为Ala / Aph,表现出与人SRIF 2型(sst(2))受体的强效和高度选择性结合。这些sst(2)-选择性类似物的骨架具有sst(2/3/5)-亚型选择性类似物的文献报道的通常的II型,β-转角。相关的生物学结果和NMR研究导致DPhe(2),DTrp(8)和Lys(9)的侧链鉴定为sst(2)药效团的必要组成部分。这是第一个表明7位芳香环(Phe(7))对sst(2)的结合不是至关重要的并且它在sst(3)和sst(5)的结合中起着重要作用。因此,该药效团不同于其他人提出的sst(2/3/5)类似物。

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