Peptide Folding Induces High and Selective Affinity of a Linear and Small β-Peptide to the Human Somatostatin Receptor 4
作者:Karl Gademann、Thierry Kimmerlin、Daniel Hoyer、Dieter Seebach
DOI:10.1021/jm010816q
日期:2001.7.1
analysis, Figure 2) and there is high and specific nanomolar affinity for hsst(4) receptor (Table 1). In contrast, the isomer 2 bearing the Lys side chain in 3-, rather than in the 2-position, has a 1000-fold smaller affinity to hsst(4). The syntheses of the required Fmoc-protected beta-amino acids (8-11, 17) are described (Schemes 1-3). Coupling of the beta-amino acids was achieved by the manual solid-phase
已知相邻残基(具有(S)构型)的2和3位侧链的β肽会折叠并形成一个转角(类似于α肽β转角)。因此,我们合成了适当取代的β-四肽衍生物,以模拟生长激素抑制素与人类受体hsst(1-5)的结合,后者已知会在含有氨基酸残基Thr,Lys,Trp,和Phe。N-乙酰基肽酰胺Ac-beta(3)-HThr-beta(2)-HLys-beta(3)-HTrp-beta(3)-HPhe-NH(2)(1)确实显示了有针对性的拟态模拟:Lys CH(2)基团位于Trp吲哚环的屏蔽锥中(通过NMR分析,图2),并且对hsst(4)受体具有很高的纳摩尔亲和力(表1)。相比之下,带有Lys侧链的异构体2位于3-位,而不是位于2位,与hsst(4)的亲和力小1000倍。描述了所需的Fmoc保护的β-氨基酸(8-11、17)的合成(方案1-3)。β-氨基酸的偶联是通过手动固相技术在Rink树脂上完成的。