The Hydrogen Bond Mimic Approach: Solid-Phase Synthesis of a Peptide Stabilized as an α-Helix with a Hydrazone Link
作者:Edelmira Cabezas、Arnold C. Satterthwait
DOI:10.1021/ja983212t
日期:1999.4.1
extensive hydrogen bonding that defines regular and irregular substructures. However, hydrogen bonds are weak and insufficient for stabilizing peptide conformation in water. Consequently, the biological activity of peptides is reduced. This led us to test whether a covalent mimic of the hydrogen bond could be used to stabilize peptide conformation in water. A solid-phase synthesis is described for replacing
蛋白质的特征是广泛的氢键,它定义了规则和不规则的子结构。然而,氢键很弱,不足以稳定水中的肽构象。因此,肽的生物活性降低。这使我们测试了氢键的共价模拟物是否可用于稳定水中的肽构象。描述了用肽中的腙链接 (N-NCH-CH2CH2) 代替主链氢键 (NH → OCRNH) 的固相合成。该合成易于实施、快速且能够获得高产率。在乙酰基-GLAGAEAAKA-NH2 (1) 的 N 末端用腙取代推定的 (i + 4 → i) 氢键,得到 [JLAZ]AEAAKA-NH2 (2) 将其转化为全长 α-如核磁共振光谱所示,在环境温度下在水中呈螺旋状。对跨度为 2 的弱 dαN(i, i + 3)、中等 dNN(i, i + 1) 和强 dαβ(i, i + 3) NOE 的观察确定了水中全长 α 螺旋的形成. 杰...