Seven heptapeptide derivatives have been prepared. The peptide structure is (Gly)3Xxx(Gly)3 in which Xxx stands for a variable amino acid. The amino acid variations include azetidine carboxylic acid, pipecolic acid, meta-aminobenzoic acid, proline, and leucine. All seven compounds have a C-terminal benzyl group. In all cases, the heptapeptide’s N-terminus was linked to diglycolic acid and a dialkylamine. In five cases, the N-terminal group was didecylamine and in two cases, N-ethyl-N-decyl. Chloride and carboxyfluorescein release from phospholipid vesicles was studied with the result that C10H21N(C2H5)COCH2OCH2CO–NH–(Gly)3Leu(Gly)3–OCH2Ph was the most active. Hill analysis showed that this compound involves pore formation by four monomer units rather than two, as previously found for other members of this family.
制备了七种七肽衍
生物,其肽结构为(Gly)3Xxx(Gly)3,其中Xxx代表一种可变
氨基酸。
氨基酸变体包括吖丁啶
羧酸、
哌啶酸、
间氨基苯甲酸、脯
氨酸和亮
氨酸。所有七种化合物均具有C端苄基。在所有情况下,七肽的N端与
二甘醇酸和二烷基胺相连。在五种情况下,N端基团为
二癸胺,在两种情况下为N-乙基-N-癸基。研究了
氯离子和羧基
荧光素从
磷脂囊泡中的释放情况,结果显示
C10H21N(
C2H5)COCH2OCH2CO–NH–(Gly)3Leu(Gly)3–OCH2Ph最为活性。希尔分析显示,该化合物涉及由四个单体单元形成的孔隙,而不是两个,这与本家族其他成员先前的发现不同。