Five partial structures, 3-7, of FK-156 (1), an immunostimulating acyl peptide, have been prepared. The compounds were evaluated for biological activities, and it was found that N2-(γ-D-glutamyl)-2 (L), 2' (D)-diaminopimelic acid (3) represents the minimal active structure unit essential for the immunostimulating property of FK-156 (1). Its caprylyl derivative 8 and stearoyl derivative 9 were found to be capable of increasing resistance to bacterial infection as efficiently as 1. Moreover, compound 9 showed a potent tumor-suppressive activity lacking in 1.
制备了免疫刺激酰基肽 FK-156 (1) 的五个部分结构(3-7)。对这些化合物的
生物活性进行了评估,发现 N2-(γ-D-谷
氨酰)-2(L),2'(D)-二
氨基亚
庚酸(3)是 FK-156 (1) 免疫刺激特性所必需的最小活性结构单元。研究发现,它的
辛烯丙基衍
生物 8 和硬脂酰衍
生物 9 与 1 一样能够有效增强对细菌感染的抵抗力。