三个新的二酮哌嗪(1 - 3),环(升-Pro- d -反式-Hyp)(1),环(升-Pro- d -Glu)(2),和环(d -Pro- d -Glu) (3)和5种已知的二酮哌嗪(4 - 8)从endolichenic真菌分离Colpoma藻。从哥斯达黎加植物Henriettea tuberculosa(Melatomataceae)鉴定出的CR1465A。新化合物的结构1 - 3使用广泛的光谱分析(包括2D NMR和HR-MS)进行了阐明,并通过结合NOESY分析和Marfey方法确定了它们的绝对构型。环(升-Pro- d -异基因-苏)(4)最近从中国南海海绵隔离Callyspongia。SP,但它的NMR光谱数据未报告和环(升-Pro-升-Asp)(5)以前曾报道过,但仅作为合成产品。化合物4和5的NMR数据分配是第一次报告。测试所有分离出的化合物的抗真菌和抗菌性能。
A comparative study of antimicrobial properties of cyclo(l-Pro- l-Asp) with its 2-ketopiperazine analog
摘要:
Cyclo(l-Pro- l-Asp) diketopiperazine was synthesized and its antimicrobial properties were compared against its 2-ketopiperazine analog. The results indicate the significance of the peptide bond in antimicrobial property of cyclo(l-Pro- l-Asp) against various pathogenic bacteria and fungi with potent inhibitory effect over the 2-ketopiperazine analog. Cyclo(l-Pro- l-Asp) exhibited a higher inhibitory activity against Penicillium expansum (MIC 8 mu g/mL) than the standard fungicide amphotericin B (MIC 64 mu g/mL). The most potent activity by cyclo(l-Pro- l-Asp) was exhibited against Trichophyton rubrum (MIC 2 mu g/mL).