Nine Constituents Including Six Xanthone-Related Compounds Isolated from Two Ascomycetes, Gelasinospora santi-florii and Emericella quadrilineata, Found in a Screening Study Focused on Immunomodulatory Activity
作者:Haruhiro Fujimoto、Takeshi Asai、Yong-Pil Kim、Masami Ishibashi
DOI:10.1248/cpb.54.550
日期:——
Five metabolites tentatively called GS-1 (1)—5 (5) from Gelasinospora santi-florii, and four tentatively called EQ-4 (6), EQ-6 (7)—8 (9) together with 1—4 from Emericella quadrilineata have been isolated in a screening study on immunomodulatory fungal constituents. Among these nine metabolites, EQ-7 and 8 have been unknown. This time, the structures of GS-4 which has previously been isolated, EQ-7, and -8 have been determined to be (4R,4aS,9aR)-1,9a-dihydronidulalin A (4), (4S,4aR,9aR)-4a-carbomethoxy-1,4,4a,9a-tetrahydro-4,8-dihydroxy-6-methylxanthone (8), and 9-hydroxymicroperfuranone (9), respectively, and the six other metabolites have been identified. On bioassay, a dihydroxanthone, nidulalin A (1), a hexaketide, sordarial (5), and a xanthone, pinselin (7) have displayed significant immunosuppressive activities. The structure–activity relationships of these constituents have also been discussed.
在一项关于免疫调节真菌成分的筛选研究中,从 Gelasinospora santi-florii 中分离出了五种暂称为 GS-1 (1)-5 (5) 的代谢物,从 Emericella quadrilineata 中分离出了四种暂称为 EQ-4 (6)、EQ-6 (7)-8 (9) 和 1-4 的代谢物。在这九种代谢物中,EQ-7 和 8 一直不为人知。这一次,先前分离出的 GS-4、EQ-7 和 -8 的结构已被确定为 (4R,4aS,9aR)-1,9a-二氢花粉苷 A (4)、(4S,4aR、9aR)-4a-甲氧羰基-1,4,4a,9a-四氢-4,8-二羟基-6-甲基黄酮(8)和 9-羟基微呋喃酮(9)。在生物测定中,二羟基黄酮尼杜拉林 A(1)、六内酯索尔达里(5)和黄酮蒎烯(7)显示出显著的免疫抑制活性。此外,还讨论了这些成分的结构-活性关系。