demonstrate the acceptance of a number of hydroxyxanthones by AstPT in the presence of not only dimethylallyl but also geranyl and farnesyl diphosphate. Structural elucidation by HR-MS and NMR analyses proved the O-prenylation of all thirteen isolated enzyme products with different prenyl moieties. These results demonstrated the remarkable substrate and catalytic promiscuity of AstPT, which was recognised
烯丙基化的
氧杂蒽酮是具有广泛
生物活性(包括抗微
生物和抗肿瘤活性)的次生代谢产物。在nidulans中已鉴定出一种
蒽酮O-
异戊二烯基转移酶X
PTB 。最近,我们表征了来自曲霉菌的双
吲哚基苯醌C-和N-异
戊烯基转移酶Ast
PT,对
异戊二烯基供体二
磷酸二烯丙基烯丙基和受体双
吲哚基苯醌均具有异常高的底物特异性。在这项研究中,我们证明了在不仅存在二甲基烯丙基,还存在香叶基和法呢基
二磷酸酯的情况下,Ast
PT接受了许多羟基
黄嘌呤。通过HR-MS和NMR分析对结构进行了阐明,证明了具有不同
异戊二烯基部分的所有十三种分离的酶产物的O-异
戊烯基化。这些结果表明,Ast
PT具有显着的底物和催化混杂性,在这项研究之前,Ast
PT被认为是一种特定的酶。