作者:Fuchao Xu、Kandy Napan、Shuwei Zhang、Tyler Gladwin、Jon Takemoto、Jixun Zhan
DOI:10.1016/j.bmcl.2017.05.068
日期:2017.8
Pradimicins are a group of antiviral and antifungal natural products from Actinomadura hibisca. Two putative O-methyltransferase genes, pdmF and pdmT, are present in the pradimicin biosynthetic gene cluster. However, there is only one methoxy group (11-OCH3) in pradimicins. Through heterologous expression and in vitro reactions with various substrates, PdmF was characterized as the C-11 O-methyltransferase
Pradimicins是一组来自Actinomadura hibisca的抗病毒和抗真菌天然产物。pradimicin生物合成基因簇中存在两个推定的O-甲基转移酶基因pdmF和pdmT。然而,在radimicins中仅存在一个甲氧基(11-OCH 3)。通过异源表达和与各种底物的体外反应,PdmF被表征为具有相对广泛的底物特异性的C-11 O-甲基转移酶。为了探测PdmT在Pradimicin生物合成中的作用,相应的基因通过同源重组被破坏,从而导致Pradimicinone II的产生。然后,该酶在具有N端His 6标签的大肠杆菌,并通过Ni-NTA色谱法纯化。与PDMT pradimicinone II的反应中生成的7- ø -methylpradimicinone II,证实了这种酶是一个C-7 Ò -methyltransferase。PdmT的表征提示了一种新的途径,该途径可导致P