members of the purinemetabolicpathway in animals, plants, and microorganisms. However, further metabolism of AICA remains elusive. Based on these results and facts, we hypothesized that plants themselves produce AHX and AOH through a pathway similar to the chemical synthesis. Herein, we demonstrate the existence of endogenous AHX and AOH and a novelpurinepathway to produce them in plants.
2-Azahypoxanthine was isolated from the fairy ring-forming fungus Lepistasordida as a fairy ring-inducing compound. 2-Azahypoxanthine has an unprecedented 1,2,3-triazine moiety, and its biosynthetic pathway is unknown. The biosyntheticgenes for 2-azahypoxanthine formation in L. sordida were predicted by a differential gene expression analysis using MiSeq. The results revealed that several genes in
Fairy chemicals (FCs), 2-azahypoxanthine (AHX), imidazole-4-carboxamide (ICA), and 2-aza-8-oxohypoxanthine (AOH), are molecules with many diverse functions in plants. The defined biosynthetic pathway for FCs is a novelpurine metabolism in which they are biosynthesized from 5-aminoimidazole-4-carboxamide. Here, we show that one of the purine salvage enzymes, hypoxanthine-guanine phosphoribosyltransferase
Fairy chemicals (FCs)、2-azahypoxanthine (AHX)、imidazole-4-carboxamide (ICA) 和 2-aza-8-oxohypoxanthine (AOH) 是在植物中具有许多不同功能的分子。确定的 FC 生物合成途径是一种新型嘌呤代谢,其中它们由 5-氨基咪唑-4-甲酰胺生物合成。在这里,我们表明其中一种嘌呤补救酶次黄嘌呤-鸟嘌呤磷酸核糖基转移酶 (HGPRT) 将 AHX 和 AOH 识别为底物。酶促合成了两种新化合物AOH核糖核苷酸及其核糖核苷,它们是AOH的衍生物。通过质谱、一维和二维核磁共振光谱和 X 射线单晶衍射分析确定结构。该报告证明了 HGPRT 的功能以及与水稻中 FC 生物合成相关的新型嘌呤代谢的存在。