<i>FaQR</i>, Required for the Biosynthesis of the Strawberry Flavor Compound 4-Hydroxy-2,5-Dimethyl-3(2H)-Furanone, Encodes an Enone Oxidoreductase
作者:Thomas Raab、Juan Antonio López-Ráez、Dorothée Klein、Jose Luis Caballero、Enriqueta Moyano、Wilfried Schwab、Juan Muñoz-Blanco
DOI:10.1105/tpc.105.039784
日期:2006.4
The flavor of strawberry (Fragaria x ananassa) fruit is dominated by an uncommon group of aroma compounds with a 2,5-dimethyl-3(H)-furanone structure. We report the characterization of an enzyme involved in the biosynthesis of 4-hydroxy-2,5-dimethyl-3(2H)-furanone (HDMF; Furaneol), the key flavor compound in strawberries. Protein extracts were partially purified, and the observed distribution of enzymatic
草莓(Fragaria x ananassa)水果的风味主要由具有2,5-二甲基-3(H)-呋喃酮结构的不常见的芳香化合物组成。我们报告了参与4-羟基-2,5-二甲基-3(2H)-呋喃酮(HDMF;呋喃酚),草莓中的关键风味化合物的生物合成酶的表征。蛋白提取物被部分纯化,观察到的酶活性分布与大约37 kD的单个多肽的存在有关。对两个肽片段的序列分析表明,它们与强烈成熟诱导的生长素依赖性推定醌氧化还原酶Fragaria x ananassa醌氧化还原酶(FaQR)的蛋白质序列完全相同。FaQR cDNA的开放阅读框由969 bp组成,编码322个氨基酸的蛋白质,计算的分子量为34.3 kD。激光捕获显微切割,然后进行RNA提取和扩增,证明草莓果实薄壁组织中FaQR mRNA的存在。FaQR蛋白在大肠杆菌中功能性表达,该单体催化HDMF的形成。经过化学合成和液相色谱-串联质谱分析,证实4-羟基