Molecular cloning and characterization of (+)-epi-α-bisabolol synthase, catalyzing the first step in the biosynthesis of the natural sweetener, hernandulcin, in Lippia dulcis
作者:Mohamed Attia、Soo-Un Kim、Dae-Kyun Ro
DOI:10.1016/j.abb.2012.07.010
日期:2012.11
potential. However, the biosynthesis of hernandulcin in L. dulcis remains unknown. The first biochemical step of hernandulcin is the synthesis of (+)-epi-α-bisabolol from farnesyl diphosphate, which is presumed to be catalyzed by a unique sesquiterpene synthase in L. dulcis. In order to decipher hernandulcin biosynthesis, deep transcript sequencings (454 and Illumina) were performed, which facilitated the
Hernandulcin是一种C15倍半萜烯酮,是从Lippia dulcis的叶子中分离出来的天然甜味剂。由于其安全性和低热量潜力,它是一种有前途的糖替代品。但是,尚不清楚L. dulcis中hernandulcin的生物合成。Hernandulcin的第一步生化步骤是由法呢基二磷酸酯合成(+)-epi-α-bisabolol,据推测是由唯一的倍半萜中的倍半萜烯合酶催化的。为了破译hernandulcin的生物合成,进行了深转录本测序(454和Illumina),这有助于从L. dulcis克隆五个新的倍半萜烯合酶cDNA。在酵母中对这些cDNA的体内活性评估确定它们为α-copaene/δ-cadinene,双环大金花烯,β-石竹烯,反式-α-佛手柑和α-bisabolol的倍半萜烯合酶。在摇瓶培养中,工程酵母可以合成大量(〜0.3 mg / mL)的α-bisabolol。这种有效的