Ogata Jun, Kanno Yoshiaki, Itoh Yoshio, Tsugawa Hidehito, Suzuki Masahiko
Aomori Green BioCenter, Nogi-Yamaguchi, Aomori 030-0142, Japan.
Nature. 2005 Jun 9;435(7043):757-8. doi: 10.1038/nature435757a.
Anthocyanin is the principal pigment in flowers, conferring intense red-to-blue cyanic colours on petals and helping to attract pollinators. Its biosynthesis involves glycosylation steps that are important for the stability of the pigment and for its aqueous solubility in vacuoles. Here we describe anthocyanin biosynthesis in roses (Rosa hybrida), which is unlike the pathway used in other flowers in that it relies on a single enzyme to achieve glycosylation at two different positions on the precursor molecule. Phylogenetic analysis also indicates that this previously unknown glucosyltransferase enzyme may be unique to roses, with glycosylation having apparently evolved into a single stabilizing step in other plants.
花青素是花朵中的主要色素，赋予花瓣强烈的红到蓝的颜色，有助于吸引传粉者。其生物合成涉及糖基化步骤，这些步骤对于色素的稳定性及其在液泡中的水溶性很重要。在这里，我们描述了玫瑰（Rosa hybrida）中的花青素生物合成，它与其他花朵中使用的途径不同，因为它依赖于一种单一的酶在前体分子的两个不同位置实现糖基化。系统发育分析还表明，这种以前未知的葡萄糖基转移酶可能是玫瑰特有的，在其他植物中，糖基化显然已经演变成一个单一的稳定步骤。
