Enzymic O-methylation of isoliquiritigenin and licodione in alfalfa and licorice cultures
作者:Masuo Ichimura、Tetsuo Furuno、Takeyoshi Takahashi、Richard A. Dixon、Shin-Ichi Ayabe
DOI:10.1016/s0031-9422(96)00670-x
日期:1997.3
this study, cultured alfalfa cells were shown to exhibit rapid and transient increases in the extractable activities of both CHMT and LMT after treatment with yeast extract (YE). Treatment of solution-cultured alfalfa seedlings with YE also resulted in a similar induction of both CHMT and LMT activities in the roots, but no activity was detected in the shoots. These activities were attributed to a single
S-腺苷-L-甲硫氨酸(SAM):异甘草素(2',4,4'-三羟基查尔酮)苜蓿(Medicago sativa)的2'-O-甲基转移酶(CHMT)催化4,4'-二羟基-2的形成'-甲氧基查尔酮,它是根瘤菌根瘤基因最有效的诱导剂,苜蓿的共生体形成固氮根瘤。SAM:甘草二酮 2'-O-甲基转移酶 (LMT) 参与培养的甘草 (Glycyrrhiza echinata) 细胞中逆查尔酮的生物合成,并已被证明作为细胞的防御反应被诱导。因为 licodione 存在于互变异构 2',4,4',β-四羟基查尔酮(主要)和 1-(2,4-二羟基苯基)-3-(4-羟基苯基)-1,3-丙二酮(次要)的平衡混合物中,两种酶的表观作用方式非常相似。在这项研究中,在用酵母提取物 (YE) 处理后,培养的苜蓿细胞显示出 CHMT 和 LMT 的可提取活性的快速和瞬时增加。用 YE 处理溶液培养的苜蓿幼苗也导致根中 CHMT