作者:Kotomi Ueno、Hidetaka Yoneyama、Masaharu Mizutani、Nobuhiro Hirai、Yasushi Todoroki
DOI:10.1016/j.bmc.2007.06.010
日期:2007.9
ABA is the absence of the side-chain methyl group (C6) and lack of the alpha,beta-unsaturated carbonyl (C2'C3'-C4'O) in the six-membered ring. To explore which moiety is responsible for asymmetrical binding by CYP707A3, we synthesized and tested ABA analogues that lacked each moiety. Competitive inhibition was observed for the (1'R) enantiomers of these analogues in the potency order of (1'R,2'R)-(-)-2'
脱落酸(ABA)是一种植物胁迫激素,其分子中具有手性中心(C1'),在化学合成过程中产生对映异构体(1'S)-(+)-ABA和(1'R)-(-)-ABA 。ABA 8'-羟化酶(CYP707A)是植物ABA分解代谢中的主要和关键P450酶,催化天然存在的(1'S)-(+)-对映体,而不能识别天然不存在的(1'R)- (-)-对映体,可作为底物或抑制剂。在这里我们报告结构的ABA类似物(AHI1),尽管与ABA的立体结构相似,但其两个对映体均与重组拟南芥CYP707A3结合。AHI1与ABA的区别在于六元环中不存在侧链甲基(C6),也不存在α,β-不饱和羰基(C2'C3'-C4'O)。为了探索哪个部分负责通过CYP707A3进行不对称结合,我们合成并测试了缺少每个部分的ABA类似物。以(1'R,2'R)-(-)-2',3'-dihydro-4'-deoxo-ABA(K (I)= 0.45 m