Ring-methyl hydroxylation of chlortoluron by an inducible cytochrome P450-dependent enzyme from maize
作者:Raymonde Fonné-Pfister、Klaus Kreuz
DOI:10.1016/0031-9422(90)87077-8
日期:1990.1
Abstract An enzyme catalysing ring-methyl hydroxylation of the substituted phenylurea herbicide chlortoluron was detected in isolated microsomes from germinating maize. Chlortoluron hydroxylation was absolutely dependent on NADPH and molecular oxygen. The enzyme was inhibited by carbon monoxide in the presence of oxygen and this inhibition could be reversed by light. Several known inhibitors of cytochrome
摘要 在来自发芽玉米的分离微粒体中检测到一种酶催化取代苯脲类除草剂氯吡脲的环甲基羟基化。氯脲羟基化完全依赖于 NADPH 和分子氧。该酶在氧气存在下被一氧化碳抑制,这种抑制作用可以被光逆转。几种已知的细胞色素 P450 酶抑制剂可不同程度地抑制氯酮羟基化。结论是新检测到的酶是细胞色素P450依赖性混合功能氧化酶。通过用除草剂解毒剂 CGA 154281 [4-(二氯乙酰)-3,4-二氢-3-甲基-2H-1,4-苯并恶嗪]处理玉米种子,酶活性提高了 15 倍。