The microsomal fraction from tulip bulbs (Tulipa fosteriana L.) contains cytochrome P-450 enzymes catalyzing the NADPH-dependent oxidation of the xenobiotic substrate, an azo dye Sudan I (1-phenylazo-2-hydroxynaphthalene, Solvent Yellow 14). C-Hydroxy derivatives [1-(4-hydroxyphenylazo)-2-hydroxynaphthalene, 1-phenylazo-2,6-dihydroxynaphthalene, 1-(4-hydroxyphenylazo)-2,6-dihydroxynaphthalene] and the benzenediazonium ion are the products of the Sudan I oxidation. The oxidation of Sudan I has also been assessed in a reconstituted electron-transport chain with the isolated cytochrome P-450, isolated plant NADPH-cytochrome P-450 reductase and phospholipid. The results are discussed from the point of view of the role of cytochromes P-450 in the metabolism of xenobiotics in plants.
郁
金香鳞茎微粒体(
Tulipa fosteriana L.)中含有细胞色素P-450酶,可催化异
生物底物偶氮
染料苏丹I(1-苯基偶氮-2-羟基
萘,
溶剂黄14)的
NADPH依赖性氧化反应。
苏丹I氧化产生C-羟基衍
生物[1-(
4-羟基苯基偶氮)-2-羟基
萘、1-苯基偶氮-2,6-二羟基
萘、1-(
4-羟基苯基偶氮)-2,6-二羟基
萘]和苯重氮离子。在隔离的细胞色素P-450、隔离的植物
NADPH-细胞色素P-450还原酶和
磷脂的重构电子传递链中,也评估了
苏丹I的氧化反应。从细胞色素P-450在植物异
生物代谢中的作用角度讨论了结果。