Importance of <i>peri</i>-Interactions on the Stereospecificity of Rat Hydroxysteroid Sulfotransferase STa with 1-Arylethanols
作者:Erden Banoglu、Michael W. Duffel
DOI:10.1021/tx980219f
日期:1999.3.1
with the enantiomers of 1-(2-naphthyl)ethanol and 1-acenaphthenol, the enzyme was stereospecific for (R)-(+)-1-(1-naphthyl)ethanol, (R)-(+)-1-(1-pyrenyl)ethanol, and (R)-(+)-1-(9-phenanthryl)ethanol as substrates. Moreover, (S)-(-)-1-(1-naphthyl)ethanol, (S)-(-)-1-(1-pyrenyl)ethanol, and (S)-(-)- 1-(9-phenanthryl)ethanol were competitive inhibitors of STa. Structural and conformational analyses of
羟基类固醇(醇)磺基转移酶催化含有苄基羟基官能团的多环芳烃(PAH)的硫酸化。该代谢反应通常是活化羟烷基取代的PAH形成亲电子代谢物的关键步骤,该亲电子代谢物能够在DNA,RNA和蛋白质的亲核位点形成共价键。由于羟烷基取代的PAH通常是通过烷基取代的PAH上苄基位置的立体选择性酶促羟基化代谢形成的,因此我们研究了羟烷基芳烃的硫酸化也是立体选择性的可能性。大鼠肝羟类固醇(醇)磺基转移酶STa的均质制剂用于研究其催化功能与模型1-芳基乙醇的对映异构体的立体选择性。尽管仅观察到最小的立体选择性,即STa与1-(2-萘基)乙醇和1-ac烯醇的对映异构体的催化效率,但该酶对(R)-(+)-1-(1-萘基)乙醇具有立体特异性,(R)-(+)-1-(1-吡啶基)乙醇和(R)-(+)-1-(9-菲基)乙醇为底物。另外,(S)-(-)-1-(1-萘基)乙醇,(S)-(-)-1-(1-吡啶基)乙醇和(S)-(