Regioselective Hydroxylation of C<sub>12</sub>-C<sub>15</sub>Fatty Acids with Fluorinated Substituents by Cytochrome P450 BM3
作者:Chih-Hsiang Chiang、Ravirala Ramu、Yi-Jung Tu、Chung-Ling Yang、Kok Yaoh Ng、Wen-I Luo、Charles H. Chen、Yu-Ying Lu、Chen-Lun Liu、Steve S.-F. Yu
DOI:10.1002/chem.201302402
日期:2013.10.4
control of the regioselectivity by the fluorinated terminal methyl groups of the C12–C15 fatty acids has been noted. Despite the fact that residues Arg47/Tyr51/Ser72 exert significant control over the hydroxylation of the subterminal carbon atoms toward the hydrocarbon tail, the fluorine substituent(s) at the ω‐position affects the regioselective hydroxylation. For substrate hydroxylation, we have found
我们在这里证明野生型细胞色素P450 BM3可以识别非天然底物,例如氟化的C 12 –C 15链长脂肪酸,并对它们的有效转化表现出更好的催化作用。尽管P450 BM3袋中氟化底物的结合亲和力略低于非氟化底物的结合亲和力,但自旋位移测量表明ω位的氟取代基可促进内部重整水网络动态结构的重排。通过微去溶剂化过程将疏水囊袋排出,以排出处于静止状态的血红素铁的水配体。Michaelis-Menten常数(K m),但表明与非氟代脂肪酸相比,氟代脂肪酸确实是更好的底物。周转频率(的增强ķ猫),用于从NADPH电子转移到血红素铁和对C 由化合物I(CPD I),得到产物H键氧化表明,与来自酶-底物去相关联的活化能在氟化基板的情况下,对于两个步骤,从(ES状态)到相应的过渡状态(ES ≠状态)的活性均显着降低。通过C 12 –C 15的氟化末端甲基精确控制区域选择性已经注意到脂肪酸。尽管残基Arg47 /