Conformational preference for the binding of biaryl substrates and inhibitors to the active site of phenylethanolamine N-methyltransferase (PNMT)
作者:Gary L. Grunewald、Anne E. Carter、Daniel J. Sall、James A. Monn
DOI:10.1021/jm00396a010
日期:1988.1
previously described regions of steric bulk tolerance in the aromatic-ring binding site of phenylethanolamine N-methyltransferase (PNMT, EC 2.1.1.28) for phenylethanolamine substrates and alpha-methylbenzylamine inhibitors. For bound substrates, this region is located in the vicinity of the para position of the aromatic ring, while for bound alpha-methylbenzylamine inhibitors, it is located in the region
先前我们已经描述了苯乙醇胺N-甲基转移酶(PNMT,EC 2.1.1.28)的苯乙醇胺底物和α-甲基苄基胺抑制剂的芳香环结合位点的空间体积容限区域。对于结合的底物,该区域位于芳环对位的附近,而对于结合的α-甲基苄胺抑制剂,其位于与间位互补的区域。在本研究中,我们试图确定(间苯苯基)-和(对苯苯基)乙醇胺(分别为4和5)以及联苯和对苯苯基的联芳基部分的优选构象α-甲基苄胺(分别为7和8)用于PNMT活性位点相互作用。4、5、7的平面导数 通过合成2-(1-芴基)-2-羟乙胺(9),2-(2-芴基)-2-羟乙胺(10),1-(1-芴基)乙胺(11)得到8和8。和1-(2-芴基)乙胺(12)。检查了四种芴衍生物作为PNMT催化反应的底物和抑制剂的体外活性。与4、5、7和8的情况一样,我们已经观察到相对于9-12中存在的联苯骨架,烷基胺侧链的位置偏爱。因此,芴基乙醇胺10(“对联苯”)显示出米氏常数(Km