Carbamates with Differential Mechanism of Inhibition Toward Acetylcholinesterase and Butyrylcholinesterase
作者:Sultan Darvesh、Katherine V. Darvesh、Robert S. McDonald、Diane Mataija、Ryan Walsh、Sam Mothana、Oksana Lockridge、Earl Martin
DOI:10.1021/jm8002075
日期:2008.7.1
Most carbamates are pseudoirreversible inhibitors of cholinesterases. Phenothiazine carbamates exhibit this inhibition of acetylcholinesterase but produce reversible inhibition of butyrylcholinesterase, suggesting that they do not form a covalent bond with the catalytic serine. This atypical inhibition is attributable to pi-pi interaction of the phenothiazine moiety with F329 and Y332 in butyrylcholinesterase
大多数氨基甲酸酯是胆碱酯酶的假不可逆抑制剂。吩噻嗪氨基甲酸酯显示出对乙酰胆碱酯酶的这种抑制作用,但产生了对丁酰胆碱酯酶的可逆抑制作用,表明它们未与催化丝氨酸形成共价键。这种非典型的抑制作用归因于吩噻嗪部分与丁酰胆碱酯酶中的F329和Y332进行pi-pi相互作用。这些残基在一个螺旋段中,此处称为E-螺旋,因为它包含催化三联体的E325。使用该酶在A328,F329或Y332处的突变体可证实典型的拟不可逆抑制作用,从而证实了E-螺旋参与了吩噻嗪氨基甲酸酯对丁酰胆碱酯酶的可逆抑制。因此,除了丁酰胆碱酯酶活性位点的各个结构域之外,