2,4-Diamino-5-substituted-quinazolines as Inhibitors of a Human Dihydrofolate Reductase with a Site-Directed Mutation at Position 22 and of the Dihydrofolate Reductases from Pneumocystis carinii and Toxoplasma gondii
作者:Andre Rosowsky、Clara E. Mota、Sherry F. Queener、Mark Waltham、Emine Ercikan-Abali、Joseph R. Bertino
DOI:10.1021/jm00005a002
日期:1995.3
than native enzyme to the classical antifolate methotrexate (MTX), yet shows minimal cross resistance to the nonclassical antifolates piritrexim (PTX) and trimetrexate (TMQ). Although they were much less potent than trimetrexate and piritrexim, the lipophilic 5-substituted analogues were all found to bind approximately 10 times better to the mutant DHFR than to the wild-type enzyme. The potency of the
合成了在5位具有亲脂性侧链的2,4-二氨基喹唑啉抗叶酸剂,在一种情况下具有经典的(对氨基苯甲酰基)-L-谷氨酸侧链的叶酸,可作为人类定点突变体的潜在选择性抑制剂在位置22含有苯丙氨酸而不是亮氨酸的二氢叶酸还原酶(DHFR)。该突变酶对天然抗叶酸甲氨蝶呤(MTX)的抵抗力比天然酶高约100倍,但对非经典抗叶酸派瑞特肟(PTX)和曲美曲塞(TMQ)。尽管它们的功效不如曲美曲塞和匹利特辛,但亲脂性5取代的类似物与突变型DHFR的结合力均比野生型酶高约10倍。与MTX相比,具有经典(对氨基苯甲酰基)-L-谷氨酸侧链的类似物的效力类似地降低,但是其与两种DHFR物质的结合亲和力的差异仅为5倍。因此,通过在抗叶酸分子中进行细微的结构改变,由于靶酶活性位点的突变改变,有可能攻击抗性。同样,为了检验假说卡氏肺孢子虫和弓形虫的DHFR可能比来自哺乳动物细胞的酶具有更少的空间限制性活性位点,使用了该系列中的几