Absolute configuration of 6-methyl-5,6,7,8-tetrahydropterin produced by enzymic reduction (dihydrofolate reductase and NADPH) of 6-methyl-7,8-dihydropterin
作者:Wilfred L. F. Armarego、Paul Waring、Jeffrey W. Williams
DOI:10.1039/c39800000334
日期:——
Dihydrofolate reductase (5,6,7,8-tetrahydrofolate: NADP oxidoreductase, E.C.1.5.1.3.) and NADPH, which catalyse the reduction of 7,8-dihydrofolic acid (1) stereospecifically to give one diastereoisomer of 5,6,7,8-tetrahydrofolic acid (3), also catalyse the reduction of 6-methyl-7,8-dihydropterin (2) stereospecifically to (-)-6-methyl-5,6,7,8-tetrahydropterin (4); the absolute configuration at C-6 of
二氢叶酸还原酶(5,6,7,8-四氢叶酸:NADP氧化还原酶,EC1.5.1.3。)和NADPH,它们可催化立体定向地还原7,8-二氢叶酸(1),得到一种5,6,7的非对映异构体, 7,8-四氢叶酸(3)还催化6-甲基-7,8-二氢蝶呤(2)立体定向还原为(-)-6-甲基-5,6,7,8-四氢蝶呤(4);在蝶呤(的C-6的绝对构4)被示出为小号通过与相关小号-丙氨酸使用一系列甲基化,降解和合成,并且如果最可能的假设是这两个反应的立体特异性相同,则酶产生的C-6的绝对构型为5,6,7,8 -四氢叶酸应该是小号。