代谢
乳糖代谢的主要途径被称为Leloir途径,以Luis Federico Leloir的名字命名。这个途径的第一阶段是通过酶乳糖变旋酶(GALM)将β-D-乳糖转化为α-D-乳糖。然后,途径通过三种主要酶及其反应将α-D-乳糖转化为UDP-葡萄糖:乳糖激酶(GALK)将α-D-乳糖磷酸化为乳糖-1-磷酸(Gal-1-P);乳糖-1-磷酸尿苷转移酶(GALT)将UDP-葡萄糖的一个UMP基团转移到Gal-1-P以形成UDP-乳糖;最后,UDP乳糖-4-表异构酶(GALE)相互转化UDP-乳糖和UDP-葡萄糖,完成途径。
The primary pathway for galactose metabolism is called the Leloir pathway, so named after Luis Federico Leloir. The initial stage of this pathway is the conversion of beta-D-galactose to alpha-D-galactose by the enzyme galactose mutarotase (GALM). The pathway then performs the conversion of alpha-D-galactose to UDP-glucose by way of three principal enzymes and their reactions: galactokinase (GALK) phosphorylates alpha-D-galactose to galactose-1-phosphate (Gal-1-P); galactose-1-phosphate uridyltransferase (GALT) transfers a UMP group from UDP-glucose to Gal-1-P to form UDP-galactose; and finally, UDP galactose-4-epimerase (GALE) interconverts UDP-galactose and UDP-glucose, which completes the pathway.
来源:DrugBank