Oxidation of C18 Hydroxy-Polyunsaturated Fatty Acids to Epoxide or Ketone by Catalase-Related Hemoproteins Activated with Iodosylbenzene
作者:Tarvi Teder、William E. Boeglin、Alan R. Brash
DOI:10.1007/s11745-017-4271-0
日期:2017.7
and 9,10‐epoxy‐13‐keto derivatives; equivalent transformations occurred with 9S‐hydroxy‐linoleic acid as substrate. In parallel incubations in the presence of iodosylbenzene, human catalase displayed no activity towards 13S‐hydroxy‐linoleic acid, as expected from the highly restricted access to its active site. The results indicated that with suitable transformation to Compound I, monooxygenase activity
当使用碘基苯激活时,检查了与过氧化氢酶相关的小型过氧化氢酶相关的血蛋白,它们可以与脂肪酸氢过氧化物反应,以检测其潜在的单加氧酶活性。测试的蛋白为镰刀镰刀菌41 kD过氧化氢酶血红蛋白(Fg-cat,基因FGSG_02217),荧光假单胞菌Pfl01过氧化氢酶(37.5 kD,保藏号WP_011333788.1)和鸟分枝杆菌ssp。副结核病33 kD过氧化氢酶(基因MAP-2744c)。选择13-羟基-十八碳烯酸(通常不反应)作为底物,因为这些酶会与相应的13 S-氢过氧化物特异性反应(Pakhomova等人18:2559-2568,5; Teder等人。1862:706–715,14)。在亚碘酰苯FG-猫的存在下转化13 š羟基脂肪酸两种产品:13 15,16-双键š羟基α亚麻酸被立体特异性地氧化为15小号,16 - [R -顺-epoxide或13-羟基被氧化为13-酮。通过UV,HPL