TDP-d-desosamine. DesII also catalyzes the dehydrogenation of the nonphysiological substrate TDP-D-quinovose to TDP-3-keto-6-deoxy-d-glucose. These properties prompted an investigation of how DesII handles SAM in the redox neutral deamination versus the oxidative dehydrogenation reactions. This work was facilitated by the development of an enzymatic synthesis of TDP-4-amino-4,6-dideoxy-d-glucose that
来自 Streptomyces venezuelae 的 DesII 是一种自由基 S
AM(S-
腺苷-l-甲
硫氨酸)酶,可催化 TDP-4-
AMino-4,6-dideoxy-d-
葡萄糖脱
氨基形成 TDP-3-keto-4,6-双脱氧-d-
葡萄糖在TDP-d-脱糖胺的
生物合成中的作用。DesII 还催化非生理底物 TDP-D-quinovose 脱氢为 TDP-3-keto-6-deoxy-d-glucose。这些特性促使我们研究 DesII 如何在氧化还原中性脱
氨反应与氧化脱氢反应中处理 S
AM。TDP-4-
AMino-4,6-dideoxy-d-
葡萄糖的酶促合成的发展促进了这项工作,该酶将转
氨平衡与
甲酸的热力学有利氧化相结合。在这项研究中,发现 DesII 消耗 S
AM 与 TDP 糖的
化学计量为 0.96 +/- 0.05 和 1.01 +/- 0。05 分别用于脱
氨基和脱氢反应,使用