The 2-thiomodified nucleosides, located at first position of tRNAs anticodon, may constitute a primary target for oxidative attack under conditions of oxidative stress. Desulfuration of 2-thiouridine (S2U) was investigated in the 1H NMR scale in the presence of 100 mM H2O2 and phosphate buffer in the physiological pH range, from pH 6.6 to 7.6. The obtained data demonstrate an intriguing result that
位于tRNAs反密码子第一个位置的2-
硫代修饰核苷可能构成氧化应激条件下氧化攻击的主要靶标。在100 mM H 2 O 2和
磷酸盐缓冲液的存在下,在生理pH范围为6.6至7.6的范围内,以1 H NMR规模研究了2-
硫尿苷(S2U)的脱
硫。获得的数据证明了一个有趣的结果,在pH 7.6范围内,
尿苷是S2U脱
硫的主要产物,而4-
嘧啶酮核苷(H2U)在pH 6.6中占优势。在tRNA氧化损伤的背景下,讨论了可能的脱
硫途径以及将S2U转化为U或H2U的
生物学重要性。