Ionizing radiation triggers the activation of caged oligodeoxynucleotides (ODNs) with a 2-oxoalkyl leaving group to give the corresponding normal uncaged strands. We designed and synthesized ODNs caged by a 2-oxopropyl group at a given thymine N(3) position (doxoT) to evaluate their one-electron reduction characteristics. Upon hypoxic X-radiolysis in aqueous solution, the caged ODNs released the 2-oxopropyl group to produce the corresponding uncaged ODNs. Digestion by a restriction enzyme Swa I revealed that caged ODN pre-irradiated in hypoxia could form an ordinary duplex with its complementary strand.
电离辐射触发带有 2-氧代烷基离去基团的笼状寡脱氧核苷酸 (ODN) 的激活,产生相应的正常未笼状链。我们设计并合成了在给定胸腺
嘧啶 N(3) 位 (doxoT) 处被 2-氧代丙基笼住的 ODN,以评估其单电子还原特性。在
水溶液中进行缺氧 X 射线解时,笼状 ODN 释放 2-氧代丙基,产生相应的非笼状 ODN。限制性内切酶Swa I的消化表明,在缺氧条件下预照射的笼养ODN可以与其互补链形成普通双链体。