Development of the selective capture molecule for 8-nitroguanosine

在这项研究中，我们设计了新的含巯基的识别分子的共价捕获的8-硝基鸟苷的Gclamp骨架的基础上，通过引入不同长度的硫代烷基脲接头单元（nitroG-grasp）。具有C3接头的硝基G-抓取化合物即使在低浓度下也表现出最有效的鸟苷化，支持选择性复合物形成以实现对8-硝基-G的有效反应性。将cyclen单元连接到G-夹分子上以识别8-oxoGTP，作为cyclen-nitroG-grasp分子的模型化合物。环戊二烯-oxoG-钳的Zn-复合物能够在水性介质中区分8-oxoGTP与GTP。同时，将cyclen单元引入到nitroG-grass分子中，其表现出对8-nitroGMP的鸟苷酰化反应，而不与锌离子形成络合物。总之，本研究为共价捕获8-nitroGTP和8-nitroGMP奠定了分子基础。

In this study, we designed new thiol-containing recognition molecules for the covalent capture of 8-nitroguanosine based on the Gclamp skeleton by introducing thioalkylurea linker units of varying length (nitroG-grasp). The nitroG-grasp compound with C3 linker exhibited the most efficient guanylation even at low concentrations, supporting the selective complex formation for efficient reactivity for 8-nitro-G. The cyclen unit was attached to G-clamp molecule to recognize 8-oxoGTP, as a model compound of the cyclen-nitroG-grasp molecule. The Zn-complex of the cyclen-oxoG-clamp was able to discriminate 8-oxoGTP from GTP in aqueous media. The cyclen unit was also introduced to the nitroG-grasp molecule, which exhibited guanylation reaction for 8-nitroGMP without forming complex with zinc cation. In conclusion, this study has established the molecular basis for covalent capture of 8-nitroGTP and 8-nitroGMP.