Synthesis and conformation of deuterated spermidine for investigating weak interaction with polyanionic biomolecules
作者:Keisuke Maruyoshi、Tetsuo Demura、Takeshi Sagane、Nobuaki Matsumori、Tohru Oishi、Michio Murata
DOI:10.1016/j.tet.2004.04.056
日期:2004.6
evaluate its utility, 1H–1H spin coupling constants were measured as trihydrochloride or tripolyphosphate salt. The relevant coupling constant markedly decreased upon complexation to tripolyphosphate. Under neutral pH, where the net charge of tripolyphosphate became tetravalent, the coupling constant was small; as pH was lowered to 1.4, where the charge was divalent, the constant increased significantly. These
已知诸如亚精胺和亚精胺的多胺在生理条件下与聚阴离子生物分子相互作用。由于缺乏适当的方法,这些高度灵活的自行车的构象分析实际上是空前的。自旋-自旋偶合常数,常用于无环系统,由于其三亚甲基和四亚甲基部分的1 H NMR信号尚未解析,因此对多胺而言信息性不强。我们试图通过合成非对映异构的氘代亚精胺来解决这个问题,(1 S ∗,2 S ∗)-1,8-diamino-4-azaoctane-1,2,3,3,3,5,5,6,6,7, 7,8,8- d 12。为了评估其效用,1 H– 1H自旋偶合常数以三盐酸盐或三聚磷酸盐的形式测量。与三聚磷酸盐络合后,相关的偶联常数显着降低。在中性pH下,三聚磷酸盐的净电荷变为四价,偶合常数很小;当pH降低至1.4(电荷为二价)时,常数显着增加。这些数据清楚地表明,当与聚阴离子相互作用时,亚精胺经历构象变化以增加弯曲构象,这可以通过氘化的亚精胺有效地监测。