Channel Mimetic Sensing Membranes for Nucleotides Based on Multitopic Hydrogen Bonding
作者:Koji Tohda、Shigeru Amemiya、Tohru Ohki、Shinichiro Nagahora、Shunitz Tanaka、Philippe Bühlmann、Yoshio Umezawa
DOI:10.1002/ijch.199700031
日期:——
negatively charged nucleotides that selectively bind to the electrically neutral membrane receptors. The ratios of the oxidation current decreases for solutions containing 3.0 mM 5′-GMP and for solutions containing 3.0 mM 5′-AMP were 1.30, 0.76, and 1.85 for monolayers based on receptors 1, 2, or 3, respectively. The monolayer based on receptor 3, which is capable of binding the guanine base by five hydrogen
核苷酸诱导的由核苷酸受体4-氨基-1-十八烷基-2-(1 H)-嘧啶酮(1),5-甲基-1-十八烷基-2,4(1 H,3 H)组成的定向单层的通透性变化)-嘧啶二酮(2)和1-(2-庚基十一烷基)-4-(8-(3-甲基脲基)-2-萘基)-酰胺-2-(1 H)-嘧啶酮(3)进行了检查。这些分子能够通过多位氢键结合鸟苷,腺苷和鸟苷核苷酸。首先在空气/水界面处形成单层,然后直接与高度定向的热解石墨(HOPG)电极接触。使用[Fe(CN)6 ] 4–作为渗透性标记物,通过循环伏安法评估了这些膜的渗透性。选择性地观察到基于受体1或3的5'-GMP诱导的膜通透性降低。另一方面,基于受体2的膜的渗透性降低在5'-AMP存在下比5'-GMP大。因此观察到的渗透性变化可归因于标记阴离子与选择性结合电中性膜受体的带负电荷的核苷酸之间的排斥性静电相互作用。对于基于受体1、2或3的单层,含有3.0mM 5'-GMP的溶液和含有3