Frontier Institute for Biomolecular Engineering Research, Konan University, 7-1-20 Minatojima-minamimachi, Chuo-ku, Kobe 650-0047, Japan.
Chem Commun (Camb). 2010 Feb 28;46(8):1299-301. doi: 10.1039/b922050j. Epub 2010 Jan 14.
We now present the first example in which triplet repeat DNAs adopt the i-motif structure at neutral pH by molecular crowding. Crowding stabilized the i-motif and the pK(a) of N3 of cytosine was raised in such a microenvironment. Molecular crowding is known to accelerate the formation of the multi-stranded i-motif while the triplet repeats adopt the single-strand structure.
现在我们提出了第一个例子,其中三重重复 DNA 在中性 pH 值下通过分子拥挤采用 i 型结构。拥挤稳定了 i 型结构,并且在这种微环境中胞嘧啶的 N3 的 pK(a) 值升高。已知分子拥挤加速了多链 i 型结构的形成,而三重重复则采用单链结构。