A Model for Interactions of Amino Acid Side Chains with Watson-Crick Base Pair of Guanine and Cytosine. Crystal Structures of 9-(2-Carboxyethyl)guanine and Its Crystalline Complex with 1-Methylcytosine
作者:Sigeo Fujita、Akio Takenaka、Yoshio Sasada
DOI:10.1246/bcsj.57.1707
日期:1984.7
carboxyl group is doubly hydrogen-bonded with N(2) and N(3) of the guanine moiety of the adjacent molecule, N(2)–H···O distance being 2.939(5) A and N(3)···H–O 2.660(5) A for N···O. In cx9G: m1C, the guanine moiety and 1-methylcytosine form a Watson-Crick base pair. The carboxyl group takes an O=C–OH antiperiplanar conformation and is hydrogen-bonded with N(7) of guanine in the adjacent base pair. This
为研究涉及鸟嘌呤碱基的蛋白质-核酸相互作用,成功合成了一种新化合物9-(2-羧乙基)鸟嘌呤,并制备了其与1-甲基胞嘧啶的结晶复合物。9-(2-羧乙基)鸟嘌呤 (cx9G) 和 cx9G 与 1-甲基胞嘧啶 (cx9G:m1C) 的复合物的晶体结构通过 X 射线分析确定。晶体数据:cx9G,P21/c,a=12.221(3),b=11.022(2),c=6.961(2) A,β=100.22(2)°;cx9G:m1C, P\bar1, a=8.932(1), b=12.370(1), c=7.139(1) A, α=85.01(1), β=99.21(1), γ=86.64(1) °。在 cx9G 中,羧基与相邻分子鸟嘌呤部分的 N(2) 和 N(3) 形成双氢键,N(2)–H...O 距离为 2.939(5) A 和 N( 3)…H–O 2.660(5) A 代表 N…O。在 cx9G: m1C