New permanently charged phenanthridinium-nucleobase conjugates. Interactions with nucleotides and polynucleotides and recognition of ds-polyAH+
作者:Lidija-Marija Tumir、Ivo Piantanida、Iva Juranovi? Cindri?、Tomica Hrenar、Zlatko Mei?、Mladen ?ini?
DOI:10.1002/poc.680
日期:2003.12
The conjugates form 1:1 complexes in water with either complementary or non-complementary nucleotides, giving log Ks values between 1 and 2 and showing a lack of any base recognition. Also, the binding studies with single-stranded polynucleotides showed no preference of conjugates to polynucleotides containing complementary nucleobases. At pH 5, the N-methylphenanthridinium–adenine conjugate exhibited
以水溶性亚硫酸氢盐的形式制备N-甲基-8-氨基菲啶鎓-尿嘧啶和-腺嘌呤共轭物,它们具有通过亚甲基间隔基连接在菲啶鎓8-氨基上的核碱基。结合物的光谱特征揭示了在水中的折叠构象的形成,其特征在于菲啶鎓单元和拴系的核碱基之间的分子内芳族堆积。缀合物在水中与互补或非互补核苷酸形成1:1的复合物,log K s值介于1和2之间,并且缺乏任何碱基识别。而且,对单链多核苷酸的结合研究表明,缀合物对含有互补核碱基的多核苷酸没有偏爱。在pH为5时,N-甲基菲啶鎓-腺嘌呤结合物表现出对双链(ds-)polyAH +的优先结合,而其质子化类似物则优选与polyU结合。结果表明,缀合物中质子化或带永久电荷的嵌入剂单元的存在极大地改变了其对多核苷酸的结合偏好。版权所有©2003 John Wiley&Sons,Ltd.