摘要
设计了与富含胞嘧啶(C)的DNA序列d(C4)相关的DNA序列d(C4),d(TC4),d(AC4),d(T2C4),d(A2C4),d(C4T),d(C4A)和d(TC4T);采用电喷雾质谱测定发现这些序列形成四分子非共价复合物离子,根据离子的相对丰度可确定形成四链i-motif结构的数量和可能性;同时考察了腺嘌呤(A)和胸腺嘧啶(T)在d(C4)序列的5'和3'端对其形成四分子i-motif结构的影响.结果表明,在d(C4)的5'端增加A碱基或T碱基更易形成四分子复合物;5'端含T碱基比含A碱基更利于形成四分子复合物;而在d(C4)序列中增加2个A碱基或T碱基比增加相应的单个碱基形成了更高丰度的四分子离子峰.
A series of cytosine-rich DNA sequence d(C4) related DNA strands,including d(C4),d(TC4),d(AC4),d(T2C4),d(A2C4),d(C4T),d(C4A) and d(TC4T),was designed in this study,and the tetramolecular ions formed by the sequences were measured with electrospray ionization mass spectrometry.The goal is to obtain the information on the formation of the tetramolecular i-motif influenced by adenine(A) and thymine(T) that present at 5′ and 3′ ends of d(C4).The results showed that when A base or T base was added at 5′ end of d(C4),it is easier for the sequence to form tetramolecular ion,especially for thymine,when adding two A or T bases to d(C4),the sequence generates higher abundant of the tetramolecualr ion.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2011年第12期2748-2751,共4页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:20575066
20975044)资助