Relative stability of AT and GC pairs in parallel DNA duplex formed by a natural sequence

FEBS Letters

Shchyolkina, A.K.¹  Borisova, O.F.¹  Chernov, B.K.¹  Tchurikov, N.A.¹ 

[1] V.A. Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow 117984, Russia

关键词: Parallel stranded DNA;    Stability of GC pairs;    AF;    acriflavine;    AO;    acridine orange;   

DOI  :  10.1016/0014-5793(93)81591-M

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

The low-cooperative melting of parallel DNA formed by a natural 40 bp long sequence from Drosophila: 5′-d(TGATTGATCGATTGTTTGCATGCACACGTTTTTGTGAGCG)-3′ 5′-d(ACTAACTAGCTAACAAACGTACGTGTGCAAAAACACTCGC)-3′ that possesses a normal nucleotide content was studied by using the special method of measuring the fluorescence of its complex with acriflavine as well as by conventional thermal denaturation. Acriflavine allows discrimination of the melting of AT and GC pairs because its fluorescence is quenched by neighbouring G bases. We have observed that about 40% of AT pairs melt at 14°C while the remainder melt at 42°C. The GC pairs remain stable up to ∼ 40°C and melt at 54°C. The higher stability of GC pairs suggests the formation of cis Watson-Crick pairs in parallel DNA.

【 授权许可】

Unknown