Within oligonucleotides 2-azapurine and especially 2-azaadenine bases form specifically base pairs with guanine. This base pair is of analogous stability as an adenine-thymine but less stable than a guanine-cytosine base pair. Therefore, the incorporation of 2-azaadenine residues into oligonucleotides instead of cytosine leads specifically to hybridization complexes with nucleic acids with homogenous stability. This is useful for the adaptation of the stabilities of different oligonucleotide sequences in all kinds of hybridization techniques, for example in oligomer chip technology.
在寡
核苷酸中,2-
氮杂
嘌呤和特别是2-
氮杂
腺嘌呤碱基可以与
鸟嘌呤形成特异性的碱基对。这种碱基对的稳定性类似于
腺嘌呤-胸腺
嘧啶,但不如
鸟嘌呤-
胞嘧啶碱基对稳定。因此,将2-
氮杂
腺嘌呤残基纳入寡
核苷酸中,而不是
胞嘧啶,可以导致与同种稳定性的
核酸形成特异性的杂交复合物。这对于在各种杂交技术中适应不同寡
核苷酸序列的稳定性非常有用,例如在寡聚物芯片技术中。