三链核酸poly(U)·poly(A)·poly(U)主链的振动位移

Displacements of Backbone Vibrational Modes of Poly(U)·poly(A)·poly(U)

基于三链核酸 poly(U)· poly(A)·poly(U)的螺旋对称性 ,利用晶格动力学方法 ,计算了三链核酸分子 poly(U)·poly(A)·poly(U)主链振动的本征矢 ,探讨了振动位移矢量和线二色光谱的关系。结果表明 ,对应着磷酸双氧的反对称振动谱线可以用于直接确定磷酸根的取向 ,精度大约为 1°。其他谱线必须通过对分子的简正分析来帮助确定分子的结构。

The displacements of backbone vibrational modes of poly(U)·poly(A)·poly(U) were calculated by lattice dynamics.The relationship between the linear dichroism and the vibrational displacement was discussed.The results indicate that only the linear dichroism bands assigned to symmetric dioxy vibrations of phosphate groups can be used to simply decide the orientation of phosphate groups.The error is about 1 degree. The other linear dichroism bands can be correlated with structure of poly(U)·poly(A)·poly(U) only by normal analysis.