用非线性预测方法研究蛋白质序列的特性(Ⅱ)

Nonlinear Prediction Analysis of Properties in Protein Sequences(Ⅱ)

为了研究蛋白质序列的内在特性,通过非线性预测方法将蛋白质序列和随机序列以及混沌序列进行比较。前期研究可知:每条蛋白质序列的每个特征序列的误差比值(E-D)图具有特异性,和随机序列的E-D图相比具有明显差异。另外每条蛋白质序列的E-D图曲线大体都在1附近波动,波动走势没有任何规律可言。通过与给定混沌序列的E-D图相比较,发现两者之间具有相似的特性。由此得出:蛋白质序列具有非随机性,可能具有非线性(混沌)性。

In order to study the properties in protein sequences, three of the characteristic sequence＇ E-D graphs of protein sequences in every four classes with random sequences by uding the nolinear prediction method was investigated. From the latest research, it was known that each characteristic sequences＇ E-D graphs of the protein sequences were specific, and different from that of the random sequences. Furthermore, every curves of protein sequences fluctuated around 1, and the walks of waves had not any pattern. The difference of E-D graphs among four classes of protein sequences was very large. By comparing the E-D graphs of the protein sequences with the chaotic sequences, it was also found similar properties. It was concluded that the protein sequences were non-random, and may be with the nonlinear properties such as chaos.