HIV-1 CRF01_AE毒株gp41蛋白生物信息学预测

Bioinformatic prediction of gp41 protein in HIV-1 CRF01_AE strain

摘要:

目的：对HIV-1 gp41蛋白的膜外区和跨膜区进行预测，并分析该蛋白的结构和功能。方法：从NCBI GenBank数据库获取gp41基因及其蛋白编码序列，利用ExPASy ProtParam tool、ProtScale、SignalP 4.0 Server、TMHMM Server v.2.0、SWISS-MODEL、PredictProtein等工具对gp41蛋白的生物学特性进行预测。结果：HIV-1 gp41基因ORF长度为666 bp，编码222个氨基酸，蛋白分子式为C1164H1815N317O325S6，等电点（isoelectric point，pI）＝8.60，属于稳定、疏水性蛋白。该蛋白具有跨膜区，信号肽切割位点位于第20和21位氨基酸处。其二级结构由无规则卷曲、β折叠和α螺旋组成，属于全螺旋型蛋白。而且该蛋白具有N-端信号肽，能引导蛋白分泌到胞外。此外gp41蛋白具有4个蛋白质-蛋白质和1个蛋白质-核酸结合位点，这些位点能调控gp41蛋白的多种生物学功能。结论：对gp41蛋白的结构和功能进行了预测，为深入研究其参与疾病发生发展的分子机制奠定了基础。

Abstract:

Objective：To predict the extracellular domain and transmembrane domain of HIV-1 gp41 protein，and to investigate its structure and function. Methods：The gp41 gene and its protein-encoding sequence were obtained from the NCBI GenBank database. ExPASy ProtParam tool，ProtScale，SignalP 4.0 Server，TMHMM Server v.2.0，SWISS-MODEL and Predict Protein software were used to predict the biological properties of gp41 protein. Results：The HIV-1 gp41 gene had an ORF length of 666 bp and encoded 222 amino acids. Its molecular formula was C1164H1815N317O325S6，and the isoelectric point was 8.60. It was a stable and hydrophobic protein. This protein had a transmembrane region and the signal peptide cleavage site was located between the amino acids 20 and 21. Its sec－ondary structure mostly consisted of random coil，β-fold，and α-helix，and thus it was an all-helix protein. It also had an N-terminal signal peptide and guided the extracellular secretion of protein. In addition，gp41 protein had 4 protein-protein binding sites and 1 protein-DNA binding site，which could regulate various biological functions of gp41 protein. Conclusion：This study predicts the structure and function of gp41 protein and lays a foundation for research on the molecular mechanism of gp41 protein in disease de－velopment and progression.