Abstract: [Abstract] Objective To evaluate the effect of chlamydiaphage virus protein2(Vp2) on the recombinant virus and virus screening research, and it clinical value thereof.Methods To compare the Vp2protein sequences to get the conserva? tive region with COBALT. A phylogenetic tree was built with ProteinBlast of Distance tree. The amino acid sequence in the high conservative region was predicted by the methods of Gamier-Robson and Chou-Fasman, and its flexibe regions were predicted by Karplus method. The hydrophilicity plot was predicted by Kyte-Doolittle and Hopp-Woods method. The sur? face probability was analysed by Emini, and the antigenic index was analysed by Jameson-Wolf method. Results The six Chlamydiaphage Vp2proteins were the highly conserved sequences. There were obvious differences between Chp1Vp2and other5Vp2proteins. There were the main structure-alpha helix and some cell epitopes in the high conserved region.Con? clusion Vp2protein is the important component of chlamydia phage capsid with the conservative nature. Vp2protein has complicated structures and high conservative region with strong immunogenicity, playing a practical value of research in vi? rus recombinantment and screening the wild strains of chlaymdia trachomatis phage.

Key words: virus, phage, protein, information