›› 2018, Vol. 45 ›› Issue (12): 3337-3345.doi: 10.16431/j.cnki.1671-7236.2018.12.004

Previous Articles     Next Articles

Cloning,Prokaryotic Expression and Bioinformatics Analysis of toxA-N Gene of Pasteurella multocida in Goat

HUANG Haifeng, WANG Chengqiang, ZHANG Zhenxing, LI Baobao, ZHENG Yiying, AN Qi, ZHANG Mengmeng, ZHANG Luyin, ZHU Shu, CAO Ruiyong, YANG Xiaojian, NIE Xin, DU Li, WANG Fengyang   

  1. Key Laboratory of Animal Genetic Engineering of Haikou City, Key Laboratory of Tropical Animal Reproduction & Breeding and Epidemic Disease Research of Hainan Province, College of Animal Science and Technology, College of Tropical Agriculture and Forestry, Hainan University, Haikou 570228, China
  • Received:2018-07-31 Online:2018-12-20 Published:2018-12-21

Abstract:

This study was aimed to clone,prokaryotically express and purify toxA-N gene of Pasteurella multocida in goat,and analyze the expressed protein toxA-N by bioinformatics,which provided a reference for exploring the relevant characteristics of the Pasteurella multocida toxin gene in goat.The genome of the above-mentioned bacteria was used as a template,and the primer was designed with reference to the Pasteurella multocida HN06 toxA gene sequence published in GenBank(accession No.:CP003313.1),and the target fragment was amplified by PCR.The recombinant plasmid pET28a(+)-toxA-N was constructed and then transferred to E.coli BL21(DE3) competent cells.After inducted by IPTG,the expressed proteins were characterized by Coomassie blue staining,Western blotting,protein purification and bioinformatics softwares.The results showed that the 1 515 bp gene fragment was successfully amplified,and the two fragments of 5 369 and 1 515 bp were digested by BamH Ⅰ and Not Ⅰ,indicating that the recombinant plasmid pET28a(+)-toxA-N was successfully constructed.The Coomassie blue staining and Western blotting results showed that a size of about 60 ku toxA-N protein was successfully expressed by IPTG induction.Bioinformatics analysis results showed that toxA-N protein was an inclusion body with a molecular formula of C2635H4002N664O797S17,the total number of atoms was 8 115,the extinction coefficient was 84 480,the instability index was 43.50,and the average hydrophilicity was -0.381.In the secondary structure of toxA-N protein,α-helix,β-turn,extended chain and random coil accounted for 53.47%,2.77%,11.28% and 32.48%,respectively,which were consistent with the prediction results of the tertiary structure.In summary,this study revealed the relevant properties of the Pasteurella multocida toxin by preliminary study of toxA-N gene,which was of great significance for disease prevention,diagnosis and treatment of livestock.

Key words: Pasteurella multocida of goat; toxA-N gene; subcloning; bioinformatics analysis

CLC Number: