Acta Agriculturae Zhejiangensis ›› 2020, Vol. 32 ›› Issue (12): 2138-2146.DOI: 10.3969/j.issn.1004-1524.2020.12.04

• Animal Science • Previous Articles     Next Articles

Construction of prokaryotic expression vector of chicken Prnp gene and expression in Escherichia coli

LI Xianchun1(), LU Yan2, MAO Yaofang1, YANG Haifeng1, YU Haishan1, MA Yonghua11,*(), WAN Xuerui1,*()   

  1. 1. College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China
    2. State-Owned Assets Management Office, Northwest Normal University, Lanzhou 730070, China
  • Received:2020-04-09 Online:2020-12-25 Published:2020-12-25
  • Contact: MA Yonghua1,WAN Xuerui

Abstract:

In order to construct the prokaryotic expression vector of chicken Prnp gene and express it in Escherichia coli, and to provide materials for the preparation of monoclonal antibodies against chicken prion protein, primers were designed according to chicken Prnp genome sequence reported by GenBank and the polyclonal site of pET-28a plasmid. Using healthy chicken whole blood genomic DNA as material, the Prnp gene of chicken was amplified by PCR. The target gene fragment was connected with pET-28a vector to construct recombinant prokaryotic expression vector. The recombinant bacteria were transformed into E. coli BL21(DE3) competent cells and induced by isopropyl-β-D-thiogalactoside (IPTG). The expressed recombinant protein was identified by SDS-PAGE. The results showed that the expression of recombinant protein was the highest at the final inducer concentration of 0.08 mmol·L -1, 16 ℃, 220 r·min-1 for 7 hours. To sum up, the recombinant expression strain of pET-28a-ChPrnp was successfully constructed in this study, which provides a method for the study of the structure, physiological function and pathogenic mechanism of Prnp prion protein.

Key words: chicken, Prnp gene, recombinant expression vector, prokaryotic expression

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