ACTA VETERINARIA ET ZOOTECHNICA SINICA ›› 2016, Vol. 47 ›› Issue (9): 1785-1794.doi: 10.11843/j.issn.0366-6964.2016.09.006

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Prokaryotic Expression,Purification and Bioactivity Identification of Recombinant Chicken Visfatin Protein

ZHANG Pan-pan # ,SHANG Peng-fei # ,TIAN Fang-yuan,HAN Rui-li,JIANG Rui-rui,SUN Gui-rong,KANG Xiang-tao,LIU Xiao-jun,TIAN Ya-dong*   

  1. (Henan Innovative Engineering Researching Center of Poultry Germplasm Resources,College of Animal Science and Veterinary Medicine,Henan Agricultural University,Zhengzhou 450002,China)
  • Received:2016-03-02 Online:2016-09-23 Published:2016-09-23

Abstract:

The objective of the present study was to obtain recombinant chicken Visfatin protein with biological activity.The total RNA was extracted from livers of AA broilers.The Visfatin cDNA was first amplified by qRT-PCR and cloned into pGEM-T vector.The cDNA was then cut out from pGEM-T vector by digestion with endonuclease NcoⅠ and XhoⅠand inserted into corresponding cloning sites of the plasmid pET-30a.The positive recombinant plasmid designated as pET-30a-Visfatin was transformed into E.coli BL21 (DE3) competent cells.The cells containing pET-30a-Visfatin were identified.The conditions of IPTG induction were optimized by examining the expression level of recombinant protein using SDS-PAGE analysis.The recombinant protein was purified by Nickel ion affinity chromatography.The identification of the purified recombinant protein was checked by Western blot and the bioactivity was examined by looking into differentiation status of 3T3-L1 cells.A fragment which was the same size to prediction was observed when the recombinant plasmid pET-30a-Visfatin was digested with endonuclease NcoⅠ and XhoⅠ.It indicated that the recombinant expression vector was constructed successfully.The SDS-PAGE analysis revealed that the optimum conditions of induction were 0.4 mmol•L-1 IPTG,pH 8.0,at 30 ℃ for 10-12 h.The molecular weight of the recombinant protein was about 60 ku,which was the same to prediction.The Western blot analysis indicated that the recombinant protein could be recognized by anti-His antibody.Additionally,the Oil Red O stain assay showed that there were more lipid droplets formation in 3T3-L1 cells induced by Visfatin than that in the controls.Meanwhile,the results of qRT-PCR revealed that the expression levels of genes involved in cell differentiation such as PPARγ, aP2,FAS and C/EBPα increased significantly (P<0.05) when 3T3-L1 cells induced by Visfatin.This study successfully established a standardized expression program for recombinant chicken Visfatin protein production,and obtained the purified recombinant protein with biological activity,which laid a foundation for further research in the field of poultry.

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