China Animal Husbandry and Veterinary Medicine ›› 2021, Vol. 48 ›› Issue (8): 2705-2712.doi: 10.16431/j.cnki.1671-7236.2021.08.003

• Biotechnology • Previous Articles     Next Articles

Bioinformatics Analysis,Purification and Identification of Alpha-1-acid Glycoprotein in Serum of Donkey

FEI Yaqi, TANG Chi, DENG Liang   

  1. College of Animal Science and Veterinary Medicine, Shenyang Agricultural University, Shenyang 110866, China
  • Received:2020-12-18 Online:2021-08-20 Published:2021-08-19

Abstract: This study was aimed to carry out the bioinformatics prediction and analysis of alpha-1-acid glycoprotein(α1-AGP) of donkey, and an efficient purification method of α1-AGP from donkey was established.Analysis of donkey by bioinformatics online software.The basic physical, chemical properties and the secondary and tertiary structures of α1-AGP were predicted.According to the results of the analysis, the method of cation chromatography gel filtration chromatography was used to purify donkey α1-AGP, after SDS-PAGE, matrix assisted laser desorption ionization-time offlight mass spectrometry (MALDI-TOF-MS) was used to identify donkey α1-AGP.The results showed that donkey α1-AGP was stable and hydrophilic, composed of 201 amino acids, the theoretical isoelectric point(pI) was 4.99, there were 5 potential N-glycosylation sites, and the average value of hydrophilicity(GRAVY) was -0.386.α-helix and β-sheet appeared orderly in the secondary structure, accounting for 88.56%, the GMQE value and the Z value of QMEAN were used to verify that the model was in a reasonable range.After purification by cation exchange chromatography and gel filtration chromatography, a total of 50 mL protein solution was obtained, and a clear protein strip was obtained after SDS-PAGE.After MALDI-TOF-MS and retrieved from NCBI database, the protein with the highest score was donkey α1-AGP, which was much higher than other proteins, indicating that α1-AGP was the main component in the purified protein.In this study, we proposed a new method for the purification and identification of α1-AGP from donkeys, which had the advantages of high purification rate, simple operation and less samples needed, and laid a theoretical foundation for the subsequent biological research and application of α1-AGP from donkeys.

Key words: donkey; alpha-1-acid glycoprotein (α1-AGP); bioinformatics; purification

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