Biotechnology Bulletin ›› 2021, Vol. 37 ›› Issue (8): 307-318.doi: 10.13560/j.cnki.biotech.bull.1985.2021-0183

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Comparative Study on Methods of Analyzing Proteome in Blood Samples

WANG Zhi-bo1,2(), WANG Dao-ping2, MIAO Lan1,3, LI Ying1, PAN Ying-hong2(), LIU Jian-xun1,3()   

  1. 1. Institute of Basic Medical Science,Xiyuan Hospital,China Academy of Chinese Medical Science,Beijing 100091
    2. Institute of Crop Science,Chinese Academy of Agricultural Sciences,Beijing 100081
    3. Beijing Key Laboratory of Pharmacology of Traditional Chinese Medicine,Beijing 100091
  • Received:2021-02-09 Online:2021-08-26 Published:2021-09-10
  • Contact: PAN Ying-hong,LIU Jian-xun E-mail:wzb19950916@163.com;panyinghong@caas.cn;liujx0324@sina.com

Abstract:

The objective is to compare and optimize the technologies of blood sample preparation and mass spectrometry analysis,for further studying and mining proteomic information in blood samples. A Q-Exactive Plus mass-spectrometer was used to compare the proteome composition of R. norvegicus blood samples prepared from plasma,serum and serum with high-abundance protein removed. The efficiency of trypsin digestion of serum proteins was also investigated by using conventional digestion,45℃ digestion,heat assisted digestion,repeated heat assisted digestion,urea assisted digestion and variable temperature digestion. Then the qualitative and quantitative characteristics of three mass spectrometry analysis methods,Data-Dependent Acquisition(DDA),Data Independent Acquisition(DIA)and Parallel Reaction Monitoring(PRM)were compared. Finally,the blood sample of R. norvegicus was analyzed based on optimized proteomic technologies. After removing high-abundance protein from serum samples,the number of identified proteins was higher and the quantitative repeatability was better. The number of identified proteins and peptides,and the rate of matched mass spectrum were relatively high when serum samples digested by heat assisted digestion and variable temperature digestion. The efficiency of these two digestion methods and the repeatability of their qualitative and quantitative data were acceptable. Compared the three mass spectrometry methods,DDA was more convenient,DIA was highly reproducible and PRM was more accurate. The 490,490 and 504 proteins were identified in 3 repeated experiments respectively when high-abundance protein was removed from serum samples and digested proteins with heat assisted-variable temperature digestion and collected data by DDA method. While a total of 590 proteins were detected,and repetition rate of identified protein was 69.8%. In conclusion,the optimized method has advantages of simple operation,high protein identification rate and good repeatability,and is suitable for proteomic analysis of blood samples.

Key words: sample preparation, enzymatic digestion, data acquisition, blood sample, proteomics