Chinese Journal of Chromatography ›› 2017, Vol. 35 ›› Issue (3): 280-285.DOI: 10.3724/SP.J.1123.2016.10012

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Improved human plasma identification coverage based on random oligonucleotide library immobilized magnetic particles

DENG Nan1, LIANG Zhen2, BIAN Yangyang3, ZHANG Mingjian1, ZHANG Ke1, ZHANG Lihua2, ZHANG Yukui2   

  1. 1. Zhengzhou Tobacco Research Institute of China National Tobacco Corporation, Zhengzhou 450001, China;
    2. Dalian Institute of Chemical Physics, Key laboratory of Separation Sciences for Analytical Chemistry, Chinese Academy of Sciences; National Chromatographic Research and Analysis Center, Dalian 116023, China;
    3. Medical Research Centre, the First Affiliated Hospital of Zhengzhou University, Zhengzhou 450052, China
  • Received:2016-10-09 Online:2017-03-08 Published:2013-07-16
  • Supported by:

    National Natural Science Foundation of China (Nos. 21505158, 81600046).

Abstract:

A novel human plasma proteome sample pretreatment strategy was developed based on the interaction of random oligonucleotides with human plasma proteins, such as ionic interaction, affinity interaction, hydrophobic interaction, hydrogen bonding or spatial structure and so on. Random oligonucleotide library was immobilized on the magnetic particles by biotin-avidin interaction, and dispersed in 20 mmol/L Tris-HCl buffer (pH 7.4), followed by incubation with plasma proteins. Two elution systems were used to elute the proteins interacted with random oligonucleotides, separately. Nano-RPLC-ESI-MS/MS analysis was performed for protein identification. The number of proteins identified after treatment was increased by 29.5%, and two elution systems displayed good complementarity (26.7%). The total ratio of spectral counts of the top ten high abundant protein in human plasma was decreased from 31.82% to 21.31% (elution system 1) and 26.20% (elution system 2). In all the proteins identified, the lowest abundant protein (0.29 ng/mL) was only identified after magnetic nanoparticles@single-stranded DNA (MNP@ssDNA) treatment, which demonstrated that this strategy not only decreased the abundance of highly abundant proteins, but also provided a new idea for digging more lowly abundant proteins.

Key words: high abundance, low abundance, plasma, protein, random oligonucleotide library, spectral count

CLC Number: