Evaluation of two high-abundance protein depletion kits and optimization of downstream isoelectric focusing

  • Authors:
    • Fanghua Qiu
    • Tieying Hou
    • Dehong Huang
    • Zhifeng Xue
    • Dongyan Liang
    • Qiuming Li
    • Weimiao Lin
  • View Affiliations

  • Published online on: October 1, 2015     https://doi.org/10.3892/mmr.2015.4417
  • Pages: 7749-7755
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Abstract

Disease biomarkers for diagnostic and prognostic purposes are most likely within an extremely low concentration range and are thus masked by the presence of high‑abundance proteins. Therefore, removing high‑abundance proteins is the main challenge for identifying disease biomarkers. In addition, the solution obtained from high‑abundance protein depletion kits contains a rich array of compounds, which interfere with isoelectric focusing (IEF). In the present study, the effect of two commercial kits was evaluated and the downstream IEF protocol was optimized. High‑resolution results could be obtained according to the following conditions: The ProteoPrep Blue Albumin and IgG Depletion kit depleted albumin and IgG; immobilized pH gradient strips (typically 18 cm) were rehydrated with sample buffer containing 250 µg serum proteins at 30 v for 6 h, 60 v for 6 h, 200 v for 2 h, 500 v for 2 h, 1,000 v for 2 h, 5,000 v for 2 h, 10,000 v for 2 h and then focusing at 10,000 v up to 110 k vhs. In addition, the protein spots identified by matrix‑assisted laser desorption ionization time‑of‑flight mass spectrometry demonstrated that all proteins had a low abundance. The present study not only provides a definite and effective method for removing high‑abundance proteins, but also provides a proper protocol (protocol C) for downstream IEF. The present study includes a comprehensive investigation of serum proteomics, which paves the way for serum protein research.
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November-2015
Volume 12 Issue 5

Print ISSN: 1791-2997
Online ISSN:1791-3004

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Spandidos Publications style
Qiu F, Hou T, Huang D, Xue Z, Liang D, Li Q and Lin W: Evaluation of two high-abundance protein depletion kits and optimization of downstream isoelectric focusing. Mol Med Rep 12: 7749-7755, 2015
APA
Qiu, F., Hou, T., Huang, D., Xue, Z., Liang, D., Li, Q., & Lin, W. (2015). Evaluation of two high-abundance protein depletion kits and optimization of downstream isoelectric focusing. Molecular Medicine Reports, 12, 7749-7755. https://doi.org/10.3892/mmr.2015.4417
MLA
Qiu, F., Hou, T., Huang, D., Xue, Z., Liang, D., Li, Q., Lin, W."Evaluation of two high-abundance protein depletion kits and optimization of downstream isoelectric focusing". Molecular Medicine Reports 12.5 (2015): 7749-7755.
Chicago
Qiu, F., Hou, T., Huang, D., Xue, Z., Liang, D., Li, Q., Lin, W."Evaluation of two high-abundance protein depletion kits and optimization of downstream isoelectric focusing". Molecular Medicine Reports 12, no. 5 (2015): 7749-7755. https://doi.org/10.3892/mmr.2015.4417