A Method of Lysate Preparation to Improve the Isolation Efficiency of Protein Partners for Target Proteins Encoded by the Genes of Human Chromosome 18

  • P.V. Ershov Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • Y.V. Mezentsev Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • E.O. Yablokov Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • L.A. Kaluzhskiy Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • I.V. Vakhrushev Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • O.V. Gnedenko Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • A.V. Florinskaya Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • A.A. Gilep Institute of Bioorganic Chemistry of the National Academy of Sciences of Belarus, 5, bld. 2 V.F. Kuprevich str., Minsk, 220141 Belarus
  • S.A. Usanov Institute of Bioorganic Chemistry of the National Academy of Sciences of Belarus, 5, bld. 2 V.F. Kuprevich str., Minsk, 220141 Belarus
  • K.N. Yarygin Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
  • A.S. Ivanov Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia
Keywords: protein complexes; acid treatment and neutralization; lysate preparation; HepG2; surface plasmon resonance (SPR)

Abstract

The aim of this work was to test modifications of the standard protocol for the sample preparation of cell/tissue lysate before performing the affinity isolation of lysate protein partners for the target protein (bait protein) which is covalently immobilized on an inert sorbent (e.g. BrCN-, SH-Sepharose 4B) or a carrier (e.g. paramagnetic nanoparticles). The series of our previous works on applying the approach to direct molecular fishing procedure with combination of affinity chromatography and LC-MS/MS analysis using a number of proteins, encoded by the genes of human chromosome 18, have shown that there are at least two problems affecting the specificity and the effectiveness of this procedure. These include: (i) redundancy of the background proteins in the eluates from an affinity sorbent (carrier) due to isolation of multiprotein complexes “labeled” with a direct protein partner which binds with a bait protein immobilized on the sorbent; (ii) low enrichment of the eluates with appropriate protein partners due to the fact that some direct protein partners in the lysate exist in stable “wild type” complexes with the bait protein itself. This means that latter group of protein partners will not be sufficiently isolated from lysate. Therefore, in order to increase the specificity and efficiency of affinity isolation of protein partners for the bait protein, we modified the standard protocol of lysate preparation and the preliminary step on dissociation of lysate protein complexes was added. Several model experiments for the choice of regeneration solution, assessment of their efficiency in the dissociation of lysate protein complexes as well as the stability and binding capacity of proteins were performed under the control of surface plasmon resonance (SPR) biosensor Biacore 3000 using HepG2 cell lysate. It was shown that acid treatment and incubation of the cell lysate for one min on ice (final lysate dilution 20 times) and subsequent neutralization (pH shift from 2.0 to 7.4) resulted in maximal dissociation of the lysate protein complexes without significant negative effects on the protein-protein interactions tested.

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Published
2019-03-25
Section
PROTOCOLS OF EXPERIMENTS, USEFUL MODELS, PROGRAMS AND SERVICES