Abstract
The relationship between the amount of a target protein in a complex biological sample and its amount measured by selected reaction monitoring (SRM) mass spectrometry upon the affinity enrichment of the target protein with aptamers immobilized on a solid phase has been investigated. Human thrombin added in known concentrations to cellular extracts derived from bacterial cells was used as a model target protein. The affinity enrichment of thrombin in cellular extracts by means of the thrombin-binding aptamer immobilized on the surface of magnetic microbeads resulted in an approximately 10-fold increase of the concentration of the target protein and a 100-fold decrease of the low limit of a target protein concentration range where its quantitative detection by SRM was possible without interference from other peptides present in the tryptic digest.
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Original Russian Text © K.G. Ptitsyn, S.E. Novikova, Y.Y. Kiseleva, A.A. Moysa, L.K. Kurbatov, T.E. Farafonova, S.P. Radko, V.G. Zgoda, A.I. Archakov, 2018, published in Biomeditsinskaya Khimiya.
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Ptitsyn, K.G., Novikova, S.E., Kiseleva, Y.Y. et al. Use of DNA-Aptamers for Enrichment of Low Abundant Proteins in Cellular Extracts for Quantitative Detection by Selected Reaction Monitoring. Biochem. Moscow Suppl. Ser. B 12, 176–180 (2018). https://doi.org/10.1134/S1990750818020105
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DOI: https://doi.org/10.1134/S1990750818020105