Biomedical Chemistry: Research and Methods, 2018, 1(4), e00053

Signal Enhancement of SPR Biosensor Detection by Using of Gold Nanoparticles for Human beta-2-Microglobulin as a Model Protein Biomarker

Yu.V. Mezentsev, O.V. Gnedenko, P.V. Ershov*, A.S. Ivanov

Institute of Biomedical Chemistry, 10 Pogodinskaya str., Moscow, 119121 Russia; *e-mail: pavel79@inbox.ru

Key words: surface plasmon resonance (SPR); optical biosensor; signal enhancement; gold nanoparticles; protein-protein interactions

DOI:10.18097/BMCRM00053

The whole version of this paper is available in Russian.

The highly sensitive method of surface plasmon resonance (SPR) detection of low concentrations of target proteins based on the biosensor signal enhancement by using gold nanoparticles (similar to «sandwich» assay type) is described. The commercial protein preparations of beta-2-microglobulin (B2M) as a model biomarker and polyclonal (Pab) and monoclonal antibodies (Mab) to B2M were used. It has been shown that this universal and reproducible method can be applied for SPR analysis of other protein biomarkers by analogy with the biomarker protein B2M. The present work is also focused on the experimental protocol description. The protocols of gold nanoparticles (GNP) synthesis, obtaining the conjugates of Pab/GNP and measuring their concentration, the protocol of Mab covalent immobilization on the optical chip CM5 of a biosensor and also SPR registration of molecular interactions Mab-biomarker and in the «sandwich» assay type Mab-biomarker-Pab or Mab-biomarker-Pab/GNP are considered in detail.

Figure 1. A sensogramm of covalent amino coupling immobilization of Mab to B2M onto the optical chip CM5.
Figure 2. The absorption spectrum of suspension of gold nanoparticles at a concentration of 20 mkg/mL.
Figure 3. A calibration plot for different gold nanoparticles concentrations (1.25, 2.5, 5, 10, 20 mkg/mL). The red point in the plot is corresponded to suspension of gold nanoparticles conjugated with polyclonal antibodies to B2M.
Figure 4. The sensogramms of SPR signals enhanced by injections either Pab (red line) or Pab/GNP conjugates (green line) while detecting B2M as a biomarker. The onset of sample injections of 100 pM B2M and Pab (or Pab/GNP conjugates) are shown by arrows 1 and 2, respectively.

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Table 1. Immobilization protocol for Mab to B2M. Executed commands were derived from the queue window Biacore 3000 Control Software.

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Table 2. Protocol of SPR registration of protein – protein interactions. Executed commands were derived from the queue window Biacore 3000 Control Software.

ACKNOWLEDGEMENTS

This work was performed within the framework of the Fundamental Research Program of State Academies of Sciences for 2013-2020. SPR measurements were performed in the “Human Proteome” Core Facility of the Institute of Biomedical Chemistry (Russia, Moscow) which is supported by Ministry of Education and Science of the Russian Federation (unique project ID RFMEFI62117X0017).

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