Applications of the Biacore System
Biacore is a widely used method for analyzing molecular interactions based on the optical principle of surface plasmon resonance (SPR).
Surface plasmon resonance is a physical optical phenomenon. When a thin layer of gold (or other metal films, approximately 50 nm thick) is coated on the interface where total internal reflection occurs, a P-polarized light beam is incident on the prism surface within a specific angle range. This generates surface plasmon waves at the interface between the prism and the metal film (Au or Ag). When the propagation constant of the incident light matches that of the surface plasmon wave, resonance occurs among free electrons in the metal film, resulting in surface plasmon resonance.
During analysis, a ligand (such as an antibody or protein) is first immobilized on the sensor chip surface. The sample (analyte) is then flowed over the chip surface. If molecules in the sample interact with the immobilized biomolecules on the chip, the refractive index at the gold film surface changes, leading to a shift in the SPR angle. By monitoring these angular changes, information such as analyte concentration, binding affinity, kinetic constants, and specificity can be obtained, enabling real-time observation of biomolecular binding and dissociation dynamics.
Applications of Biacore
The Biacore system is widely applied in studying interactions between various biomolecules, including protein-protein, protein-peptide, protein-DNA, protein-drug, peptide-phage, and SPR-MS (mass spectrometry-coupled SPR) analyses. Its applications span life sciences, food safety, environmental monitoring, biomedicine, toxin and antibiotic detection, proteomics, drug screening and pharmacokinetic analysis, detection of specific peptide motifs, virus and pathogenic protein/receptor research, molecular recognition, immunomodulation, and immunoassays.
Kinetic Constant Determination
Traditional techniques for characterizing macromolecular interactions—such as Western blot (WB), ELISA, co-immunoprecipitation (Co-IP), chromatin immunoprecipitation (ChIP), electrophoretic mobility shift assay (EMSA), fluorescence resonance energy transfer (FRET), and yeast two-hybrid—often fail to detect target bands due to low protein expression or poor antibody sensitivity. Additionally, nonspecific antibody binding can lead to false-positive or false-negative results.
In contrast, Biacore enables real-time monitoring of mass changes on the chip surface, providing direct measurements of association and dissociation constants between molecules, thereby reflecting their binding affinity. Since the detection relies on mass changes at the chip surface, macromolecular interactions yield strong signals. Biacore can analyze binding kinetics between antibodies and antigens or proteins and small molecules. Compared to conventional antibody titer detection methods, Biacore offers rapid and precise quantification while capturing the entire dynamic binding and dissociation process.
Protein Structure-Function and Physiological Regulation
Hirano et al. used Biacore to demonstrate that the G576V mutation in SLR1 accelerates its dissociation from GID1, destabilizing the SLR1-GID1 complex and reducing SLR1 degradation. This leads to suppressed GA signaling, resulting in a dwarf phenotype in rice. Magulies et al. employed Biacore to investigate interactions among MHC, TCR, and peptide antigens. By measuring binding affinities and kinetic parameters, they proposed a compelling biological model: T-cell activation depends on the stimulation of numerous TCRs on a single T cell by abundant peptide-MHC complexes on antigen-presenting cells.
Disease Biomarker Diagnosis
Biomarkers are measurable biochemical indicators that reflect physiological, pathological, or therapeutic processes. Identifying disease-specific biomarkers aids in disease diagnosis, early prevention, and treatment monitoring. Conventional diagnostic methods—such as molecular diagnostics, immunoassays, and enzymatic assays—often suffer from low activity, poor stability, or insufficient sensitivity.
Biacore technology offers an innovative diagnostic approach by establishing calibration curves using biomarker standards, enabling highly sensitive and stable quantification of biomarkers in clinical samples.
Diagnostic Antibody Screening
In research, developing monoclonal antibodies against novel or low-abundance biomarkers often encounters sensitivity limitations, restricting detection to overexpressed cell lines. By expressing recombinant biomarker proteins and screening high-affinity monoclonal antibodies using Biacore, researchers can overcome sensitivity challenges, providing an efficient platform for diagnostic assay development.
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