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Analysis Biomolecular Interactions of SARS-CoV-2 Spike Protein and RBD with Immobilized Aptamers by BLI (CAT#: STEM-MB-0098-CJ)

Introduction

Coronaviruses encode four major structural proteins, including spike protein (S), membrane protein (M), envelope protein (E), and nucleocapsid protein (N).SARS-COV-2 S protein is a large protein, ranging in length from 1,160 to 1,400 amino acids. This protein, a coronavirus glycoprotein, contains subunits S1 and S2 that act as trimmers on the virion surface. Spike proteins play a crucial role in the binding of ACE2 receptors to host cells (heart, lungs, etc.) and in the entry of viruses into host cells. RBD has a receptor (RBM) and forms an initial contact with a second ACE2 peptidase, which is a unique Freine (arginine-alanine-arginine-arginine) cleavage at the amino acid site 682-685 of SARS-CoV-2. SARS-COV-2 may regard RBD mutation as an interspecific adaptation during transmission. Mutations in RBD increase the structural stability of spike virus and decrease the binding of vaccine-induced antibodies.




Principle

Bio-Layer Interferometry (BLI) is an optical technique for measuring macromolecular interactions by analyzing interference patterns of white light reflected from the surface of a biosensor tip. BLI experiments are used to determine the kinetics and affinity of molecular interactions. In a BLI experiment, one molecule is immobilized to a Dip and Read Biosensor and binding to a second molecule is measured. A change in the number of molecules bound to the end of the biosensor tip causes a shift in the interference pattern that is measured in real-time.

Applications

Immunology/Inflammation; Vriology

Procedure

1. Detect Buffers and prepare samples. BLI experiments are set up with one molecule immobilised on the surface of the biosensor (load sample) and a second molecule in solution (the analytical sample).
2. Fix the load sample on the biocompatible biosensor while the analytical sample is in solution.
3. The biosensor tip is immersed in the solution so that the target molecule begins to bind to the analysis sample.
4. Set up and run the BLI experiment. Molecules bound to or dissociated from the biosensor can generate response curves on the BLI system; unbound molecules, changes in the refractive index of the surrounding medium or changes in flow rate do not affect the interferogram pattern.
5. Collect and analyse data on the BLI's system.

Materials

• Equipment: Fortebio Bio-Layer Interferometry (BLI)
• Sample Type: DNA, RNA, Protein, Antibodies, Peptides, Small Molecules
• Optionals: Expi293F Cells, Akta Pure Chromatography System