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#biomolecular interaction

2 public questions tagged with this topic.

Protein-Protein Interaction

What happens during the dissociation phase of SPR?

A typical SPR cycle comprises baseline, association, dissociation, and regeneration. During association, analyte injected binds ligand, signal rises. When analyte injection stops and running buffer continues, free analyte concentration near surface drops to zero, preventing rebinding and favoring net complex decay. Bound analyte detaches according to off-rate kinetics, causing gradual decline in resonance units. Dissociation phase therefore reports kinetic stability of complex. Ligand addition occurs earlier, binding occurs in association, regeneration with harsh buffer follows after to strip remaining bound material for next cycle.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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Protein-Protein Interaction

In SPR, analyte is:

In SPR terminology, ligand denotes macromolecule covalently immobilized to sensor chip dextran via amine coupling, while analyte is soluble binding partner in mobile phase. During association phase, analyte solution is injected at constant flow over ligand surface, allowing complex formation monitored as increase in resonance units. After injection, buffer flow induces dissociation. This orientation distinguishes immobilized state from flowing state. Detection is optical plasmon shift, not ELISA enzymatic reaction, and analyte is never immobilized or used for coating in conventional setup.

Ref: NCERT Biology Class XII Principles on Klenow fill-in labeling, Lehninger Chapter 9 DNA cloning techniques, and Molecular Cloning by Sambrook Chapter 10 documenting end-labeling of cohesive termini.

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