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Chapters
- 00:00Title
- 01:38Introduction
- 02:30Experimental Design
- 03:58Immobilization of the Ligand Papain for CFCA Analysis
- 07:34Determining Cystatin B Concentration Using the CFCA Assay
- 11:07Measuring the Kinetics of Cystatin B binding to Papain
- 17:13CFCA assay and Kinetics of Cystatin B binding to Papain Representative Results
- 18:47Conclusion
We apply label-free protein interaction analysis using Biacore X100 for structure-function analysis of the binding of several cystatin B mutants to papain through kinetic characterization. Calibration-free concentration analysis (CFCA) measures the concentration of protein with retained binding activity without the need for a standard curve. We show that confirmation of concentrations using CFCA increases the reliability of the kinetic analysis and that kinetic constants can reliably be determined even if the activity of a recombinant protein is reduced.
Tags
Protein ConcentrationKineticsAffinity DeterminationStructure-function AnalysisCysteine Protease InhibitorCystatin BPapainReal-time Label-free AnalysisBiacore X100Point MutationsInteractionCalibration-free Concentration Analysis (CFCA)A280Single-cycle Kinetics (SCK)Association Rate Constant (ka)Affinity (KD)Reliable ResultsInteraction Mechanism
