Type

Journal Article

Authors

R O'Kennedy
J G Quinn

Subjects

Microbiology

Topics
kinetics hydrogel staphylococcal protein a sensitivity and specificity dextrans chemistry immunology glutathione transferase immunoglobulins biosensing techniques

Biosensor-based estimation of kinetic and equilibrium constants. (2001)

Abstract The steady-state affinity constant for the interaction of glutathione S-transferase (GST) with anti-GST immunoglobulin (IgG) was determined by solution-phase equilibrium analysis. A Biacore concentration assay for the determination of free anti-GST IgG was employed giving a Kd value of 6.83 x 10(-10) M. A simple 1:1 solution-phase, equilibrium model approximated the data well. Furthermore, saturation studies showed a maximum occupation of approximately 50%. The choice of affinity-capture ligand, used to anchor anti-GST IgG to the hydrogel, influenced the interaction curves, as evidenced by contact-time-dependent dissociation-phase curves. This was apparent when performing the analysis on anti-mouse Fc-coated surfaces. When the interaction was conducted on a protein A-coated CM5 sensor chip, the interaction conformed well to ideal behavior and was selected for kinetic analysis of the GST interaction.
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Full list of authors on original publication

R O'Kennedy, J G Quinn

Experts in our system

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R O'Kennedy
Dublin City University
Total Publications: 197