Funder

Center for Academic Enrichment and Outreach

Document Type

Poster

Publication Date

2018

Publisher

University of Nevada, Las Vegas; Center for Academic Enrichment and Outreach

Publisher Location

Las Vegas, NV

Abstract

The binding affinity between an enzyme and its substrate is often dependent on the pH of the local environment. Knowing the pH at which reduced glutathione (GSH) binds with the highest affinity to the enzyme glutathione S-transferase (GST) is useful for determining the optimal pH for purification of GST-fusion proteins during GST-affinity chromatography. In this study, GST of the species Schistosoma japonicum was purified, quantified, and utilized to study its binding interaction with GSH at pH 6.5 and 8.5 via isothermal titration calorimetry (ITC). After protein expression, extraction, and purification, the GST concentration was quantified using QubitTM fluorometry. Thermodynamic properties and a dissociation constant (KD) for each experiment were obtained utilizing the MicroCal PEAQ-ITC Analysis Software for the binding of GSH to GST at pH 6.5 and 8.5. Statistical analysis of the technical replicate data was performed to obtain an average and standard deviation of the KD at each pH point. The results indicate a statistically significant difference (p

Keywords

Glutathione; Glutathione S-transferase; Binding affinity; Dissociation constant; pH dependence; Isothermal titration calorimetry; Thermodynamics

Disciplines

Biochemistry

File Format

PDF

File Size

13913

Language

English


Included in

Biochemistry Commons

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