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An autosampling differential scanning calorimeter instrument for studying molecular interactions
Valerian Plotnikov1, Andrew Rochalski, Michael Brandts
1MicroCal, LLC, Northampton, MA, USA.
Assay and Drug Development Technologies
|April 20, 2004
Summary
A new differential scanning calorimeter (DSC) enables high-throughput screening of drug candidates and protein stability. This ultrasensitive instrument accurately measures binding constants for pharmaceutical applications.
Area of Science:
- Biophysical Chemistry
- Analytical Chemistry
- Pharmaceutical Science
Background:
- Differential Scanning Calorimetry (DSC) is a valuable technique for characterizing biomolecular interactions.
- High-throughput screening is crucial in pharmaceutical development for identifying drug candidates and optimizing formulations.
- Accurate determination of binding constants is essential for understanding drug-target interactions and formulation stability.
Purpose of the Study:
- To introduce a novel ultrasensitive differential scanning calorimeter (DSC) instrument with autosampling capabilities.
- To demonstrate the instrument's suitability for high-throughput screening in pharmaceutical applications.
- To present the measurement of binding constants for anionic inhibitors to ribonuclease A using the new DSC instrument.
Main Methods:
- Development and implementation of an ultrasensitive DSC instrument with automated sample handling.
- High scanning rates (up to 250 deg/h) and rapid equilibration for increased sample throughput.
- Measurement of thermal unfolding transition temperatures (T(M)) of ribonuclease A in the presence and absence of various anionic inhibitors.
Main Results:
- The DSC instrument achieved a sample throughput of up to 50 samples per 24 hours of unattended operation.
- Binding constants (K(B)) were determined for five anionic inhibitors, ranging from 155 M⁻¹ (phosphate) to 13100 M⁻¹ (2'-CMP).
- The results demonstrate the DSC method's capability to accurately quantify ligand-protein binding interactions.
Conclusions:
- The new ultrasensitive DSC instrument significantly enhances sample throughput for biophysical characterization.
- This technology is well-suited for pharmaceutical applications requiring rapid screening of drug candidates and formulation stability.
- The DSC method is versatile and can be extended to analyze ultratight binding interactions in various biological systems.