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Active concentration measurements of recombinant biomolecules using biosensor technology
G Zeder-Lutz1, A Benito, M H Van Regenmortel
1Immunochemistry Laboratory (UPR 9021), Institut de Biologie Moléculaire et Cellulaire du CNRS, 15 rue Descartes, 67084 Strasbourg Cedex, France.
Journal of Molecular Recognition : JMR
|November 11, 1999
Summary
The active concentration of biomolecules, crucial for biological function, is often much lower than total concentration. Measuring active concentration accurately is vital to avoid misinterpreting protein behavior and experimental results.
Area of Science:
- Biochemistry
- Biophysics
- Analytical Chemistry
Background:
- Biomolecule concentration is typically measured as total substance per volume.
- Biologically active concentration, reflecting specific ligand interaction, is more relevant for protein studies.
- Conventional methods may not accurately represent the functional concentration of biomolecules.
Purpose of the Study:
- To introduce a biosensor-based method for measuring the active concentration of biomolecules.
- To highlight the discrepancy between active and nominal concentrations of recombinant proteins.
- To emphasize the importance of active concentration for accurate biological interpretation.
Main Methods:
- Utilizing a biosensor instrument to inject biomolecule preparations at varying flow rates onto a ligand-presenting sensor chip.
- Operating under conditions of partial mass transport limitation.
- Avoiding the need for pre-established standard curves.
Main Results:
- Active concentration of tested recombinant proteins was significantly lower than nominal concentration.
- Active concentration values were dependent on the specific ligand used in the binding assay.
- The method demonstrated utility without requiring a standard curve.
Conclusions:
- Active concentration is a ligand-dependent parameter and crucial for understanding biomolecule function.
- Discrepancies between active and nominal concentrations can lead to erroneous conclusions in biological assays.
- The developed biosensor method provides a reliable way to measure biologically relevant active concentrations.