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Affinity Chromatography01:03

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Affinity chromatography is a powerful technique extensively utilized for separating and purifying specific biomolecules from complex mixtures. It capitalizes on the highly selective binding between an analyte and its counterpart, such as antibody-antigen interactions. The counterpart is immobilized on the stationary phase, forming an affinity column. The stationary phase typically consists of solid support, such as agarose or porous glass beads, immobilizing the affinity ligand. The mobile...
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Proteins are dynamic macromolecules that carry out a wide variety of essential processes; however, the activities of most proteins depend on their interactions with other molecules or ions, known as ligands.
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Some compounds produce hydroxide ions when dissolved by chemically reacting with water molecules. In all cases, these compounds react only partially and so are classified as weak bases. These types of compounds are also abundant in nature and important commodities in various technologies. For example, global production of the weak base ammonia is typically well over 100 metric tons annually, being widely used as an agricultural fertilizer, a raw material for chemical synthesis of other...
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Few compounds act as strong acids. A far greater number of compounds behave as weak acids and only partially react with water, leaving a large majority of dissolved molecules in their original form and generating a relatively small amount of hydronium ions. Weak acids are commonly encountered in nature, being the substances partly responsible for the tangy taste of citrus fruits, the stinging sensation of insect bites, and the unpleasant smells associated with body odor. A familiar example of a...
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Monolith weak affinity chromatography for μg-protein-ligand interaction study.

Lucile Lecas1, Jérôme Randon1, Alain Berthod1

  • 1Université de Lyon, CNRS, Université Claude Bernard Lyon 1, Institut des Sciences Analytiques, UMR 5280, 5 rue de la Doua, F-69100, Villeurbanne, France.

Journal of Pharmaceutical and Biomedical Analysis
|January 18, 2019
PubMed
Summary

New affinity monolith columns enable rapid protein-ligand interaction studies using minimal sample. The streptavidin-biotin method on organic supports offers superior protein immobilization and activity for accurate affinity measurements.

Keywords:
HSAHSP90MiniaturizationMonolithsProtein-ligand interactionWeak affinity chromatography

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Area of Science:

  • Biochemistry and Analytical Chemistry
  • Chromatography and Separation Science
  • Biomolecular Interaction Analysis

Background:

  • Investigating protein-ligand interactions is crucial for drug discovery and understanding biological processes.
  • Traditional methods often require large amounts of purified proteins and can be time-consuming.
  • Developing efficient and sensitive methods for affinity chromatography is essential for high-throughput screening.

Purpose of the Study:

  • To develop novel affinity monolith columns for efficient protein-ligand affinity investigations.
  • To compare different monolithic supports and bio-functionalization strategies for optimal protein immobilization.
  • To validate the developed method for accurate determination of binding affinities (Kd values).

Main Methods:

  • In-situ synthesis of silica and glycidylmethacrylate based monoliths.
  • Grafting of human serum albumin (HSA) using epoxy-amine, Schiff Base, and streptavidin-biotin methods.
  • Evaluation using frontal analysis on a capillary electrophoresis instrument with an external pressure device.

Main Results:

  • Organic monoliths with the streptavidin-biotin approach yielded the highest active protein content (40 pmol HSA/column) with minimal non-specific interactions (<10%) and high protein activity (84%).
  • The immobilization process was rapid (10 min), UV-monitored, and automated, requiring only 3 μg of HSA.
  • Validated Kd measurements for three known HSA ligands and demonstrated applicability to the HSP90 protein domain.

Conclusions:

  • Affinity monolith columns, particularly organic ones utilizing the streptavidin-biotin strategy, provide a highly efficient platform for protein-ligand interaction studies.
  • The method allows for automated, low-pressure chromatography with minimal reagent consumption and high sensitivity.
  • This technique is robust, reproducible, and applicable to various proteins of pharmaceutical interest, with stable columns storable for up to 3 months.