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The Two-State Receptor Model01:29

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The two-state receptor model explains a drug's interaction with receptors, such as G protein-coupled receptors and ligand-gated ion channels, to induce or inhibit a biological response. When no natural ligands are present, a receptor exists in an equilibrium of inactive (Ri) and active (Ra) conformations. The inactive form does not produce a response, while the active form generates a basal effect known as constitutive activity.
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Some receptors remain unoccupied even when an agonist produces a maximal response. Such empty ones are called spare receptors. In presence of spare receptors the maximum effect of an agonist drug is achieved with fewer than 100% of the receptors being occupied. To determine the presence of spare receptors, scientists often compare the concentration of the drug needed to produce 50% of the maximum effect (EC50) with the concentration of the drug needed to occupy 50% of the receptors (Kd). If the...
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Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
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Related Experiment Video

Updated: Apr 1, 2026

Exploring Sequence Space to Identify Binding Sites for Regulatory RNA-Binding Proteins
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Introducing a static receptor to compete with a dynamic combinatorial library in template binding.

Filip Ulatowski1, Dawid Lichosyt, Janusz Jurczak

  • 1Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52 01-224, Warsaw, Poland. janusz.jurczak@icho.edu.pl.

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|October 1, 2015
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Summary

This study introduces a method to determine binding strength by creating a competition between a static receptor and dynamic combinatorial libraries. This approach allows for accurate measurement of association constants using high-performance liquid chromatography (HPLC).

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Area of Science:

  • Chemical sciences
  • Analytical chemistry
  • Supramolecular chemistry

Background:

  • Dynamic combinatorial chemistry (DCC) enables the creation of complex molecular libraries.
  • Measuring binding affinities in dynamic systems presents analytical challenges.

Purpose of the Study:

  • To develop a novel method for determining association constants.
  • To utilize competition between static receptors and dynamic combinatorial libraries for equilibrium analysis.

Main Methods:

  • Employing high-performance liquid chromatography (HPLC) for analysis.
  • Freezing the equilibrium of a dynamic combinatorial library (DCL) in competition with a static receptor.
  • Utilizing a selected template for binding interactions.

Main Results:

  • Successfully determined association constants through competition assays.
  • Demonstrated the efficacy of HPLC in analyzing frozen equilibria.
  • Validated the principle of using DCLs and static receptors for binding studies.

Conclusions:

  • The developed method provides a robust way to quantify molecular interactions.
  • Competition assays with DCLs offer a powerful tool in supramolecular chemistry.
  • This technique enhances the characterization of binding events in dynamic systems.