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Related Concept Videos

Protein-Drug Binding: Mechanism and Kinetics01:16

Protein-Drug Binding: Mechanism and Kinetics

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Protein-drug binding refers to the interaction between drugs and proteins within the body. This binding process can occur intracellularly, involving drug interactions with enzymes or receptors within cells, or extracellularly, involving plasma proteins in the blood.
Various forces drive these interactions, including hydrogen bonds, hydrophobic interactions, ionic bonds, electrostatic interactions, and van der Waals forces. These bonds enable drugs to bind to specific sites on proteins,...
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In vitro experiments are crucial for understanding the transport and absorption of drugs through biological materials. These studies employ varied methods such as the diffusion cell method, the everted sac technique, and the everted ring technique.
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In situ experiments, such as the Doluisio method and Single-Pass Perfusion technique, provide critical insights into drug uptake by simulating in vivo conditions for drug absorption.
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Affinity and Avidity

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Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
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Related Experiment Video

Updated: Jul 26, 2025

Expression of Exogenous Antigens in the Mycobacterium bovis BCG Vaccine via Non-genetic Surface Decoration with the Avidin-biotin System
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The avidin-theophylline complex: A structural and computational study.

Angelo Spinello1, Fabio Lapenta2, Matteo De March2,3

  • 1Department of Biological, Chemical and Pharmaceutical Sciences and Technologies, University of Palermo, Palermo, Italy.

Proteins
|June 15, 2023
PubMed
Summary

Avidin binds the asthma drug theophylline (TEP) in its biotin-binding pocket. Molecular simulations reveal how avidin interacts with TEP, offering insights into protein-ligand binding thermodynamics.

Keywords:
avidin complexbinding constantcrystal structurefree-energyxanthine

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Area of Science:

  • Biochemistry
  • Structural Biology
  • Molecular Interactions

Background:

  • Avidin-biotin interaction is crucial in biology, but avidin's binding pocket can accommodate non-biotinylated ligands.
  • Understanding factors differentiating strong biotin binding from weaker interactions with other molecules is key to characterizing protein-ligand thermodynamics.

Purpose of the Study:

  • To investigate the binding of theophylline (TEP), an asthma therapeutic, to chicken white egg avidin.
  • To elucidate the molecular interactions governing the avidin-TEP complex and compare them to avidin-biotin and avidin-nucleoside complexes.

Main Methods:

  • X-ray crystallography to determine the structure of the avidin-TEP complex.
  • Isothermal titration calorimetry (ITC) to measure the binding affinity of TEP to avidin.
  • Molecular dynamic (MD) simulations to analyze intermolecular interactions within the binding pocket.

Main Results:

  • The crystal structure shows TEP occupying the biotin-binding pocket with similar orientation and planarity to 8-oxodeoxyguanosine.
  • Isothermal titration calorimetry revealed a binding affinity for avidin-TEP in the micromolar (μM) range, comparable to nucleoside derivatives.
  • Molecular dynamic simulations provided insights into key intermolecular interactions in the avidin-TEP complex, contrasting with avidin-biotin and avidin-8-oxodeoxyguanosine complexes.

Conclusions:

  • Avidin demonstrates a capacity to complex with purely aromatic molecules like theophylline.
  • The study enhances the understanding of avidin's binding promiscuity and the thermodynamics of low-affinity protein-ligand interactions.