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Protein-Drug Binding: Determination Methods01:22

Protein-Drug Binding: Determination Methods

Determining protein-drug binding can be achieved through indirect and direct methods, each providing valuable insights into the interaction between proteins and drugs.
Indirect methods involve isolating the bound drug from its free form in biological samples such as blood, serum, or plasma. These techniques aim to measure the percentage of drugs bound to proteins. Equilibrium dialysis is a commonly used method where the free drug concentration at equilibrium is measured by separating the bound...

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Related Experiment Video

Updated: May 7, 2026

High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy
06:38

High Sensitivity Measurement of Transcription Factor-DNA Binding Affinities by Competitive Titration Using Fluorescence Microscopy

Published on: February 7, 2019

High-throughput analysis of protein-DNA binding affinity.

José M Franco-Zorrilla1, Roberto Solano

  • 1Genomics Unit, Centro Nacional de Biotecnología-CSIC, Madrid, Spain.

Methods in Molecular Biology (Clifton, N.J.)
|September 24, 2013
PubMed
Summary

Protein-binding microarrays (PBMs) provide a high-throughput method to identify DNA motifs recognized by transcription factors (TFs). This approach overcomes limitations of older techniques, enabling comprehensive analysis of TF DNA-binding specificities.

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Last Updated: May 7, 2026

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Sequence-specific protein-DNA interactions are crucial for gene expression regulation.
  • Traditional methods for determining transcription factor (TF) DNA-binding specificities are low-throughput and may miss biologically relevant motifs.
  • High-throughput methods are needed to comprehensively characterize TF DNA-binding specificities.

Purpose of the Study:

  • To describe the detailed procedures for using protein-binding microarrays (PBMs) for high-throughput identification of TF DNA-binding specificities.
  • To provide a method for identifying DNA motifs recognized by TFs, including those with lower affinity.
  • To facilitate the comprehensive analysis of TF DNA-binding specificities.

Main Methods:

  • Utilizing protein-binding microarrays (PBMs) containing all possible 10- or 11-mer DNA sequences.
  • Synthesizing single-stranded DNA PBMs and converting them to double-stranded form via primer extension.
  • Incubating PBMs with epitope-tagged recombinant proteins and detecting DNA-protein complexes using immunological reactions and fluorophores.

Main Results:

  • PBMs enable the determination of DNA-binding specificities for a wide range of eukaryotic TFs.
  • Specific DNA motifs recognized by proteins are identified using ready-to-use scripts after PBM scanning and quantification.
  • This method generates comprehensive and accessible information on protein-DNA binding specificities.

Conclusions:

  • Protein-binding microarrays (PBMs) offer a powerful high-throughput alternative to traditional methods for characterizing TF DNA-binding specificities.
  • The described PBM protocol allows for detailed analysis of DNA motifs, including those with lower binding affinities.
  • This approach enhances our understanding of gene regulation by providing comprehensive insights into protein-DNA interactions.