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Related Experiment Videos

Selection of high-affinity binding sites for sequence-specific, DNA binding proteins from random sequence

S Pierrou1, S Enerbäck, P Carlsson

  • 1Department of Molecular Biology, Göteborg University, Sweden.

Analytical Biochemistry
|July 20, 1995
PubMed
Summary

This study presents a fast method to find DNA binding sites for specific proteins. The technique uses bacterial expression and DNA selection to identify high-affinity binding sequences efficiently.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Sequence-specific DNA binding proteins play crucial roles in gene regulation.
  • Identifying the specific DNA sequences recognized by these proteins is essential for understanding their function.
  • Existing methods for DNA-binding site identification can be time-consuming and labor-intensive.

Purpose of the Study:

  • To develop a rapid and sensitive method for isolating high-affinity DNA binding sites.
  • To provide a versatile technique applicable to various sequence-specific DNA binding proteins.
  • To facilitate the study of protein-DNA interactions in molecular biology.

Main Methods:

  • Expressing the DNA binding domain of a target protein fused to glutathione S-transferase (GST) in Escherichia coli.

Related Experiment Videos

  • Performing binding reactions with randomized oligonucleotides under stringent conditions (high poly(dI:C) levels).
  • Isolating GST-fusion proteins using glutathione-Sepharose, followed by polymerase chain reaction (PCR) amplification of bound DNA and iterative selection.

    • Main Results:

    • Achieving a pure population of high-affinity binding sites after approximately five cycles of selection and amplification.
    • Successful identification and sequencing of specific DNA binding sequences.
    • Demonstrating the method's efficiency in isolating target DNA sequences.

    Conclusions:

    • The described method is rapid and sensitive for isolating high-affinity DNA binding sites.
    • The technique is broadly applicable to any sequence-specific DNA binding protein expressible in bacteria.
    • This approach offers a valuable tool for molecular biologists studying protein-DNA interactions and gene regulation.