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Dissecting nucleic acid-protein interactions using challenge phage.

Stanley R Maloy1, Jeffrey Gardner

  • 1Department of Biology, Center for Microbial Sciences, San Diego State University, San Diego, CA, USA.

Methods in Enzymology
|March 14, 2007
PubMed
Summary
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The bacteriophage P22 challenge system uses genetic selections to study DNA and RNA interactions in vivo. This tool helps characterize protein-DNA/RNA binding and identify critical residues for these interactions.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • The bacteriophage P22 system offers a genetic method for studying sequence-specific recognition of nucleic acids.
  • Characterizing protein-DNA and protein-RNA interactions in vivo is crucial for understanding gene regulation.

Purpose of the Study:

  • To present the bacteriophage P22-based challenge system as a tool for characterizing in vivo DNA and RNA recognition.
  • To detail how this system facilitates the study of protein-DNA/RNA interactions, including those involving complex protein assemblies.

Main Methods:

  • Utilizes bacteriophage P22 with modifications for positive selection of DNA-binding events.
  • Employs the phage's ant gene to control lysis-lysogeny decisions, enabling selection for or against DNA binding.

Related Experiment Videos

  • Incorporates a kanamycin-resistance marker for selecting lysogeny and quantifying DNA-binding efficiency.

    • Main Results:

    • The challenge phage system allows for strong genetic selections of mutations affecting DNA-protein interaction strength.
    • It enables the isolation of DNA-binding proteins with altered or enhanced specificities.
    • The method has been successfully applied to dissect various prokaryotic and eukaryotic DNA-binding interactions.

    Conclusions:

    • The bacteriophage P22 challenge system is a versatile and powerful genetic tool for in vivo analysis of nucleic acid interactions.
    • It provides a generalizable approach for identifying key residues and regulatory mutations involved in DNA-protein binding.