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Related Experiment Videos

Improved method for screening cDNA expression libraries for DNA-binding proteins.

M C Harline1, J C Kandala, R D Sage

  • 1Department of Molecular Microbiology and Immunology, University of Missouri-Columbia 65212.

Biotechniques
|September 1, 1992
PubMed
Summary
This summary is machine-generated.

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Screening DNA-binding proteins requires highly active radioactive DNA probes. Polymerase Chain Reaction (PCR)-generated probes are superior to Klenow reaction probes for identifying gene products in expression libraries.

Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Screening lambda gt11 cDNA expression libraries for DNA-binding proteins is crucial for understanding gene regulation.
  • The quality of radioactive DNA probes directly impacts the success of library screening.
  • Traditional methods like the Klenow reaction have limitations in probe specific activity.

Purpose of the Study:

  • To compare the efficacy of Polymerase Chain Reaction (PCR)-generated DNA probes versus Klenow reaction probes for screening expression libraries.
  • To demonstrate the superiority of PCR-labeled probes in identifying specific DNA-binding gene products.
  • To facilitate the isolation of recombinant phage encoding DNA-binding proteins.

Main Methods:

  • Generation of double-stranded DNA probes using both PCR labeling and Klenow reaction.

Related Experiment Videos

  • Screening of a lambda gt11 cDNA expression library using radioactive probes.
  • Isolation and characterization of recombinant phage containing specific DNA-binding gene products.

    • Main Results:

    • PCR-generated probes exhibited higher specific activity compared to probes made by the Klenow reaction.
    • The use of PCR probes significantly enhanced the ability to screen the expression library.
    • Successful isolation of recombinant phage encoding DNA-binding proteins that recognize the Rous sarcoma virus long terminal repeat enhancer region.

    Conclusions:

    • PCR-based labeling is a superior method for generating high-specific-activity DNA probes for expression library screening.
    • This method accelerates the identification of DNA-binding proteins.
    • The findings have implications for studying gene regulatory elements like the Rous sarcoma virus enhancer.