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Prophage lambda libraries for isolating cDNA clones by functional screening.

R Mutzel1, A Baeuerle, S Jung

  • 1Fakultät für Biologie, Universität Konstanz, F.R.G.

Gene
|December 15, 1990
PubMed
Summary
This summary is machine-generated.

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This study enhances cDNA clone isolation by expressing proteins in bacterial colonies instead of phage plaques. This improved method, using a lysogen library, significantly increases detection sensitivity for screening, aiding in gene discovery.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Isolation of cDNA clones using lambda gt11 phage libraries is hampered by low fusion protein synthesis in plaques.
  • Enhanced protein expression is achievable in bacterial colonies over phage plaques.

Purpose of the Study:

  • To develop and validate a more sensitive method for isolating cDNA clones.
  • To improve the efficiency of functional and immuno-screening of expression libraries.

Main Methods:

  • Lysogenization of Escherichia coli with a lambda gt11 cDNA expression library from Dictyostelium discoideum.
  • Selection of lysogenic bacteria using lambda cI phage.
  • Immuno-screening and functional screening of the lysogen library with radiolabeled ligands and antibodies.

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Main Results:

  • Successfully isolated cDNA clones for the regulatory subunit of cAMP-dependent protein kinase using antibodies and [3H]cAMP.
  • Demonstrated an order of magnitude lower detection limit for ligand screening with the lysogen library compared to phage libraries.
  • Isolated cDNA clones for calmodulin-binding proteins, which were previously undetectable with phage library screening.

Conclusions:

  • The lysogen library approach significantly enhances the sensitivity of screening for cDNA clones.
  • This method is effective for both immuno-screening and functional screening, enabling the discovery of novel genes.
  • The improved sensitivity facilitates the isolation of low-abundance or difficult-to-detect cDNA clones.