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Related Experiment Videos

Homogeneous fluorescence assay for cyclic AMP.

Ewa Heyduk1, Ying Fei, Tomasz Heyduk

  • 1Saint Louis University School of Medicine, E.A. Doisy Department of Biochemistry and Molecular Biology, 1402 S. Grand Blvd., St. Louis, MO 63104, USA.

Combinatorial Chemistry & High Throughput Screening
|May 29, 2003
PubMed
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A new homogeneous fluorescence assay was developed to measure cyclic adenosine monophosphate (cAMP) concentrations. This assay utilizes the cAMP-dependent DNA binding activity of the CAP protein, offering a sensitive method for biological samples.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Assay Development

Background:

  • Cyclic adenosine monophosphate (cAMP) is a crucial second messenger involved in numerous cellular processes.
  • Existing methods for cAMP measurement can be complex or lack sensitivity.
  • A novel approach is needed for efficient and accurate cAMP quantification.

Purpose of the Study:

  • To develop a homogeneous fluorescence assay for determining cAMP concentrations.
  • To utilize ligand-dependent DNA binding proteins as sensors for their respective ligands.
  • To establish a sensitive and reproducible assay for biological samples.

Main Methods:

  • Developed a homogeneous fluorescence assay using the CAP protein, a cAMP-dependent DNA binding protein.
  • Employed a fluorescence assay for DNA binding proteins to detect cAMP-dependent CAP-DNA complex formation.

Related Experiment Videos

  • Optimized the assay for 96-well and 384-well microplate formats for low nanomolar cAMP detection.

    • Main Results:

    • The assay demonstrated excellent reproducibility in fluorescence signal change correlated with cAMP concentration.
    • Successfully detected cAMP in cellular extracts from forskolin-stimulated HEK 293 cells.
    • Validated the homogeneous assay for measuring cAMP based on cAMP-dependent DNA binding activity of CAP protein.

    Conclusions:

    • The developed homogeneous fluorescence assay provides a sensitive and reproducible method for cAMP measurement.
    • The assay design, based on ligand-dependent DNA binding proteins, is adaptable for developing assays for other ligands.
    • This novel assay has potential applications in various biological research areas requiring cAMP quantification.