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Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...

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Development of a Fluorescence Polarization Assay for p300/CBP and Its Application Using a Direct-to-Biology Approach.

Jiayin Liang1,2, Ziyi Li3,4, Lu Jin2

  • 1Guangzhou University of Chinese Medicine, Guangdong 510006, China.

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Researchers developed a new fluorescence polarization assay for high-throughput screening of p300/CBP bromodomain inhibitors, accelerating the discovery of potential cancer therapeutics.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Medicinal Chemistry
  • Cancer Research

Background:

  • Histone acetyltransferases p300/CBP are crucial in cancer, making them attractive therapeutic targets.
  • Existing assays lack suitability for high-throughput screening (HTS) of p300/CBP bromodomain inhibitors.
  • A need exists for efficient methods to discover novel small molecules targeting p300/CBP.

Purpose of the Study:

  • To develop a novel, high-throughput fluorescence polarization (FP) assay for screening p300/CBP bromodomain inhibitors.
  • To integrate FP assay development with combinatorial chemistry for rapid compound library screening.
  • To identify and characterize novel small molecule inhibitors of the p300 bromodomain.

Main Methods:

  • Development of a rationally designed fluorescence polarization (FP) assay for p300/CBP bromodomain inhibition.
  • Construction of an 840-compound library using click chemistry (CuAAC reaction) for in situ HTS.
  • Application of computational chemistry for binding mode analysis and cellular studies to assess compound efficacy.

Main Results:

  • Successful implementation of an FP assay suitable for large-scale compound bioactivity evaluation.
  • Rapid identification of potent small molecule inhibitors targeting the p300 bromodomain via in situ HTS.
  • Demonstration of favorable anti-acute myeloid leukemia (AML) properties and H3K27 acetylation modulation by identified compounds.

Conclusions:

  • The developed FP assay platform effectively bridges the gap in discovering p300/CBP bromodomain inhibitors.
  • This integrated approach of FP assay design and combinatorial chemistry accelerates drug discovery for cancer.
  • The identified compounds show promise for targeting AML by modulating p300/CBP activity.