Related Experiment Video
Updated: Dec 20, 2025
Identification of Mediators of T-cell Receptor Signaling via the Screening of Chemical Inhibitor Libraries
Published on: January 22, 2019
Development and optimization of a cascade of screening assays for inhibitors of TRF2
Tianyue Guo1, Yao Dong1, Yong Chen2
1Jiangsu Key Laboratory of Drug Design and Optimization, Department of Medicinal Chemistry, School of Pharmacy, China Pharmaceutical University, 24 Tongjiaxiang, Nanjing, 210009, PR China.
Abstract:
TRF2 is a telomere associated protein which plays an important role in telomere maintenance. Knockdown of TRF2 can cause chromosomal end to end fusions and induce DNA damage responses. TRF2 exerts its functions partially by recruiting a number of accessory proteins through its TRF homology domain (TRFH), therefore identification of small molecular compounds which can bind to the TRFH domain of TRF2 and block the interactions of TRF2 with its associated proteins is important to elucidate the molecular mechanism of these protein-protein interactions. Development of robust and sensitive screening and evaluation assays is critical to the identification of TRF2 inhibitors, in this paper we reported the development and optimization of a cascade of screening and binding affinity evaluation assays, including a competitive FP (Fluorescence Polarization) assay utilized in our previous research, and two novel label-free DSF (Differential Scanning Fluorescence) and BLI (Biolayer Interferometry) assays. A previously identified TRF2 inhibitor TRF2-27 was used as an internal reference compound and evaluated in all of these assays. According to the results, DSF assay is not suitable for TRF2 screening because of the low ΔTm, while the optimized labeled-free BLI assay was demonstrated to be an accurate and reproducible assay for TRF2 inhibitor screening and characterization.
Insights
Identifying small molecules that inhibit telomere-associated protein TRF2 (Telomere Repeat-Binding Factor 2) is crucial. A label-free Biolayer Interferometry (BLI) assay proved accurate and reproducible for screening TRF2 inhibitors.
Area of Science:
- Molecular Biology
- Biochemistry
- Drug Discovery
Background:
- Telomere Repeat-Binding Factor 2 (TRF2) is vital for telomere maintenance.
- TRF2 dysfunction leads to chromosomal instability and DNA damage.
- Targeting TRF2's TRF homology domain (TRFH) with small molecules can elucidate protein-protein interactions.
Purpose of the Study:
- To develop and optimize screening assays for identifying TRF2 inhibitors.
- To evaluate the suitability of Fluorescence Polarization (FP), Differential Scanning Fluorescence (DSF), and Biolayer Interferometry (BLI) assays for TRF2 inhibitor screening.
Main Methods:
- Development of a cascade of screening and binding affinity evaluation assays.
- Utilized a competitive Fluorescence Polarization (FP) assay.
- Developed novel label-free Differential Scanning Fluorescence (DSF) and Biolayer Interferometry (BLI) assays.
- Evaluated a known TRF2 inhibitor (TRF2-27) as a reference.
Main Results:
- Differential Scanning Fluorescence (DSF) assay showed low ΔTm, rendering it unsuitable for TRF2 screening.
- The optimized label-free Biolayer Interferometry (BLI) assay demonstrated accuracy and reproducibility.
- TRF2-27 was successfully evaluated across all tested assays.
Conclusions:
- The label-free Biolayer Interferometry (BLI) assay is a robust method for TRF2 inhibitor screening and characterization.
- Optimized assays are critical for identifying compounds that modulate TRF2 function.
- Further research into TRF2 inhibitors can advance understanding of telomere biology and DNA damage response.
