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Updated: Apr 15, 2026
Kinase Inhibitor Screening In Self-assembled Human Protein Microarrays
Published on: October 23, 2019
'Turn On/Off' fluorescence probe for the screening of unactivated Bruton's tyrosine kinase
Wataru Kawahata1, Tokiko Asami1, Ikuo Fujii2
1Drug Discovery Research, Carna Biosciences, Inc., 3rd Floor, BMA, 1-5-5 Minatojima-Minamimachi, Chuo-ku, Kobe 650-0047, Japan.
Abstract:
BTK has emerged as a promising target for treating B-cell malignancies and autoimmune diseases, and there has been a growing demand to identify selective BTK inhibitors efficiently. In this Letter, we have designed and synthesized a new fluorescent probe to screen compounds that preferentially bind to an unactivated state of BTK (BTK [U]). The fluorescence of the probe was turned on in the presence of BTK [U], and quenched by the addition of compounds which preferentially bind to BTK [U]. This unique fluorescent probe was successfully applied to the screening of a kinase focused compound library. The results suggest that this new method is a simple and easy-to-perform assay to screen inhibitors of BTK [U].
Insights
Researchers developed a novel fluorescent probe to efficiently screen for Bruton's tyrosine kinase (BTK) inhibitors. This probe specifically targets the unactivated state of BTK (BTK [U]), aiding in the discovery of new treatments for B-cell malignancies and autoimmune diseases.
Area of Science:
- Biochemistry
- Chemical Biology
- Drug Discovery
Background:
- Bruton's tyrosine kinase (BTK) is a key target for treating B-cell malignancies and autoimmune diseases.
- There is a significant need for efficient methods to identify selective BTK inhibitors.
- Targeting specific conformational states of BTK, like the unactivated state (BTK [U]), is crucial for developing selective therapies.
Purpose of the Study:
- To design and synthesize a novel fluorescent probe for screening BTK inhibitors.
- To develop a simple and efficient assay for identifying compounds that bind to the unactivated state of BTK (BTK [U]).
Main Methods:
- Design and synthesis of a unique fluorescent probe.
- Utilizing the probe's fluorescence properties to detect BTK [U] binding.
- Application of the probe in screening a focused kinase compound library.
Main Results:
- The fluorescent probe exhibits a 'turn-on' signal in the presence of BTK [U].
- The probe's fluorescence is quenched by compounds that preferentially bind to BTK [U].
- Successful application of the probe in screening a compound library, demonstrating its utility.
Conclusions:
- The developed fluorescent probe is a simple and effective tool for screening inhibitors of BTK [U].
- This method facilitates the identification of selective BTK inhibitors, potentially leading to new therapeutic strategies.
