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Updated: May 4, 2026
Time-resolved Förster Resonance Energy Transfer Assays for Measurement of Endogenous Phosphorylated STAT Proteins in Human Cells
Published on: September 9, 2021
Electrochemical detection of the Fc-STAT3 phosphorylation and STAT3-Fc-STAT3 dimerization and inhibition
S Martic1, M K Rains, S Haftchenary
1Department of Chemistry, Oakland University, 2200 North Squirrel Road, Rochester, Michigan, USA 48309. martic@oakland.edu.
Abstract:
Signal transducer and activator of transcription 3 (STAT3) protein is involved in regulatory functions in cell proliferation, differentiation and survival, and is linked to cancer phenotype and tumorigenesis. Towards developing new methodologies for screening STAT3 interactions, the electrochemical method based on the use of redox active protein was proposed. The electrochemical signal, due to the redox (ferrocene)-labeled STAT3 protein immobilized on a gold surface, was modulated due to protein dimerization with the unlabeled STAT3 molecule. The dramatic decrease in current density from 2.7 μA cm(-2) to 0.5 μA cm(-2) was observed following the STAT3-ferrocene-STAT3 dimerization. The electrochemical approach was further extended for screening the potential dimerization inhibitors. Previously published potent salicylic acid derivatives were the most promising candidates for inhibition of STAT3 dimerization in this assay. We expect that other SH2-containing proteins may be monitored by the proposed electrochemical method.
Insights
A new electrochemical method detects Signal transducer and activator of transcription 3 (STAT3) dimerization, a key process in cancer. This assay effectively screens for STAT3 dimerization inhibitors, identifying salicylic acid derivatives as promising candidates.
Area of Science:
- Biochemistry
- Electrochemical biosensing
- Cancer biology
Background:
- Signal transducer and activator of transcription 3 (STAT3) is crucial for cell regulation and implicated in cancer.
- Developing sensitive methods to screen STAT3 interactions is vital for cancer research and drug discovery.
Purpose of the Study:
- To develop a novel electrochemical method for detecting STAT3 protein dimerization.
- To utilize this method for screening potential inhibitors of STAT3 dimerization.
Main Methods:
- Immobilization of redox (ferrocene)-labeled STAT3 protein on a gold surface.
- Monitoring changes in electrochemical signal (current density) upon STAT3 dimerization.
- Assessing the inhibitory effects of compounds on STAT3 dimerization.
Main Results:
- A significant decrease in current density was observed upon STAT3 dimerization (from 2.7 μA cm(-2) to 0.5 μA cm(-2)).
- The electrochemical method successfully screened for STAT3 dimerization inhibitors.
- Potent salicylic acid derivatives demonstrated significant inhibition of STAT3 dimerization.
Conclusions:
- The proposed electrochemical method offers a sensitive and effective approach for monitoring STAT3 dimerization.
- This assay is valuable for high-throughput screening of STAT3 dimerization inhibitors.
- The method holds potential for analyzing other SH2-containing proteins.
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