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BODIPY-Based Fluorescent Probes for Sensing Protein Surface-Hydrophobicity
Nethaniah Dorh1, Shilei Zhu1, Kamal B Dhungana2
1Department of Chemistry, Michigan Technological University, Houghton, MI 49931, USA.
Scientific Reports
|December 19, 2015
Summary
New BODIPY-based hydrophobic sensors offer enhanced detection of protein surface hydrophobicity. These sensors provide a stronger signal than traditional probes, aiding in understanding protein interactions and diseases.
Area of Science:
- Biochemistry
- Biophysics
- Chemical Biology
Background:
- Surface hydrophobic interactions are crucial for protein recognition and function.
- Protein misfolding diseases are linked to altered hydrophobic properties.
- Existing hydrophobic probes like ANS have limitations in sensitivity.
Purpose of the Study:
- To develop novel, highly fluorescent BODIPY-based hydrophobic sensors (HPsensors).
- To evaluate the efficacy of HPsensors for measuring protein surface hydrophobicity.
- To elucidate the mechanism behind the enhanced fluorescence signal.
Main Methods:
- Synthesis of new BODIPY-based hydrophobic sensors.
- Fluorescence spectroscopy to measure protein surface hydrophobicity.
- Comparison with a standard hydrophobic probe (ANS).
- First-principles calculations to understand fluorescence enhancement.
Main Results:
- HPsensors exhibit high stability and fluorescence across pH 7.0-9.0.
- Significantly stronger fluorescence signals compared to ANS for proteins like BSA, apomyoglobin, and myoglobin.
- Demonstrated nanomolar affinity for BSA, indicating high sensitivity.
- Identified increased molecular rigidity and conformational changes of the dye upon protein interaction.
Conclusions:
- BODIPY-based HPsensors are sensitive and effective tools for mapping protein surface hydrophobicity.
- These sensors offer superior performance over traditional probes.
- The enhanced signal is attributed to dye rigidity and conformational changes induced by hydrophobic interactions.
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