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Molecular Tension Probe for In Vitro Bioassays
Sung-Bae Kim1, Rika Fujii2, Simon Miller3
1Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan. kimu-sb@aist.go.jp.
Methods in Molecular Biology (Clifton, N.J.)
|July 13, 2022
Summary
This study introduces FRB-A23-FKBP, a novel bioluminescent probe for cell-free bioassays. This probe quantifies molecular tension from protein-protein interactions, enhancing enzymatic activity for versatile bioanalytical applications.
Area of Science:
- Biotechnology
- Molecular Biology
- Bioanalytical Chemistry
Background:
- Cell-free bioassays (CFBs) offer advantages over cell-based bioassays (CBBs), including speed, on-site use, longevity, and versatility.
- Protein-protein interactions (PPIs) are crucial in biological processes and require robust detection methods.
- Previous work introduced a bioluminescent imaging probe for detecting molecular tension in PPIs.
Purpose of the Study:
- To detail the purification and bioanalytical characterization of a novel fusion protein, FRB-A23-FKBP, for use in cell-free bioassays.
- To demonstrate how rapamycin-activated PPIs induce molecular tension, quantitatively enhancing luciferase activity.
- To provide comprehensive protocols for utilizing FRB-A23-FKBP in various CFB conditions.
Main Methods:
- Construction and purification of the FRB-A23-FKBP fusion protein using a three-step column chromatography method.
- Characterization of the fusion protein's bioanalytical utility under different cell-free bioassay conditions.
- Utilizing bioluminescence to quantify molecular tension generated by rapamycin-induced FRB-FKBP interactions.
Main Results:
- The FRB-A23-FKBP fusion protein was successfully purified.
- The probe demonstrated quantitative enhancement of enzymatic activity based on molecular tension from PPIs.
- The utility of FRB-A23-FKBP was validated in diverse cell-free bioassay settings.
Conclusions:
- FRB-A23-FKBP is a versatile tool for cell-free bioassays, enabling quantitative measurement of molecular tension in PPIs.
- The developed protocols facilitate the practical application of this probe in bioanalytical studies.
- This approach advances the capabilities of cell-free bioassays for studying molecular interactions.
