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An improved Ras sensor for highly sensitive and quantitative FRET-FLIM imaging
Ana F Oliveira1, Ryohei Yasuda
1Department of Neurobiology, Duke University Medical Center, Durham, North Carolina, United States of America.
Plos One
|January 26, 2013
Summary
Researchers developed new Ras signaling sensors (FRas2-F and FRas2-M) with improved sensitivity for studying cellular functions. These advanced tools enhance the spatiotemporal resolution of Ras activity measurements in cells and neurons.
Area of Science:
- Cell Biology
- Molecular Biology
- Biophysics
Background:
- Ras signaling pathways regulate critical cellular processes.
- Accurate measurement of Ras activity is vital for understanding cell function.
- Existing FRET-based sensors (FRas, FRas-F) have sensitivity limitations due to acceptor localization.
Purpose of the Study:
- To overcome the sensitivity limitations of previous Ras sensors.
- To develop enhanced Ras activity sensors with improved performance.
- To enable higher spatiotemporal resolution of Ras signaling dynamics.
Main Methods:
- Development of two new Förster resonance energy transfer (FRET)-based Ras sensors: FRas2-F and FRas2-M, with distinct affinities.
- Utilizing 2-photon fluorescence lifetime imaging microscopy (2p-FLIM).
- Testing sensor performance in 293T cells and primary neurons.
Main Results:
- The novel FRas2 sensors exhibit higher sensitivity compared to prior FRas sensors.
- FRas2-F has a K(d) of approximately 1.7 µM, and FRas2-M has a K(d) of approximately 0.5 µM.
- Enhanced signal detection was observed in both cell lines and neurons.
Conclusions:
- The developed FRas2 sensors offer superior sensitivity for monitoring Ras signaling.
- These improved sensors facilitate more precise spatiotemporal analysis of Ras activity.
- The findings advance the study of Ras-mediated cellular functions.
