Abstract
We present a novel method, termed competitive fluorescent ligand assay for inositol 1,4,5-trisphosphate (CFLA-IP3), to measure inositol 1,4,5-trisphosphate (IP3). This method is based on fluorescence resonance energy transfer (FRET) between two fluorescent molecules, a fluorescent IP3-binding protein and its fluorescent ligand. Binding of these fluorescent molecules generates a FRET signal, and the IP3-dependent decrease in the FRET signal due to displacement of the fluorescent ligand is detected by fluorescence microscopy.
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