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Fluorescent Nanoparticles for the Measurement of Ion Concentration in Biological Systems
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A new fluorescent biosensor for inositol trisphosphate.

Takashi Morii1, Kenji Sugimoto, Keisuke Makino

  • 1Institute of Advanced Energy, Kyoto University, PRESTO, Japan Science and Technology Corporation, Uji, Kyoto 611-0011, Japan.

Journal of the American Chemical Society
|February 14, 2002
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Researchers developed a novel protein sensor for d-myo-inositol-1,4,5-trisphosphate (IP3), a key signaling molecule. This sensor offers improved IP3 detection with enhanced fluorescence and selectivity for cellular calcium concentration studies.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cell Signaling

Background:

  • D-myo-inositol-1,4,5-trisphosphate (IP3) is a critical intracellular second messenger regulating cellular calcium (Ca2+) levels.
  • Accurate detection and quantification of IP3 are essential for understanding cellular signaling pathways.

Purpose of the Study:

  • To engineer a functionalized protein-based sensor for detecting IP3.
  • To leverage the selective IP3 binding properties of the pleckstrin homology (PH) domain for sensor development.

Main Methods:

  • Utilized the inherent IP3 binding capability of the PH domain.
  • Introduced cysteine mutations in proximal residues.
  • Alkylated the active site with fluorophore derivatives to create a signaling mechanism.

Main Results:

  • Developed a functionalized protein sensor with micromolar affinity for IP3.
  • Achieved reasonably strong fluorescence emission with detectable wavelength shifts upon IP3 binding.
  • Demonstrated enhanced selectivity for IP3 over other inositol phosphate derivatives compared to the original PH domain.

Conclusions:

  • The engineered protein sensor provides a sensitive and selective tool for IP3 detection.
  • This novel sensor facilitates the study of cellular Ca2+ regulation and signaling pathways involving IP3.