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Related Experiment Videos

Near-membrane iminocoumarin-based low affinity fluorescent Ca(2+) indicators.

F Liepouri1, T G Deligeorgiev, Z Veneti

  • 1Department of Chemistry, University of Crete, Heraklion, 71 409 Crete, Greece.

Cell Calcium
|July 6, 2002
PubMed
Summary

Two novel fluorescent calcium (Ca2+) indicators were developed for near-membrane applications. These probes exhibit the highest Ca2+ dissociation constants reported, enabling sensitive detection of low calcium levels.

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Area of Science:

  • Chemical Biology
  • Molecular Imaging
  • Biochemistry

Background:

  • Accurate measurement of intracellular calcium (Ca2+) is crucial for understanding cellular signaling.
  • Developing sensitive and specific fluorescent probes is essential for monitoring Ca2+ dynamics.
  • Existing probes may have limitations in affinity or localization for specific biological contexts.

Purpose of the Study:

  • To synthesize and characterize novel iminocoumarin-based fluorescent probes for near-membrane calcium (Ca2+) detection.
  • To evaluate the spectral properties and calcium binding characteristics of the new indicators.
  • To assess the potential of these probes as ratiometric indicators for low-affinity Ca2+ sensing.

Main Methods:

  • Synthesis of two iminocoumarin-based fluorescent compounds incorporating BAPTA structures.

Related Experiment Videos

  • Spectroscopic analysis of the free and Ca2+-bound forms of the synthesized probes.
  • Determination of Ca2+ dissociation constants (Kd) and evaluation of spectral shifts upon Ca2+ binding.

    • Main Results:

    • Successful synthesis of two novel near-membrane fluorescent Ca2+ indicators.
    • Probes exhibit high Ca2+ dissociation constant values (5.50 and 4.49 µM), the highest reported to date.
    • Fluorescence spectra show distinct shifts in excitation maxima and intensity changes upon Ca2+ binding, suitable for ratiometric measurements.

    Conclusions:

    • The newly synthesized iminocoumarin-based probes are effective fluorescent indicators for near-membrane Ca2+.
    • Their high Ca2+ dissociation constants make them suitable for detecting low Ca2+ concentrations.
    • These probes offer potential for ratiometric imaging of Ca2+ dynamics in specific cellular compartments.