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Protein Dynamics in Living Cells

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FCS experiments to quantify Ca²⁺ diffusion and its interaction with buffers.

Lorena Sigaut¹, Cecilia Villarruel¹, Silvina Ponce Dawson¹

¹Departamento de Física, FCEN-UBA, and IFIBA, CONICET, Ciudad Universitaria, Pabellón I, 1428 Buenos Aires, Argentina.

The Journal of Chemical Physics

|March 17, 2017

Summary

This summary is machine-generated.

This study introduces a new method using Fluorescence Correlation Spectroscopy (FCS) to quantify calcium ion (Ca2+) diffusion and its interactions with cellular buffers. This approach helps understand the complex dynamics of Ca2+ signals in biological systems.

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Area of Science:

Biochemistry and Biophysics
Cell Biology
Physical Chemistry

Background:

Cytosolic calcium ion (Ca2+) signals exhibit diverse spatio-temporal distributions, crucial for cellular functions.
Ca2+ signaling involves extracellular entry and internal store release, modulated by cytosolic Ca2+ itself.
Quantifying Ca2+ diffusion in cells is challenging due to interactions with dyes and intracellular buffers.

Purpose of the Study:

To develop and validate a method for quantifying Ca2+ diffusion and reaction rates with non-fluorescent buffers.
To overcome limitations of optical techniques in measuring Ca2+ transport rates in cellular environments.

Main Methods:

Utilized Fluorescence Correlation Spectroscopy (FCS) experiments under varied conditions.
Developed theoretical framework to interpret FCS data for Ca2+ dynamics.
Applied the method to solutions containing Ca2+, a fluorescent dye, and a non-fluorescent buffer.

Main Results:

Successfully quantified the free diffusion coefficient of Ca2+.
Extracted properties of unobservable (non-fluorescent) Ca2+ buffers.
Demonstrated the feasibility of the approach by analyzing fitting parameters.

Conclusions:

The developed FCS-based approach enables accurate quantification of Ca2+ diffusion and buffer interactions.
This method offers a valuable tool for studying Ca2+ signaling dynamics, applicable to intact cells.
Provides insights into the kinetics affecting Ca2+ signal range and duration.