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Updated: Jan 20, 2026

Dissection of Local Ca2+ Signals in Cultured Cells by Membrane-targeted Ca2+ Indicators

Dissection of Local Ca2+ Signals in Cultured Cells by Membrane-targeted Ca2+ Indicators

Published on: March 22, 2019

Positional Information Readout in Ca^{2+} Signaling.

Vaibhav H Wasnik^1,2, Peter Lipp³, Karsten Kruse¹

¹NCCR Chemical Biology, Departments of Biochemistry and Theoretical Physics, University of Geneva, 1211 Geneva, Switzerland.

Physical Review Letters

|September 7, 2019

Summary

This summary is machine-generated.

Cells accurately read positional signals through protein phosphorylation, even with fast calcium diffusion. Kinase membrane binding and increased calcium removal enhance this accuracy, explaining protein kinase Cα behavior.

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Area of Science:

Cellular biology
Biophysics
Biochemistry

Background:

Living cells process spatial signals for physiological responses.
Intracellular signaling relies on second messengers like calcium (Ca^{2+}).
Kinases phosphorylate proteins, mediating signal transduction pathways.

Purpose of the Study:

To theoretically investigate how cells accurately interpret positional information via protein phosphorylation despite rapid Ca^{2+} diffusion.
To identify mechanisms that enhance the accuracy of positional signal readout in cellular signaling.

Main Methods:

Theoretical modeling of intracellular signal transmission.
Analysis of kinase-membrane interactions and Ca^{2+} dynamics.
Mathematical simulation of protein phosphorylation processes.

Main Results:

Cellular accuracy in reading positional information is improved by kinase membrane binding before phosphorylation.
Increased rates of Ca^{2+} efflux from the cell interior enhance signaling accuracy.
These mechanisms offer explanations for observed characteristics of protein kinase Cα.

Conclusions:

Kinase localization to the cell membrane is crucial for precise spatial signal interpretation.
Efficient removal of intracellular Ca^{2+} is vital for accurate signal transduction.
The study provides insights into the regulation of signaling pathways and the behavior of specific kinases like PKCα.