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Spatiotemporal Control of Protein Activity through Optogenetic Allosteric Regulation
Published on: October 4, 2024
Oscillations in intracellular signaling cascades
K-H Chiam1, Gunaretnam Rajagopal
1Institute of High Performance Computing, 1 Science Park Road, Singapore 117528, Singapore. chiamkh@mailaps.org
Summary
Intracellular signaling cascades require at least three layers to synchronize protein kinase oscillations. This depth ensures uniform distribution and maintains signaling fidelity, even with crosstalk between parallel cascades.
Area of Science:
- Cellular dynamics
- Biochemical signaling pathways
Background:
- Intracellular signaling cascades are crucial for cellular communication.
- Understanding the dynamics of these cascades is essential for deciphering cellular responses.
Purpose of the Study:
- To investigate the oscillatory dynamics of intracellular signaling cascades.
- To determine the role of cascade depth in generating and maintaining oscillations.
- To analyze the impact of crosstalk between parallel cascades on signaling fidelity.
Main Methods:
- Derivation of a reaction-diffusion model for the mitogen-activated protein kinase cascade.
- Mathematical analysis of oscillatory instabilities as a function of cascade depth.
- Simulation of spatially uniform oscillatory behavior and its synchronization effect.
- Assessment of perturbations due to parallel cascade crosstalk.
Main Results:
- Oscillatory instabilities in protein kinase concentrations occur only in cascades of three or more layers.
- Oscillatory instability is spatially uniform, leading to synchronized and uniformly distributed protein kinase concentrations.
- Crosstalk between parallel cascades perturbs upstream layers more than downstream layers.
- Three-layer cascades maintain signaling activity power close to unperturbed levels.
Conclusions:
- Cascades of at least three layers are necessary for synchronized protein kinase oscillations in the cytosol.
- These deeper cascades maintain signaling fidelity despite parallel crosstalk.
- The findings suggest a design principle for robust intracellular signaling.
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