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A Strategy to Validate the Role of Callose-mediated Plasmodesmal Gating in the Tropic Response

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Modelling auxin efflux carrier phosphorylation and localization.

J A Fozard¹, J R King, M J Bennett

¹Centre for Plant Integrative Biology, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, United Kingdom. john.fozard@nottingham.ac.uk

Journal of Theoretical Biology

|November 20, 2012

Summary

Mathematical modeling reveals how calcium influences PINOID protein regulation of PIN proteins, crucial for plant development and auxin transport. This study enhances understanding of plant hormone signaling pathways.

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Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles

Characterization of Membrane Transporters by Heterologous Expression in E. coli and Production of Membrane Vesicles

Published on: December 31, 2019

Area of Science:

Plant Biology
Molecular Cell Biology
Biophysics

Background:

PIN-FORMED (PIN) proteins regulate auxin efflux, essential for plant development and environmental responses.
The protein kinase PINOID (PID) regulates PIN protein localization and phosphorylation, influencing auxin transport direction.
Calcium signaling and TOUCH3 (TCH3) are implicated in PID internalization following auxin treatment.

Purpose of the Study:

To mathematically model the calcium-dependent regulation of PINOID (PID) protein activity and localization.
To investigate the dynamic behavior of PID in response to transient calcium increases.
To integrate the PID model with a model of PIN protein recycling in polarized cells.

Main Methods:

Development of a mathematical model for PID-TCH3 interaction and calcium dynamics.
Simulation of steady-state and time-dependent behaviors of the model.
Coupling the PID model with a mathematical model for PIN protein recycling in polarized cells.

Main Results:

The model predicts how transient cytosolic calcium increases affect PID localization and activity.
Simulations provide insights into the observed experimental behaviors of PID and PIN proteins.
The integrated model explores the interplay between subcellular PID regulation and PIN recycling.

Conclusions:

Mathematical modeling offers a framework for understanding calcium's role in PID-mediated auxin transport regulation.
The study provides a basis for investigating tissue-level phenomena like gravitropism.
This work bridges subcellular mechanisms with whole-plant physiological processes.