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Colocalization of proteins that are part of the same signal transduction pathway via compartmentalization, scaffold, or anchor proteins is an essential aspect of the signal transduction system in eukaryotic cells. If interaction must occur via free diffusion, then the spatial separation between the sources of the two interacting proteins and their degradation rates become primary determinants of the time required for interaction. To understand the role of such colocalization, we create a mathematical model of the diffusion based protein–protein interaction process. We assume that mRNAs, which serve as the sources of these proteins, are located at different positions in the cytoplasm. For large cells such as Drosophila oocytes we show that if the source mRNAs were at random locations in the cell rather than colocalized, the average rate of interactions would be extremely small, which suggests that localization is needed to facilitate protein interactions and not just to prevent cross-talk between different signaling modules.
Copyright 2004 National Academy of Sciences.
protein diffusion, protein mobility, intracellular reaction, protein localization
Batada, N. N., Shepp, L. A., & Siegmund, D. O. (2004). Stochastic Model of Protein–Protein Interaction: Why Signaling Proteins Need to Be Colocalized. PNAS, 101 (17), 6445-6449. http://dx.doi.org/10.1073/pnas.0401314101
Date Posted: 27 November 2017
This document has been peer reviewed.