A G-Protein Subunit Translocation Embedded Network Motif Underlies GPCR Regulation of Calcium Oscillations

Giri, Lopamudra and Patel, Anilkumar K. and Karunarathne, W.K. Ajith and et al, . (2014) A G-Protein Subunit Translocation Embedded Network Motif Underlies GPCR Regulation of Calcium Oscillations. Biophysical Journal, 107 (1). pp. 242-254. ISSN 00063495

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G-protein βγ subunits translocate reversibly from the plasma membrane to internal membranes on receptor activation. Translocation rates differ depending on the γ subunit type. There is limited understanding of the role of the differential rates of Gβγ translocation in modulating signaling dynamics in a cell. Bifurcation analysis of the calcium oscillatory network structure predicts that the translocation rate of a signaling protein can regulate the damping of system oscillation. Here, we examined whether the Gβγ translocation rate regulates calcium oscillations induced by G-protein-coupled receptor activation. Oscillations in HeLa cells expressing γ subunit types with different translocation rates were imaged and quantitated. The results show that differential Gβγ translocation rates can underlie the diversity in damping characteristics of calcium oscillations among cells. Mathematical modeling shows that a translocation embedded motif regulates damping of G-protein-mediated calcium oscillations consistent with experimental data. The current study indicates that such a motif may act as a tuning mechanism to design oscillations with varying damping patterns by using intracellular translocation of a signaling component.

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IITH Creators:
IITH CreatorsORCiD
Giri, Lopamudrahttp://orcid.org/0000-0002-2352-7919
Item Type: Article
Subjects: Chemical Engineering
Divisions: Department of Chemical Engineering
Depositing User: Library Staff
Date Deposited: 23 Aug 2019 06:09
Last Modified: 23 Aug 2019 06:09
URI: http://raiith.iith.ac.in/id/eprint/6013
Publisher URL: http://doi.org/10.1016/j.bpj.2014.05.020
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