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

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Title A G-Protein Subunit Translocation Embedded Network Motif Underlies GPCR Regulation of Calcium Oscillations
 
Creator GIRI, L
PATEL, AK
KARUNARATHNE, WKA
KALYANARAMAN, V
VENKATESH, KV
GAUTAM, N
 
Subject RECEPTOR ACTIVATION
CELL
DYNAMICS
MEMBRANE
SWITCH
VARIABILITY
SIGNALS
FAMILY
SPACE
TIME
 
Description G-protein beta gamma subunits translocate reversibly from the plasma membrane to internal membranes on receptor activation. Translocation rates differ depending on the gamma subunit type. There is limited understanding of the role of the differential rates of G(beta gamma) 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 G(beta gamma) translocation rate regulates calcium oscillations induced by G-protein-coupled receptor activation. Oscillations in HeLa cells expressing gamma subunit types with different translocation rates were imaged and quantitated. The results show that differential G(beta gamma) 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.
 
Publisher CELL PRESS
 
Date 2014-12-28T13:02:54Z
2014-12-28T13:02:54Z
2014
 
Type Article
 
Identifier BIOPHYSICAL JOURNAL, 107(1)242-254
0006-3495
1542-0086
http://dx.doi.org/10.1016/j.bpj.2014.05.020
http://dspace.library.iitb.ac.in/jspui/handle/100/16651
 
Language English