Kinetic model of GPCR-G protein interactions reveals allokairic modulation of signaling

Kelly J. Culhane, Tejas M. Gupte, Indrani Madhugiri, Chetan J. Gadgil () and Sivaraj Sivaramakrishnan ()
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Kelly J. Culhane: Cell Biology and Development, University of Minnesota
Tejas M. Gupte: Cell Biology and Development, University of Minnesota
Indrani Madhugiri: Chemical Engineering Division, CSIR-National Chemical Laboratory
Chetan J. Gadgil: Chemical Engineering Division, CSIR-National Chemical Laboratory
Sivaraj Sivaramakrishnan: Cell Biology and Development, University of Minnesota

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Established models of ternary complex formation between hormone, G protein coupled receptor (GPCR), and G protein assume that all interactions occur under equilibrium conditions. However, recent studies have established that the lifetimes of these interactions are comparable to the duration of hormone activated GPCR signaling. To simulate interactions during such non-equilibrium conditions, we propose a kinetic model wherein the receptor undergoes rate-limiting transitions between two hormone-bound active states. Simulations, using experimentally measured parameters, demonstrate transient states in ternary complex formation, and delineate the phenomenon of GPCR priming, wherein non-cognate G proteins substantially enhance cognate G protein signaling. Our model reveals that kinetic barriers of slow receptor interconversion can be overcome through allokairic modulation, a regulatory mechanism of ternary complex formation and downstream signaling.

Date: 2022
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DOI: 10.1038/s41467-022-28789-5

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