Coupling mode of receptors and G proteins.
Signaling via G-protein-coupled receptors (GPCRs) is crucial to many physiological and pathophysiological processes in multicellular organisms, and GPCRs themselves are targets for important drugs. Classical cell supplementation experiments suggest a collision coupling model, in which receptors and G proteins diffuse randomly within the cell membrane and interact only if receptors are activated. This model is also backed by kinetic and live cell imaging data. According to the challenging theory, receptors and G proteins are precoupled--meaning they are forming stable complexes in the absence of agonist, which prevail during signaling. This model has been favored on the basis of copurification and coimmunoprecipitation of inactive receptors with G proteins and more recently by some approaches measuring energy transfer between labeled receptors and G proteins. This article reviews key findings regarding the receptor/G protein coupling mode, including most recent findings obtained by optical techniques.
Hein
Peter
P
Department of Psychiatry, University of California at San Francisco, 600 16th St, UCSF MC 2140, Genentech Hall N216P, San Francisco, CA 94158-2517, USA. peter.hein@ucsf.edu
Bünemann
Moritz
M
D000818:Animals; D019204:GTP-Binding Proteins / Q000378:metabolism* / Q000502:physiology; D006801:Humans; D008954:Models, Biological; D011485:Protein Binding; D043562:Receptors, G-Protein-Coupled / Q000378:metabolism* / Q000502:physiology; D015398:Signal Transduction
D043562:Receptors, G-Protein-Coupled; D019204:GTP-Binding Proteins