Rebois R V, Warner D R, Basi N S
Membrane Biochemistry Section, NINDS, NIH, Bethesda, MD 20892, USA.
Cell Signal. 1997 Feb;9(2):141-51. doi: 10.1016/s0898-6568(96)00133-7.
Heterotrimeric (alpha beta gamma) G proteins mediate a variety of signal transduction events in virtually every cell of every eukaryotic organism. The predominant hypothesis is that dissociation of the alpha-subunit from the G beta gamma-subunit complex necessarily accompanies the activation of these proteins, and that the alpha-subunit is primarily responsible for regulating the response of effector molecules. However, there is increasing evidence that both the alpha-subunit and the beta gamma-subunit complex function in regulating effector activity. Furthermore, data for some G proteins suggest that they function as activated heterotrimers rather than as dissociated subunits.
