Any of a family of heterotrimeric GTP-binding and hydrolyzing proteins; they belong to a superfamily of GTPases that includes monomeric proteins such as EF-Tu and RAS. Heterotrimeric G-proteins consist of three subunits; the alpha subunit contains the guanine nucleotide binding site and possesses GTPase activity; the beta and gamma subunits are tightly associated and function as a beta-gamma heterodimer; extrinsic plasma membrane proteins (cytoplasmic face) that function as a complex to transduce signals from G protein-coupled receptors to an effector protein.
high-affinity iron permease complex
histamine-gated chloride channel complex
inaD signaling complex
inhibin-betaglycan-ActRII complex
interleukin-12-interleukin-12 receptor complex
interleukin4-interleukin-4 receptor complex
inward rectifying potassium channel
low-density lipoprotein receptor complex
MalFGK2 complex
MdtBC Complex
membrane attack complex
MHC protein complex +
MPP7-DLG1-LIN7 complex
NADPH oxidase complex
NarGHI complex
Ost-alpha/Ost-beta complex
plasma membrane fumarate reductase complex
plasma membrane proton-transporting ATP synthase complex +
plasma membrane proton-transporting ATP synthase complex, catalytic core F(1) +
plasma membrane proton-transporting ATP synthase complex, coupling factor F(o) +
plasma membrane proton-transporting ATP synthase, catalytic core
plasma membrane proton-transporting ATP synthase, central stalk
plasma membrane proton-transporting ATP synthase, stator stalk