Topic summary

G-proteins

Extracted from the Wikipedia article G protein.

There are two classes of G proteins. The first function as monomeric small GTPases (small G-proteins), while the second function as heterotrimeric G protein complexes. The latter class of complexes is made up of alpha (G_α), beta (G_β) and gamma (G_γ) subunits. In addition, the beta and gamma subunits can form a stable dimeric complex referred to as the beta-gamma complex .