G protein subunits beta
g protein subunits beta
Guanine nucleotide binding proteins (G proteins) are membrane-associated, heterotrimeric proteins composed of three subunits: alpha, beta and gamma. This entry consists of the G protein beta subunit, which assumes a barrel-shaped beta-propeller structure containing WD-40 repeats preceded by an N-terminal alpha helix. The beta subunit forms a stable dimer with the gamma subunit. The alpha subunit only contacts the beta subunit in the dimer, lying on the opposite face from the gamma subunit.