Guanine nucleotide-binding proteins (G proteins) are involved as a modulator or transducer in various transmembrane signaling systems. The beta and gamma chains are required for the GTPase activity, for replacement of GDP by GTP, and for G protein-effector interaction. In the early embryo, controls the magnitude of the forces acting on centrosomes but is not required for generating asymmetric forces. G proteins are composed of 3 units, alpha, beta and gamma. Interacts with G protein gamma subunits gpc-1 and gpc-2 and with egl-10 and eat-16. Interacts with goa-1 (in GDP-bound form). Belongs to the WD repeat G protein beta family.