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 (PubMed:14534135). G proteins are composed of 3 units, alpha, beta and gamma (By similarity). Interacts with G protein gamma subunits gpc-1 and gpc-2 and with egl-10 and eat-16 (PubMed:11333232). Interacts with goa-1 (in GDP-bound form) (PubMed:12730122). RNAi-mediated knockdown in one-cell embryo results in hyperactive nuclear and spindle movements from early prophase to metaphase characterized by vigorous rocking of nuclear/centrosome complex and its failure to center properly. Normal centrosome alignment during metaphase. Belongs to the WD repeat G protein beta family.