Enables several functions, including GTPase activating protein binding activity; guanyl ribonucleotide binding activity; and magnesium ion binding activity. Involved in several processes, including cellular response to forskolin; negative regulation of synaptic transmission; and regulation of cAMP-mediated signaling. Located in several cellular components, including centrosome; membrane raft; and plasma membrane. Part of protein-containing complex. Orthologous to human GNAI1 (G protein subunit alpha i1). [provided by Alliance of Genome Resources, Apr 2022]