Predicted to enable signaling receptor complex adaptor activity. Predicted to be involved in G protein-coupled dopamine receptor signaling pathway. Predicted to be located in plasma membrane. Predicted to be part of heterotrimeric G-protein complex. Predicted to be active in cytoplasm. Is expressed in several structures, including embryonic central brain neurons; embryonic head sensory system; embryonic/larval midgut; ganglia; and organism subdivision. Human ortholog(s) of this gene implicated in intellectual developmental disorder with cardiac arrhythmia. Orthologous to human GNB5 (G protein subunit beta 5).