Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. G(k) is the stimulatory G protein of receptor- regulated K(+) channels. The active GTP-bound form prevents the association of RGS14 with centrosomes and is required for the translocation of RGS14 from the cytoplasm to the plasma membrane. May play a role in cell division. Defects in GNAI3 are the cause of auriculocondylar syndrome 1 (ARCND1). ARCND1 is an autosomal dominant craniofacial malformation syndrome characterized by variable mandibular anomalies, including mild to severe micrognathia, temporomandibular joint ankylosis, cleft palate, and a characteristic ear malformation that consists of separation of the lobule from the external ear, giving the appearance of a question mark (question-mark ear). Other frequently described features include prominent cheeks, cupped and posteriorly rotated ears, preauricular tags, and microstomia. Belongs to the G-alpha family. G(i/o/t/z) subfamily. Note: This description may include information from UniProtKB.
Protein type: G protein, heterotrimeric alpha G((i/o/t/z)); G protein, heterotrimeric; G protein
Cellular Component: Golgi apparatus; centrosome; extrinsic to internal side of plasma membrane; lysosomal membrane; cytoplasm; plasma membrane; heterotrimeric G-protein complex; midbody; lipid raft
Molecular Function: GTPase activity; signal transducer activity; GTP binding; metal ion binding; G-protein beta/gamma-subunit binding; metabotropic serotonin receptor binding
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.