Guanine nucleotide-binding protein G(i) subunit alpha-3 (GNAI3)

Guanine nucleotide-binding protein G(i) subunit alpha-3 (GNAI3) is the inhibitory alpha subunit of heterotrimeric G proteins, which mediate intracellular signaling downstream of G protein-coupled receptors (GPCRs). GNAI3’s primary function is to inhibit adenylyl cyclase, decreasing cyclic AMP (cAMP) levels and influencing various pathways including cell division, ion channel regulation, and vesicle trafficking. Mutations in GNAI3 disrupt craniofacial development, causing auriculocondylar syndrome. Although drugs do not directly target GNAI3 in clinical practice, it remains critical in pharmacological pathways and is a key node in the molecular signaling network of many therapeutic agents and biological processes.

Other names

G protein subunit alpha i3GNAI387U6G(i) alpha-3Guanine nucleotide-binding protein G(k) subunit alphaARCND1ARCODSHG1AGuanine nucleotide binding protein (G protein), alpha inhibiting activity polypeptide 3Guanine nucleotide-binding protein G(i) subunit alpha-3Heterotrimeric guanine nucleotide-binding protein 1A

Most drugs act indirectly: Inhibition of G protein coupled receptor (GPCR) activity, leading to modulation of GNAI3-regulated signaling cascades. Inhibition of adenylyl cyclase, resulting in reduced intracellular cAMP. Activation or inhibition of ion channels through GPCR-dependent GNAI3 pathways.