Gnb3, Guanine nucleotide binding protein G protein, beta polypeptide 3, Guanine nucleotide binding protein G, Hypertension associated protein, IG, SG, Transducin beta chain 3, Tsubunit beta 3, GBB3_HUMAN.
G proteins are composed of 3 units, alpha, beta and gamma and are involved in the modulation and transduction of various transmembrane signalling systems. There are families of related genes for each subunit. GNB3 encodes a beta subunit. Beta subunits are required for GTPase activity, for replacement of GDP by GTP, regulate alpha subunits and for G protein-effector interactions. A single-nucleotide polymorphism (C825T) in this gene is associated with essential hypertension and obesity and is also associated with the occurrence of the splice variant GNB3-s, which appears to have increased activity.
