Guanine Nucleotide Binding Protein Alpha Inhibiting Activity 1 (GNAI1) Human Recombinant Protein

Guanine nucleotide binding proteins are heterotrimeric signal-transducing molecules consisting of alpha, beta, and gamma subunits. The alpha subunit binds guanine nucleotide, can hydrolyze GTP, and can interact with other proteins. The protein encoded by this gene represents the alpha subunit of an inhibitory complex. The encoded protein is part of a complex that responds to beta-adrenergic signals by inhibiting adenylate cyclase. Two transcript variants encoding different isoforms have been found for this gene. [provided by RefSeq, Jan 2012]

G-alpha i1: Guanine nucleotide-binding proteins (G proteins) are involved as modulators or transducers in various transmembrane signaling systems. The G(i) proteins are involved in hormonal regulation of adenylate cyclase: they inhibit the cyclase in response to beta-adrenergic stimuli. The inactive GDP-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. Interacts with GPSM1. Interacts with RGS12. Interacts (via active GTP- or inactive GDP-bound forms) with RGS14 (via RGS and GoLoco domains); the interaction occurs in the centrosomes. Interacts (GDP-bound form) with RIC8A (via C-terminus). Interacts with DRD2. G proteins are composed of 3 units; alpha, beta and gamma. The alpha chain contains the guanine nucleotide binding site. Belongs to the G-alpha family. G(i/o/t/z) subfamily.

Protein type: G protein, heterotrimeric; G protein, heterotrimeric alpha G((i/o/t/z)); G protein

Chromosomal Location of Human Ortholog: 7q21

Cellular Component: centrosome; lysosomal membrane; cytoplasm; plasma membrane; heterotrimeric G-protein complex; midbody; nucleus

Molecular Function: GTPase activity; signal transducer activity; protein binding; GTP binding; metal ion binding; G-protein beta/gamma-subunit binding; metabotropic serotonin receptor binding

Biological Process: G-protein signaling, coupled to cAMP nucleotide second messenger; G-protein coupled receptor protein signaling pathway; response to peptide hormone stimulus; platelet activation; synaptic transmission; cell division; metabolic process; G-protein signaling, adenylate cyclase inhibiting pathway; blood coagulation; cell cycle