Guanine nucleotide-binding protein subunit alpha-13 (GNA13)

Guanine nucleotide-binding protein subunit alpha-13 (GNA13) is an intracellular G protein alpha subunit in the G12/13 family, functioning as a regulatory GTPase that couples to G protein-coupled receptors (GPCRs) to transduce extracellular signals into a variety of cellular responses[1][3][5]. Upon activation by ligand-bound GPCRs, GNA13 exchanges GDP for GTP, dissociates from Gβγ, and interacts with specific guanine nucleotide exchange factors (RhoGEFs) to activate Rho family GTPases—crucial modulators of actin cytoskeleton dynamics, cell migration, and gene transcription[1][3][5]. GNA13 plays roles in normal physiology such as immune cell migration and vascular development, while gain-of-function mutations or dysregulation are implicated in tumorigenesis, particularly B-cell lymphoma and other cancers[1][4][5]. There are currently no approved drugs that directly target GNA13, but its centrality in GPCR-Rho GTPase signaling makes it a potential therapeutic interest for diseases involving aberrant cell migration, proliferation, and survival[3][5][6].

Other names

G protein subunit alpha 13G alpha-13G-protein subunit alpha-13G13MGC46138HG1Nguanine nucleotide binding protein alpha 13GALPHA13G protein alpha 13G protein α 13AU024132

Downstream effectors are modulated by GNA13 through GTP-binding and interaction with Rho guanine nucleotide exchange factors (RhoGEFs), leading to RhoA activation and signaling cascades such as RhoA/ROCK, PLC-ε, MAPK, and others. Inhibition or modulation of upstream G protein-coupled receptor (GPCR) signaling affects GNA13 activity.