Regulator of G protein signaling 13 (RGS13)

Regulator of G protein signaling 13 (RGS13) is a small signaling protein in humans encoded by the RGS13 gene and is a member of the R4 subfamily of the RGS protein family[1][4]. RGS13 acts as a GTPase-activating protein (GAP) for G protein alpha subunits, particularly Gαi, Gαo, and possibly Gαq, thereby increasing their GTPase activity and driving them to their inactive GDP-bound state, which terminates G protein-mediated signaling[1][2]. RGS13 plays a central role in the negative regulation of G protein-coupled receptor (GPCR) signaling and is highly expressed in immune tissues, including germinal center B lymphocytes, tonsil, thymus, lymph node, and spleen[2][4][5]. Apart from its canonical role at the plasma membrane, it also has a non-canonical nuclear function where it represses CREB-dependent transcription, which is important for controlling B cell proliferation and differentiation[5]. Biologically, RGS13 has roles in constraining allergic responses (notably immunoglobulin E-mediated mast cell degranulation), regulating B cell chemotaxis and zoning within germinal centers, and fine-tuning immune system activity[4][5][7]. RGS13 is being studied in the context of cancer (especially lymphomas of germinal center origin) and inflammation but has not yet been directly targeted by any approved drugs[5][7][9].

Other names

Regulator of G-protein signaling 13RGS13regulator of G-protein signalling 13

RGS13 enhances the GTPase activity for G protein alpha subunits (Gαi, Gαo, Gαq), leading to their inactivation. This action inhibits downstream signaling cascades from GPCRs (e.g., MAPK, CREB).