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Regulator of G protein signaling (RGS) domain found in the FLBA (Fluffy Low BrlA) protein The RGS (Regulator of G-protein Signaling) domain is an essential part of the FLBA (Fluffy Low BrlA) protein. FLBA is a member of the RGS protein family, a diverse group of multifunctional proteins that regulate cellular signaling events downstream of G-protein coupled receptors (GPCRs). As a major G-protein regulator, RGS domain containing proteins are involved in many crucial cellular processes such as regulation of intracellular trafficking, glial differentiation, embryonic axis formation, skeletal and muscle development, and cell migration during early embryogenesis. RGS proteins play a critical regulatory role as GTPase activating proteins (GAPs) of the heterotrimeric G-protein G-alpha-subunits. Deactivation of the G-protein signaling controlled by the RGS domain accelerates the GTPase activity of the alpha subunit by hydrolysis of GTP to GDP which results in reassociation of the alpha-subunit with the beta-gamma-dimer and thereby inhibition of downstream activity. As a major G-protein regulator, RGS domain containing proteins are involved in many crucial cellular processes. The RGS domain of the FLBA protein antagonizes G protein signaling to block proliferation and allow development. It is required for control of mycelial proliferation and activation of asexual sporulation in yeast. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",