RGS1 belongs to the the Regulators of G protein Signaling (RGS) protein family, whose members control the activity of G proteins through the acceleration of GTPase activity of the alpha subunits of G proteins []. RGS1 may be involved in the regulation of B-cell activation and proliferation []. The genetic variants in the RGS gene have been linked to susceptibility to coeliac disease (CD), an autoimmune disorder of the small intestine [].
RHIP1 provides a physical connection between the glucose signaling sensors RGS1 and HXK1, and is required for some glucose-regulated gene expression in plants [].
RGS13 is a member of R4 subfamily of RGS family, a diverse group of multifunctional proteins that regulate cellular signaling events downstream of G-protein coupled receptors (GPCRs) []. Signaling is initiated when GPCRs bind to their ligands, triggering the replacement of GDP bound to the G-alpha subunits of heterotrimeric G proteins with GTP. RGSs inhibit signal transduction by increasing the GTPase activity of G protein alpha subunits, thereby driving them into their inactive GDP-bound form. This activity defines them as GTPase activating proteins (GAPs).RGS13 exhibits relatively restricted tissue expression in T and B lymphocytes, as well as mast cells (MCs). RGS13 acts together with RGS1 to regulate chemokine receptor signaling in germinal centre B lymphocytes [, ]. In MCs, it inhibits G protein-coupled receptor signaling and suppresses IgE-antigen-induced MC degranulation and anaphylaxis [].
This entry represents a structural domain with a multi-helical fold consisting of a 4-helical bundle with a left-handed twist and an up-and-down topology. This domain can be divided into two all-alpha subdomains. This domain is found in regulation of G-protein signalling (RGS) proteins, as well as other related proteins, including:RGS4 [].RGS9 [].G-alpha interacting protein GaIP [].Axin [].p115RhoGEF [].Pdz-RhoGEF [].G-protein coupled receptor kinase 2 N-terminal domain [].RGS (Regulator of G Protein Signalling) proteins are multi-functional, GTPase-accelerating proteins that promote GTP hydrolysis by the alpha subunit of heterotrimeric G proteins, thereby inactivating the G protein and rapidly switching off G protein-coupled receptor signalling pathways. Upon activation by GPCRs, heterotrimeric G proteins exchange GDP for GTP, are released from the receptor, and dissociate into free, active GTP-bound alpha subunit and beta-gamma dimer, both of which activate downstream effectors. The response is terminated upon GTP hydrolysis by the alpha subunit (), which can then bind the beta-gamma dimer (, ) and the receptor. RGS proteins markedly reduce the lifespan of GTP-bound alpha subunits by stabilising the G protein transition state.All RGS proteins contain an 'RGS-box' (or RGS domain), which is required for activity. Some small RGS proteins such as RGS1 and RGS4 are comprised of little more than an RGS domain, while others also contain additional domains that confer further functionality. RGS domains can be found in conjunction with a variety of domains, including: DEP for membrane targeting (), PDZ for binding to GPCRs (), PTB for phosphotyrosine-binding (), RBD for Ras-binding (), GoLoco for guanine nucleotide inhibitor activity (), PX for phosphatidylinositol-binding (), PXA that is associated with PX (), PH for stimulating guanine nucleotide exchange (), and GGL (G protein gamma subunit-like) for binding G protein beta subunits (). Those RGS proteins that contain GGL domains can interact with G protein beta subunits to form novel dimers that prevent G protein gamma subunit binding and G protein alpha subunit association, thereby preventing heterotrimer formation.
RGS (Regulator of G Protein Signalling) proteins are multi-functional, GTPase-accelerating proteins that promote GTP hydrolysis by the alpha subunit of heterotrimeric G proteins []. Upon activation by GPCRs, heterotrimeric G proteins exchange GDP for GTP, are released from the receptor, and dissociate into free, active GTP-bound alpha subunit and beta-gamma dimer, both of which activate downstream effectors. Usually, the response is terminated upon GTP hydrolysis by the alpha subunit (), which can then bind the beta-gamma dimer (, ) and the receptor. However, in some cases, RGS proteins can have a positive effect on signal potentiation []. All RGS proteins contain an 'RGS-box' (or RGS domain), which is required for activity. Some small RGS proteins such as RGS1 and RGS4 are comprised of little more than an RGS domain, while others also contain additional domains that confer further functionality [, ]. RGS domains can be found in conjunction with a variety of domains, including: DEP for membrane targeting (), PDZ for binding to GPCRs (), PTB for phosphotyrosine-binding (), RBD for Ras-binding (), GoLoco for guanine nucleotide inhibitor activity (), PX for phosphatidylinositol-binding (), PXA that is associatedwith PX (), PH for stimulating guanine nucleotide exchange (), and GGL (G protein gamma subunit-like) for binding G protein beta subunits () []. Those RGS proteins that contain GGL domains can interact with G protein beta subunits to form novel dimers that prevent G protein gamma subunit binding and G protein alpha subunit association, thereby preventing heterotrimer formation.The RSG box in RSG4 corresponds to an array of α-helices that fold into two domains. Both are required for GAP (GTPase activating protein) activity []. This superfamily represents the subdomains 1 and 3 of the RSG box.
This entry represents a structural domain superfamily with a multi-helical fold consisting of a 4-helical bundle with a left-handed twist and an up-and-down topology. This domain can be divided into two all-alpha subdomains. This domain is found in regulation of G-protein signalling (RGS) proteins, as well as other related proteins, including:RGS4 [].RGS9 [].G-alpha interacting protein GaIP [].Axin [].p115RhoGEF [].Pdz-RhoGEF [].G-protein coupled receptor kinase 2 N-terminal domain [].RGS (Regulator of G Protein Signalling) proteins are multi-functional, GTPase-accelerating proteins that promote GTP hydrolysis by the alpha subunit of heterotrimeric G proteins, thereby inactivating the G protein and rapidly switching off G protein-coupled receptor signalling pathways. Upon activation by GPCRs, heterotrimeric G proteins exchange GDP for GTP, are released from the receptor, and dissociate into free, active GTP-bound alpha subunit and beta-gamma dimer, both of which activate downstream effectors. The response is terminated upon GTP hydrolysis by the alpha subunit (), which can then bind the beta-gamma dimer (, ) and the receptor. RGS proteins markedly reduce the lifespan of GTP-bound alpha subunits by stabilising the G protein transition state.All RGS proteins contain an 'RGS-box' (or RGS domain), which is required for activity. Some small RGS proteins such as RGS1 and RGS4 are comprised of little more than an RGS domain, while others also contain additional domains that confer further functionality. RGS domains can be found in conjunction with a variety of domains, including: DEP for membrane targeting (), PDZ for binding to GPCRs (), PTB for phosphotyrosine-binding (), RBD for Ras-binding (), GoLoco for guanine nucleotide inhibitor activity (), PX for phosphatidylinositol-binding (), PXA that is associated with PX (), PH for stimulating guanine nucleotide exchange (), and GGL (G protein gamma subunit-like) for binding G protein beta subunits (). Those RGS proteins that contain GGL domains can interact with G protein beta subunits to form novel dimers that prevent G protein gamma subunit binding and G protein alpha subunit association, thereby preventing heterotrimer formation.
RGS (Regulator of G Protein Signalling) proteins are multi-functional, GTPase-accelerating proteins that promote GTP hydrolysis by the alpha subunit of heterotrimeric G proteins []. Upon activation by GPCRs, heterotrimeric G proteins exchange GDP for GTP, are released from the receptor, and dissociate into free, active GTP-bound alpha subunit and beta-gamma dimer, both of which activate downstream effectors. Usually, the response is terminated upon GTP hydrolysis by the alpha subunit (), which can then bind the beta-gamma dimer (, ) and the receptor. However, in some cases, RGS proteins can have a positive effect on signal potentiation []. All RGS proteins contain an 'RGS-box' (or RGS domain), which is required for activity. Some small RGS proteins such as RGS1 and RGS4 are comprised of little more than an RGS domain, while others also contain additional domains that confer further functionality [, ]. RGS domains can be found in conjunction with a variety of domains, including: DEP for membrane targeting (), PDZ for binding to GPCRs (), PTB for phosphotyrosine-binding (), RBD for Ras-binding (), GoLoco for guanine nucleotide inhibitor activity (), PX for phosphatidylinositol-binding (), PXA that is associated with PX (), PH for stimulating guanine nucleotide exchange (), and GGL (G protein gamma subunit-like) for binding G protein beta subunits () []. Those RGS proteins that contain GGL domains can interact with G protein beta subunits to form novel dimers that prevent G protein gamma subunit binding and G protein alpha subunit association, thereby preventing heterotrimer formation.The RSG box in RSG4 corresponds to an array of α-helices that fold into two domains. Both are required for GAP (GTPase activating protein) activity []. This superfamily represents the subdomain 2 of the RSG box.
