RGS8 is a member of R4 subfamily of RGS family, a diverse group of multifunctional proteins that regulate cellular signalling events downstream of G-protein coupled receptors (GPCRs) []. Signalling 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).RGS8 is involved in G-protein-gated potassium channels regulation [, ]and is predominantly expressed in the brain []. In the hematopoietic system, it is selectively expressed in natural killer (NK) cells [].
Ataxin-2 has many functions, such as endocytic receptor cycling [], translational regulation, embryonic development [], energy metabolism and weight regulation []. Mutations of the Ataxin-2 gene cause spinocerebellar ataxia 2 (SCA2), a neurodegenerative disorder leading to predominant loss of Purkinje cells in the cerebellum and impairment of motor coordination []. In SCA2, expansion of a CAG repeat in exon 1 of the Ataxin-2 (ATXN2) gene causes expansion of a polyQ domain in the ATXN2 protein []. ATXN2 has been shown to interact with many proteins. It interacts with multiple RNA-binding proteins (RBPs), staufen, IP3R, RGS8 mRNA, endophilins and CIN85 [].
The RGS (Regulator of G-protein Signalling) domain is an essential part of the RGS8 protein.RGS8 is a member of R4 subfamily of RGS family, a diverse group of multifunctional proteins that regulate cellular signalling events downstream of G-protein coupled receptors (GPCRs) []. Signalling 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).RGS8 is involved in G-protein-gated potassium channels regulation [, ]and is predominantly expressed in the brain []. In the hematopoietic system, it is selectively expressed in natural killer (NK) cells [].
This SM domain is found in Ataxin-2 [, ]. This domain has been shown to interact with RNA helicase DDX6 [].Ataxin-2 has many functions, such as endocytic receptor cycling [], translational regulation, embryonic development [], energy metabolism and weight regulation []. Mutations of the Ataxin-2 gene cause spinocerebellar ataxia 2 (SCA2), a neurodegenerative disorder leading to predominant loss of Purkinje cells in the cerebellum and impairment of motor coordination []. In SCA2, expansion of a CAG repeat in exon 1 of the Ataxin-2 (ATXN2) gene causes expansion of a polyQ domain in the ATXN2 protein []. ATXN2 has been shown to interact with many proteins. It interacts with multiple RNA-binding proteins (RBPs), staufen, IP3R, RGS8 mRNA, endophilins and CIN85 [].
This domain can be found in eukaryotic ataxin-2 []. Ataxin-2 is predicted to consist of mostly non-globular domains []. This domain has been shown to interact with RNA helicase DDX6 [].Ataxin-2 has many functions, such as endocytic receptor cycling [], translational regulation, embryonic development [], energy metabolism and weight regulation []. Mutations of the Ataxin-2 gene cause spinocerebellar ataxia 2 (SCA2), a neurodegenerative disorder leading to predominant loss of Purkinje cells in the cerebellum and impairment of motor coordination []. In SCA2, expansion of a CAG repeat in exon 1 of the Ataxin-2 (ATXN2) gene causes expansion of a polyQ domain in the ATXN2 protein []. ATXN2 has been shown to interact with many proteins. It interacts with multiple RNA-binding proteins (RBPs), staufen, IP3R, RGS8 mRNA, endophilins and CIN85 [].Proteins containing this domain also include Pbp1 from budding yeasts, Pbp1 interacts with Pab1 to regulate mRNA polyadenylation [, ]. It promotes mating-type switching in mother cells by positively regulating HO mRNA translation []and forms a condensate in response to respiratory status to regulate TORC1 signaling []. It is also involved in P-body-dependent granule assembly [].
This entry represents a group of RNA-binding proteins , including Ataxin-2 from animals, Pbp1 from fungi and Cid3/4 from Arabidopsis.Ataxin-2 has many functions, such as endocytic receptor cycling [], translational regulation, embryonic development [], energy metabolism and weight regulation []. Mutations of the Ataxin-2 gene cause spinocerebellar ataxia 2 (SCA2), a neurodegenerative disorder leading to predominant loss of Purkinje cells in the cerebellum and impairment of motor coordination []. In SCA2, expansion of a CAG repeat in exon 1 of the Ataxin-2 (ATXN2) gene causes expansion of a polyQ domain in the ATXN2 protein []. ATXN2 has been shown to interact with many proteins. It interacts with multiple RNA-binding proteins (RBPs), staufen, IP3R, RGS8 mRNA, endophilins and CIN85 [].Pbp1 interacts with Pab1 to regulate mRNA polyadenylation [, ]. It promotes mating-type switching in mother cells by positively regulating HO mRNA translation []and forms a condensate in response to respiratory status to regulate TORC1 signalling []. It is also involved in P-body-dependent granule assembly [].Cid3/4 may have a role in developmental pathways throughout the life cycle of plants [].
