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Regulator of G protein signaling domain (RGS) found in G protein-coupled receptor kinase 7 (GRK7) The RGS domain is an essential part of the GRK7 (G protein-coupled receptor kinases 7) proteins which together with GRK1 (Rhodopsin kinase) have been implicated in the shutoff of the photoresponse and adaptation to changing light conditions via rod and cone opsin phosphorylation. GRK7 is a member of the GRK kinase family which includes three major subfamilies: the GRK4 subfamily (GRK4, GRK5 and GRK6), the rhodopsin kinase or visual GRK subfamily (GRK1 and GRK7), and the beta-adrenergic receptor kinases subfamily (GRK2/GRK3). The RGS domain of the GRKs has very little sequence similarity with the canonical RGS domain of the RGS proteins and therefore is often refered to as the RH (RGS Homology) domain. GRK7 is expressed in all vertebrate cones except that of mice and rats, which do not have the gene for GRK7. Lack of either GRK7 or both GRK1 and GRK7 in human leads to a vision defect called Enhanced S Cone syndrome. RGS proteins regulate many aspects of embryonic development such as glial differentiation, embryonic axis formation, skeletal and muscle development, cell migration during early embryogenesis, as well as apoptosis, cell proliferation, and modulation of cardiac development. |
Jiyao W et al.(2023). "The conserved domain database in 2023.",