Systematic name M7772
Brief description fl-arrestins in GPCR Desensitization
Full description or abstract Role of -arrestins in the desensitization, sequestration and intracellular trafficking of GPCRs. Homologous desensitization of GPCRs (1) results from the binding of -arrestins (-arr) to agonist -occupied receptors following phosphorylation of the receptor by GRKs. -arrestin binding sterically precludes coupling between the receptor and heterotrimeric G proteins, leading to termination of signaling by G proteins effectors. Receptor-bound -arrestins also act as adapter proteins, binding to components of the clathrin endocytic machinery including clathrin, 2-adaptin (AP-2). Receptor sequestration (2) reflects the dynamin (Dyn)-dependent endocytosis of GPCRs via clathrin-coated pits. Once internalized, GPCRs exhibit two distinct patterns of -arrestin interaction. `Class A' GPCRs, for example the 2 adrenergic receptor, rapidly dissociate from -arrestin upon internalization. These receptors are trafficked to an acidified endosomal compartment, wherein the ligand is dissociated and the receptor dephosphorylated by a GPCR-specific protein phosphatase PP2A isoform, and are subsequently recycled to the plasma membrane (3). `Class B' receptors, for example the angiotensin II AT1a receptor, form stable receptor--arrestin complexes. These receptors accumulate in endocytic vesicles and are either targeted for degradation or slowly recycled to the membrane via as yet poorly defined routes.
Collection C2: curated gene sets
      CP:BIOCARTA: BioCarta gene sets
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Organism Homo sapiens
Contributed by BioCarta
Source platform EntrezGeneIds
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Compendia expression profiles Human tissue compendium (Novartis)
NCI-60 cell lines (National Cancer Institute)
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