Cell membrane Cell projection Cytoplasm Cytoplasmic vesicle Membrane Nucleus clathrin-coated pit pseudopodium

Members of arrestin/beta-arrestin protein family are thought to participate in agonist-mediated desensitization of G-protein-coupled receptors and cause specific dampening of cellular responses to stimuli such as hormones,neurotransmitters, or sensory signals.Arrestin beta 1 is a cytosolic protein and acts as a cofactor in the beta-adrenergic receptor kinase (BARK) mediated desensitization of beta-adrenergic receptors.Besides the central nervous system,it is expressed at high levels in peripheral blood leukocytes,and thus the BARK/beta-arrestin system is believed to play a major role in regulating receptor-mediated immune functions.Alternatively spliced transcripts encoding different isoforms of arrestin beta 1 have been described.[provided by RefSeq,Jan 2011]