Anti-Arrestin 1,2 beta (ARRB1, ARB1, ARR1, ARRB2, ARB2, ARR2)

Arrestin proteins function as negative regulators of G protein coupled receptor (GPCR) signaling. Cognate ligand binding stimulates GPCR phosphorylation, which is followed by binding of arrestin to the phosphorylat-ed GPCR and the eventual internalization of the receptor and , desensitization of GPCR signaling (1). Four distinct mam-malian arrestin proteins are known. Arrestin 1 (also known as S-arrestin) and arrestin 4 (or X-arrestin) are localized to retinal rods and cones, respectively. Arrestin 2 (also known as Beta-arrestin 1) and arrestin 3 (or Beta-arrestin 2) are ubiqui-tously expressed and bind to most GPCRs (2). Beta-arrestin proteins function as adapters and scaffold proteins and play important roles in other processes, such as recruiting c-Src family proteins to GPCRs in ERK activation pathways (3,4). Beta arrestins are also involved in some receptor tyrosine kinase signaling pathways (5-8). Additional evidence suggests that Beta-arrestin proteins translocate to the nucleus and help regulate transcription by binding transcriptional cofactors (9,10). Applications: Suitable for use in Western Blot and Immunoprecipitation. Other applications not tested. Recommended Dilution: Western Blot: 1:1000 Incubate membrane with diluted antibody in 5% w/v BSA, 1X TBS, 0.1% Tween-20 at 4°C with gentle shaking, overnight. , Immunoprecipitation: 1:200, Optimal dilutions to be determined by the researcher. Storage and Stability: May be stored at 4°C for short-term only. For long-term storage and to avoid repeated freezing and thawing, add sterile 40-50% glycerol, aliquot and store at -20°C. Aliquots are stable for at least 6 months at -20°C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.