SAG Antibody – Mouse Monoclonal

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. S-arrestin, also known as S-antigen, is a major soluble photoreceptor protein that is involved in desensitization of the photoactivated transduction cascade. It is expressed in the retina and the pineal gland and inhibits coupling of rhodopsin to transducin in vitro. Additionally, S-arrestin is highly antigenic, and is capable of inducing experimental autoimmune uveoretinitis. Mutations in this gene have been associated with Oguchi disease, a rare autosomal recessive form of night blindness. [provided by RefSeq, Jul 2008]

SAG: Arrestin is one of the major proteins of the ros (retinal rod outer segments); it binds to photoactivated- phosphorylated rhodopsin, thereby apparently preventing the transducin-mediated activation of phosphodiesterase. Retina and pineal gland. Belongs to the arrestin family.

Protein type: G protein regulator, misc.; Motility/polarity/chemotaxis

Chromosomal Location of Human Ortholog: 2q37.1

Cellular Component: cytosol; photoreceptor inner segment; photoreceptor outer segment

Molecular Function: opsin binding; phosphoprotein binding; protein phosphatase inhibitor activity

Biological Process: cell surface receptor linked signal transduction; negative regulation of catalytic activity; phototransduction, visible light; regulation of rhodopsin mediated signaling; rhodopsin mediated signaling; visual perception

Disease: Oguchi Disease 1; Retinitis Pigmentosa 47