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Light-induced binding of 48-kDa protein to photoreceptor membranes is highly enhanced by phosphorylation of rhodopsin
Authors:H Kühn  S W Hall  U Wilden
Institution:Institut für Neurobiologie der Kernforschungsanlage Jülich, Postfach 1913, D-5170 Jülich, FRG
Abstract:The 48-kDa protein, a major protein of rod photoreceptor cells, is soluble in the dark but associates with the disk membranes when some (5-10%) of their rhodopsin has absorbed light and if this rhodopsin is additionally phosphorylated by ATP and rhodopsin kinase. If rhodopsin has been phosphorylated and regenerated prior to the protein binding experiment, the binding of 48-kDa protein depends on light but no longer on the presence of ATP. Another photoreceptor protein, GTP-binding protein, associates with both phosphorylated and unphosphorylated rhodopsin upon illumination. Excess GTP-binding protein thereby displaces 48-kDa protein from phosphorylated disks; this indicates competition between these two proteins for binding sites on illuminated phosphorylated rhodopsin molecules.
Keywords:Rhodopsin  Phosphorylation  Light-dependence  48-kDa protein  GTP-binding protein  Photoreceptor  G-protein  GTP-binding protein  GTPγS  AMP-PNP  adenylyl imidodiphosphate  photoexcited rhodopsin  P  -disks  phosphorylated and regenerated disk membranes  C  -disks  unphosphorylated control membranes
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