General description
GRK7 is a member of the G protein-coupled receptor kinase subfamily and is a Ser/Thr protein kinase. GRK7 is specifically expressed in the retina and has been shown to phosphorylate cone opsins and initiate their deactivation. GRK7 catalyzes rhodopsin phosphorylation in a light-dependent manner. GRK7 co-localizes with GRK1 in human cone outer segments. PKA phosphorylates GRK7 at Ser(23) and Ser(36) in vitro and phosphorylation of GRK7 by PKA reduces the ability of GRK7 to phosphorylate rhodopsin in vitro. Since exposure to light causes a decrease in cAMP levels in rod cells, it is proposed that phosphorylation of GRK7 by PKA occurs in the dark.
Physical form
Supplied in 50mM Tris-HCl, pH 7.5, 150mM NaCl, 10mM glutathione, 0.1mM EDTA, 0.25mM DTT, 0.1mM PMSF, 25% glycerol.
Preparation Note
after opening, aliquot into smaller quantities and store at -70 °C. Avoid repeating handling and multiple freeze/thaw cycles
Legal Information
PRECISIO is a registered trademark of Merck KGaA, Darmstadt, Germany
| recombinant | expressed in baculovirus infected Sf9 cells |
| product line | PRECISIO® Kinase |
| assay | ≥70% (SDS-PAGE) |
| form | buffered aqueous glycerol solution |
| specific activity | 2.1-2.9 nmol/min·mg |
| mol wt | ~89 kDa |
| NCBI accession no. | NM_139209 |
| shipped in | dry ice |
| storage temp. | −70°C |
| Gene Information | human ... GRK7(131890) |
