Beta adrenergic receptor kinase or G-protein coupled receptor kinase (BARK), currently termed GRK2 for G protein-coupled receptor kinase 2, is an intracellular serine/threonine kinase. BARK is activated by protein kinase A. BARK phosphorylates the β adrenergic receptor (BAR) as well as many other G protein-coupled receptors when they are occupied by the agonist thus causing their desensitization. BARK belongs to the family of G protein-coupled receptor kinases (GRK) that encompases 5 different isozymes. [1]
Human BARK1 complex with RNA and Mg+2 ion;
Mg+2 ion coordination site (PDB code 3uzt).[2]
3D Structures of β adrenergic receptor kinase
Beta adrenergic receptor kinase 3D structures
- ↑ Benovic JL, Strasser RH, Caron MG, Lefkowitz RJ. Beta-adrenergic receptor kinase: identification of a novel protein kinase that phosphorylates the agonist-occupied form of the receptor. Proc Natl Acad Sci U S A. 1986 May;83(9):2797-801. PMID:2871555
- ↑ Tesmer VM, Lennarz S, Mayer G, Tesmer JJ. Molecular Mechanism for Inhibition of G Protein-Coupled Receptor Kinase 2 by a Selective RNA Aptamer. Structure. 2012 Jun 21. PMID:22727813 doi:10.1016/j.str.2012.05.002
