The scaffold protein gravin (cAMP-dependent protein kinase-anchoring protein 250) binds the beta 2-adrenergic receptor via the receptor cytoplasmic Arg-329 to Leu-413 domain and provides a mobile scaffold during desensitization

The Journal of Biological Chemistry
G FanC C Malbon

Abstract

The cyclic AMP-dependent kinase-anchoring proteins (AKAPs) function as scaffolds for a wide-range of protein-protein interactions. The 250-kDa AKAP known as gravin plays a central role in organizing G-protein-coupled receptors to the protein kinases and phosphatases that regulate receptor function in desensitization, resensitization, and sequestration. Although gravin is critical for G-protein-linked receptor biology, the molecular features of the receptor necessary for interaction with this scaffold are not known. Herein, we map the regions of the beta(2)-adrenergic receptor that are required for binding to gravin. Intracellular loops 1, 2, and 3 appear not to participate in the binding of the receptor to the scaffold. In contrast, the C-terminal cytoplasmic region of the receptor (Arg-329 to Leu-413) competes readily for the binding of the beta(2)-adrenergic receptor by gravin, both using in vitro and in vivo assays. C-terminally truncated peptides with sequences ranging from Arg-329 to Leu-342 (13 aminoacyl residues), to Asn-352 (23 residues), to Tyr-366 (37 residues), to Asp-380 (51 residues), or to His-390 (61 residues), as well as N-terminally truncated peptides from Gln-391 to Leu-413 (23 residues) or Leu-381 to Leu-413 ...Continue Reading

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