TableEdit

Li, X, Baillie, GS and Houslay, MD (2009) Mdm2 directs the ubiquitination of beta-arrestin-sequestered cAMP phosphodiesterase-4D5. J. Biol. Chem. 284:16170-82

Beta-arrestin plays a key role in regulating beta2-adrenoreceptor signaling by interdicting activation of adenylyl cyclase and selectively sequestering cAMP phosphodiesterase-4D5 (PDE4D5) for delivery of an active cAMP degrading system to the site of cAMP synthesis. Here we show that the beta-agonist, isoprenaline, triggers the rapid and transient ubiquitination of PDE4D5 in primary cardiomyocytes, mouse embryo fibroblasts, and HEK293B2 cells constitutively expressing beta2-adrenoceptors. Reconstitution analyses in beta-arrestin1/2 double knockout cells plus small interference RNA knockdown studies indicate that a beta-arrestin-scaffolded pool of the E3-ubiquitin ligase, Mdm2, mediates PDE4D5 ubiquitination. Critical for this is the ubiquitin-interacting motif located in the extreme C terminus of PDE4D5, which is specific to the PDE4D sub-family. In vitro ubiquitination [corrected] of a PDE4D5 spot-immobilized peptide array, followed by a mutagenesis strategy, showed that PDE4D5 ubiquitination occurs at Lys-48, Lys-53, and Lys-78, which are located within its isoform-specific N-terminal region, as well as at Lys-140 located within its regulatory UCR1 module. We suggest that mono-ubiquitination at Lys-140 primes PDE4D5 for a subsequent cascade of polyubiquitination occurring within its isoform-specific N-terminal region at Lys-48, Lys-53, and Lys-78. PDE4D5 interacts with a non-ubiquitinated beta-arrestin sub-population that is likely to be protected from Mdm2-mediated ubiquitination due to steric hindrance caused by sequestered PDE4D5. Ubiquitination of PDE4D5 elicits an increase in the fraction of PDE4D5 sequestered by beta-arrestin in cells, thereby contributing to the fidelity of PDE4D5-beta-arrestin interaction, as well as decreasing the fraction of PDE4D5 sequestered by the scaffolding protein, RACK1.

PubMed PMC2713507 Online version:10.1074/jbc.M109.008078

Adrenergic beta-Agonists/pharmacology; Animals; Arrestins/metabolism; Cells, Cultured; Consensus Sequence; Cyclic Nucleotide Phosphodiesterases, Type 3; Fibroblasts/cytology; GTP-Binding Proteins/metabolism; Gene Knockout Techniques; Humans; Isoproterenol/pharmacology; Kidney/cytology; Lysine/metabolism; Mice; Myocytes, Cardiac/cytology; Neoplasm Proteins/metabolism; Phosphoric Diester Hydrolases/chemistry; Phosphoric Diester Hydrolases/genetics; Phosphoric Diester Hydrolases/metabolism; Protein Structure, Tertiary; Proto-Oncogene Proteins c-mdm2/genetics; Proto-Oncogene Proteins c-mdm2/metabolism; Rats; Receptors, Cell Surface/metabolism; Transfection; Ubiquitin/metabolism; Ubiquitination/drug effects; Vasopressins/pharmacology