title: The unique amino-terminal region of the PDE4D5 cAMP phosphodiesterase isoform confers preferential interaction with beta-arrestins.
abstract: Isoproterenol challenge of Hek-B2 cells causes a transient recruitment of the endogenous PDE4D isoforms found in these cells, namely PDE4D3 and PDE4D5, to the membrane fraction. PDE4D5 provides around 80% of the total PDE4D protein so recruited, although it only comprises about 40% of the total PDE4D protein in Hek-B2 cells. PDE4D5 provides about 80% of the total PDE4D protein found associated with beta-arrestins immunopurified from Hek-B2, COS1, and A549 cells as well as cardiac myocytes, whereas its overall level in these cells is between 15 and 50% of the total PDE4D protein. Truncation analyses indicate that two sites in PDE4D5 are involved in mediating its interaction with beta-arrestins, one associated with the common PDE4 catalytic region and the other located within its unique amino-terminal region. Truncation analyses indicate that two sites in beta-arrestin 2 are involved in mediating its interaction with PDE4D5, one associated with its extreme amino-terminal region and the other located within the carboxyl-terminal domain of the protein. We suggest that the unique amino-terminal region of PDE4D5 allows it to preferentially interact with beta-arrestins. This specificity appears likely to account for the preferential recruitment of PDE4D5, compared with PDE4D3, to membranes of Hek-B2 cells and cardiac myocytes upon challenge with isoproterenol.
mesh_terms: D000595:Amino Acid Sequence; D019390:Arrestins / Q000378:metabolism*; D002460:Cell Line; D054684:Cyclic Nucleotide Phosphodiesterases, Type 3; D054703:Cyclic Nucleotide Phosphodiesterases, Type 4; D006801:Humans; D007527:Isoenzymes / Q000737:chemistry / Q000378:metabolism*; D008969:Molecular Sequence Data; D010727:Phosphoric Diester Hydrolases / Q000737:chemistry / Q000378:metabolism*; D011485:Protein Binding; D000071560:beta-Arrestin 2; D000071557:beta-Arrestins
chemical_list: C000605254:ARRB2 protein, human; D019390:Arrestins; D007527:Isoenzymes; D000071560:beta-Arrestin 2; D000071557:beta-Arrestins; D010727:Phosphoric Diester Hydrolases; D054684:Cyclic Nucleotide Phosphodiesterases, Type 3; D054703:Cyclic Nucleotide Phosphodiesterases, Type 4; C517376:PDE4D protein, human