Association with the SRC family tyrosyl kinase LYN triggers a conformational change in the catalytic region of human cAMP-specific phosphodiesterase HSPDE4A4B. Consequences for rolipram inhibition

Ian McPhee, Stephen Yarwood, Grant Scotland, Elaine Huston, Matthew B. Beard, Annette H. Ross, Emma S. Houslay, Miles Douglas Houslay

    Research output: Contribution to journalArticle

    Abstract

    The cAMP-specific phosphodiesterase (PDE) HSPDE 4A4B(pde46) selectively bound SH3 domains of SRC family tyrosyl kinases. Such an interaction profoundly changed the inhibition of PDE4 activity caused by the PDE4-selective inhibitor rolipram and mimicked the enhanced rolipram inhibition seen for particulate, compared with cytosolic pde46 expressed in COS7 cells. Particulate pde46 co-localized with LYN kinase in COS7 cells. The unique N-terminal and LR2 regions of pde46 contained the sites for SH3 binding. Altered rolipram inhibition was triggered by SH3 domain interaction with the LR2 region. Purified LYN SH3 and human PDE4A LR2 could be co-immunoprecipitated, indicating a direct interaction. Protein kinase A-phosphorylated pde46 remained able to bind LYN SH3. pde46 was found to be associated with SRC kinase in the cytosol of COS1 cells, leading to aberrant kinetics of rolipram inhibition. It is suggested that pde46 may be associated with SRC family tyrosyl kinases in intact cells and that the ensuing SH3 domain interaction with the LR2 region of pde46 alters the conformation of the PDE catalytic unit, as detected by altered rolipram inhibition. Interaction between pde46 and SRC family tyrosyl kinases highlights a potentially novel regulatory system and point of signaling system cross-talk.

    Original languageEnglish
    Pages (from-to)11796-11810
    Number of pages15
    JournalJournal of Biological Chemistry
    Volume274
    Issue number17
    DOIs
    Publication statusPublished - 23 Apr 1999

    Keywords

    • 3',5'-Cyclic-AMP Phosphodiesterases
    • Amino Acid Sequence
    • Animals
    • Base Sequence
    • COS Cells
    • Catalytic Domain
    • DNA Primers
    • Humans
    • Molecular Sequence Data
    • Mutagenesis, Site-Directed
    • Phosphodiesterase Inhibitors
    • Protein Conformation
    • Pyrrolidinones
    • Rolipram
    • src-Family Kinases

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