background:
The type II cAMP-protein kinase (PKA) is a multifunctional kinase with a broad range of substrates (1). Specificity of PKA signaling is thought to be mediated by the compartmentalization of the kinase to specific sites within the cell. To maintain this specific localization, the R subunit (RII) of PKA interacts with specific RII-anchoring proteins. This family of proteins has been designated A-kinase anchoring proteins (AKAP) (1-3). Members of this family, including MAP2 (microtubule-associated protein 2), neuronally expressed AKAP 79 and AKAP 150, and the DNA binding AKAP 95, display differential tissue specificity and localization (4-6). Evidence suggests that AKAP 79 and AKAP 150 are both capable of anchoring PKA to postsynaptic densities (PSD), which are a network of proteins located on the internal surfaces of excitatory synapses。
Function:
May anchor the PKA protein to cytoskeletal and/or organelle-associated proteins, targeting the signal carried by cAMP to specific intracellular effectors. Association with to the beta2-adrenergic receptor (beta2-AR) not only regulates beta2-AR signaling pathway, but also the activation by PKA by switching off the beta2-AR signaling cascade.
Subunit:
Binding protein for dimer of the RII-beta regulatory subunit of cAMP-dependent protein kinase (PKA) and also for the protein kinase C (PKC) and the phosphatase calcineurin (PP2B). Each enzyme is inhibited when bound to the anchoring protein. Also binds the beta2-adrenergic receptor. Part of a complex containing AKAP5, ADCY5, ADCY6 AND PDE4C (By similarity). Interacts with ADCY8, and enhances its phosphorylation at lipid rafts.
Subcellular Location:
Membrane; Lipid-anchor.
Tissue Specificity:
Predominantly in the cerebral cortex and the postsynaptic densities of the forebrain, and to a lesser extent in adrenal medulla, lung and anterior pituitary.
Post-translational modifications:
Palmitoylation at Cys-36 and Cys-129 plays a key role in targeting to lipid rafts.
Similarity:
Contains 1 AKAP domain.
Database links:
UniProtKB/Swiss-Prot: P24588.3
Important Note:
This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications.
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