title: A-kinase anchoring protein 9 and IKs channel regulation.
abstract: A-kinase anchoring proteins (AKAPs) create compartmentalized environment inside the cell to bring various signaling molecules to their targets. In the heart, a slowly activating potassium channel (IKs) important for cardiac repolarization is tightly regulated by the sympathetic nervous system in an AKAP-dependent manner. IKs channel forms a macromolecular complex with AKAP9 and other enzymes, such as protein kinase A, phosphatase, adenylyl cyclase, and phosphodiesterase, all of which are responsible to control the phosphorylation state of the channel. Such a complex thus ensures the IKs channel to be regulated properly to maintain the normal cardiac rhythm. Disruptions of various elements of the complex have been found to cause severe pathological consequences, including the long QT syndrome.
authors: Department of Pharmacology, College of Physicians and Surgeons, Columbia University, New York, NY 10032, USA.
authors: Lei
authors: L
authors: Chen
authors: Robert S
authors: RS
authors: Kass
mesh_terms: D054758:A Kinase Anchor Proteins / Q000378:metabolism*; D003598:Cytoskeletal Proteins / Q000378:metabolism*; D006339:Heart Rate / Q000502:physiology; D006801:Humans; D008133:Long QT Syndrome / Q000235:genetics / Q000503:physiopathology; D024642:Potassium Channels, Voltage-Gated / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology
chemical_list: D054758:A Kinase Anchor Proteins; C119719:AKAP9 protein, human; D003598:Cytoskeletal Proteins; D024642:Potassium Channels, Voltage-Gated; C059983:potassium channel protein I(sk)