AKAP9 Antibody – Goat Polyclonal

The A-kinase anchor proteins (AKAPs) are a group of structurally diverse proteins which have the common function of binding to the regulatory subunit of protein kinase A (PKA) and confining the holoenzyme to discrete locations within the cell. This gene encodes a member of the AKAP family. Alternate splicing of this gene results in at least two isoforms that localize to the centrosome and the Golgi apparatus, and interact with numerous signaling proteins from multiple signal transduction pathways. These signaling proteins include type II protein kinase A, serine/threonine kinase protein kinase N, protein phosphatase 1, protein phosphatase 2a, protein kinase C-epsilon and phosphodiesterase 4D3. [provided by RefSeq, Aug 2008]

AKAP9: Binds to type II regulatory subunits of protein kinase A. Scaffolding protein that assembles several protein kinases and phosphatases on the centrosome and Golgi apparatus. May be required to maintain the integrity of the Golgi apparatus. Isoform 4 is associated with the N-methyl-D-aspartate receptor and is specifically found in the neuromuscular junction (NMJ) as well as in neuronal synapses, suggesting a role in the organization of postsynaptic specializations. Defects in AKAP9 are the cause of long QT syndrome type 11 (LQT11). Long QT syndromes are heart disorders characterized by a prolonged QT interval on the ECG and polymorphic ventricular arrhythmias. They cause syncope and sudden death in response to excercise or emotional stress. They can present with a sentinel event of sudden cardiac death in infancy. 6 isoforms of the human protein are produced by alternative splicing.

Protein type: Adaptor/scaffold

Chromosomal Location of Human Ortholog: 7q21-q22

Cellular Component: centrosome; cis-Golgi network; cytoskeleton; cytosol; Golgi apparatus; Golgi stack; intracellular membrane-bound organelle; voltage-gated potassium channel complex

Molecular Function: potassium channel regulator activity; protein binding; protein complex scaffold; Ras guanyl-nucleotide exchange factor activity; receptor binding

Biological Process: G2/M transition of mitotic cell cycle; MAPKKK cascade; microtubule nucleation; positive regulation of GTPase activity; positive regulation of peptidyl-serine phosphorylation; signal transduction; synaptic transmission; transport

Disease: Long Qt Syndrome 11