TAOK2 (Q9UL54) - Overview - Molecular Target Synopsis
TAOK2, Serine/threonine-protein kinase TAO2
Enzyme Classification 126.96.36.199
Also Known as TAOK2_HUMAN, TAOK2, KIAA0881, MAP3K17, PSK, PSK1
Serine/threonine-protein kinase involved in different processes such as membrane blebbing and apoptotic bodies formation DNA damage response and MAPK14/p38 MAPK stress-activated MAPK cascade. Phosphorylates itself, MBP, activated MAPK8, MAP2K3, MAP2K6 and tubulins. Activates the MAPK14/p38 MAPK signaling pathway through the specific activation and phosphorylation of the upstream MAP2K3 and MAP2K6 kinases. In response to DNA damage, involved in the G2/M transition DNA damage checkpoint by activating the p38/MAPK14 stress-activated MAPK cascade, probably by mediating phosphorylation of upstream MAP2K3 and MAP2K6 kinases. Isoform 1, but not isoform 2, plays a role in apoptotic morphological changes, including cell contraction, membrane blebbing and apoptotic bodies formation. This function, which requires the activation of MAPK8/JNK and nuclear localization of C-terminally truncated isoform 1, may be linked to the mitochondrial CASP9-associated death pathway. Isoform 1 binds to microtubules and affects their organization and stability independently of its kinase activity. Prevents MAP3K7-mediated activation of CHUK, and thus NF-kappa-B activation, but not that of MAPK8/JNK. May play a role in the osmotic stress-MAPK8 pathway. Isoform 2, but not isoform 1, is required for PCDH8 endocytosis. Following homophilic interactions between PCDH8 extracellular domains, isoform 2 phosphorylates and activates MAPK14/p38 MAPK which in turn phosphorylates isoform 2. This process leads to PCDH8 endocytosis and CDH2 cointernalization. Both isoforms are involved in MAPK14 phosphorylation. Interacts with MAP2K3 and MAP2K6 (By similarity). Self-associates. Interacts with tubulins through the C-terminal domain. Interacts with MAP3K7 and interfers with MAP3K7-binding to CHUK and thus prevents NF-kappa-B activation. Isoform 2 interacts with PCDH8; this complex may also include CDH2.
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UniProt: TAOK2 is active in the following subcellular-locations: cell projection, cytoplasm, cytoplasmic vesicle membrane, cytoskeleton, dendrite, nucleus.
GO terms: TAOK2 is active in the following subcellular-locations: actin cytoskeleton, axon, axonal growth cone, cytoplasm, cytoplasmic vesicle, cytoplasmic vesicle membrane, cytosol, dendritic growth cone, integral component of membrane, neuron projection, nucleolus, nucleus, receptor complex.