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MAPK9

The protein encoded by this gene is a member of the MAP kinase family. MAP kinases act as an integration point for multiple biochemical signals, and are involved in a wide variety of cellular processes such as proliferation, differentiation, transcription regulation and development. This kinase targets specific transcription factors, and thus mediates immediate-early gene expression in response to various cell stimuli. It is most closely related to MAPK8, both of which are involved in UV radiation induced apoptosis, thought to be related to the cytochrome c-mediated cell death pathway. This gene and MAPK8 are also known as c-Jun N-terminal kinases. This kinase blocks the ubiquitination of tumor suppressor p53, and thus it increases the stability of p53 in nonstressed cells. Studies of this gene's mouse counterpart suggest a key role in T-cell differentiation. Several alternatively spliced transcript variants encoding distinct isoforms have been reported. [provided by RefSeq, Sep 2008]
Protein class

Enzymes, Metabolic proteins, RAS pathway related proteins

Predicted location

Intracellular

Single cell type specificity

Cell type enhanced (Inhibitory neurons)

Immune cell specificity

Immune cell enriched (basophil)

Cell line specificity

Cell line enhanced (HDLM-2)

Interaction

Interacts with MECOM (By similarity). Interacts with DCLK2 (By similarity). Binds to at least four scaffolding proteins, MAPK8IP1/JIP-1, MAPK8IP2/JIP-2, MAPK8IP3/JIP-3/JSAP1 and SPAG9/MAPK8IP4/JIP-4. These proteins also bind other components of the JNK signaling pathway (By similarity). Interacts with NFATC4 (PubMed:17875713). Interacts with ATF7; the interaction does not phosphorylate ATF7 but acts as a docking site for ATF7-associated partners such as JUN (PubMed:10376527). Interacts with BCL10 (PubMed:17189706). Interacts with CTNNB1 and GSK3B (PubMed:19675674). Interacts with MAPKBP1 (PubMed:28089251). Interacts with POU5F1; phosphorylates POU5F1 at 'Ser-355'. Found in a complex with SH3RF1, RAC2, MAP3K7/TAK1, MAP2K7/MKK7, MAPK8IP1/JIP1 and MAPK8/JNK1 (By similarity).

Molecular function

Kinase, Serine/threonine-protein kinase, Transferase

More Types Infomation

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For Research Use Only. Not For Clinical Use.

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