TAB1 Antibody – Mouse Monoclonal

The protein encoded by this gene was identified as a regulator of the MAP kinase kinase kinase MAP3K7/TAK1, which is known to mediate various intracellular signaling pathways, such as those induced by TGF beta, interleukin 1, and WNT-1. This protein interacts and thus activates TAK1 kinase. It has been shown that the C-terminal portion of this protein is sufficient for binding and activation of TAK1, while a portion of the N-terminus acts as a dominant-negative inhibitor of TGF beta, suggesting that this protein may function as a mediator between TGF beta receptors and TAK1. This protein can also interact with and activate the mitogen-activated protein kinase 14 (MAPK14/p38alpha), and thus represents an alternative activation pathway, in addition to the MAPKK pathways, which contributes to the biological responses of MAPK14 to various stimuli. Alternatively spliced transcript variants encoding distinct isoforms have been reported. [provided by RefSeq, Jul 2008]

TAB1: May be an important signaling intermediate between TGFB receptors and MAP3K7/TAK1. May play an important role in mammalian embryogenesis. Interacts with XIAP and BIRC7. Interacts with TRAF6 and MAP3K7; during IL-1 signaling. Identified in the TRIKA2 complex composed of MAP3K7, TAB1 and TAB2. Ubiquitous. 2 isoforms of the human protein are produced by alternative splicing.

Protein type: Activator; Motility/polarity/chemotaxis

Chromosomal Location of Human Ortholog: 22q13.1

Cellular Component: cytoplasm; cytosol; endosome membrane; nucleoplasm

Molecular Function: enzyme activator activity; protein binding

Biological Process: activation of MAPK activity; activation of NF-kappaB transcription factor; I-kappaB kinase/NF-kappaB cascade; JNK cascade; MyD88-dependent toll-like receptor signaling pathway; stimulatory C-type lectin receptor signaling pathway