MAP3K5 gene coding for the protein is located on chromosome 6 at locus 6q22.33. and the transcribed protein contains 1,374 amino acids with 11 kinase subdomains. Northern blot analysis shows that MAP3K5 transcript is abundant in human heart and pancreas.
Under nonstress conditions ASK1 is oligomerized (a requirement for its activation) through its C-terminal coiled-coil domain (CCC), but remains in an inactive form by the suppressive effect of reduced thioredoxin (Trx) and calcium and integrin binding protein 1 (CIB1). Trx inhibits ASK1 kinase activity by direct binding to its N-terminal coiled-coil domain (NCC). Trx and CIB1 regulate ASK1 activation in a redox- or calcium- sensitive manner, respectively. Both appear to compete with TNF-α receptor-associated factor 2 (TRAF2), an ASK1 activator. TRAF2 and TRAF6 are then recruited to ASK1 to form a larger molecular mass complex. Subsequently, ASK1 forms homo-oligomeric interactions not only through the CCC, but also the NCC, which leads to full activation of ASK1 through autophosphorylation at threonine 845.
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