MAP3K5 Recombinant Rabbit mAb (S-4566-31)

MAP3K5, also known as apoptosis signal-regulating kinase 1 (ASK1), is a ubiquitously expressed mitogen-activated protein kinase kinase kinase that plays a critical role in signal integration in response to various stress signals, including oxidative stress, endoplasmic reticulum stress, TNF-α, and lipopolysaccharides. This protein consists of 1,374 amino acids and contains an N-terminal inhibitory domain, which binds to thioredoxin (Trx) under resting conditions to maintain a self-inhibitory conformation. Upon stimulation by elevated reactive oxygen species or calcium influx, thioredoxin undergoes oxidative dissociation, allowing MAP3K5 to be activated through oligomerization and phosphorylation at key sites (such as Thr-838). Activated MAP3K5 subsequently phosphorylates downstream MKK4/MKK7 and MKK3/MKK6, initiating the JNK and p38 MAPK classical signaling cascade pathways, ultimately regulating diverse biological processes including apoptosis, autophagy, differentiation, and inflammatory cytokine expression. The activity of MAP3K5 is finely regulated by phosphorylation, ubiquitination, and various chaperone proteins. Dysregulation of MAP3K5 function is closely associated with the pathogenesis and progression of neurodegenerative diseases (such as Parkinson's disease and amyotrophic lateral sclerosis), cardiovascular diseases (such as myocardial ischemia-reperfusion injury), metabolic diseases (such as non-alcoholic steatohepatitis), and multiple types of tumors. Consequently, MAP3K5 is considered a potential therapeutic target for numerous major diseases, and several small-molecule MAP3K5 inhibitors have already entered preclinical or clinical trial stages.