Mitogen-activated protein kinase kinase kinase kinase 4; Serine/threonine kinase that may play a role in the response to environmental stress and cytokines such as TNF-alpha. Appears to act upstream of the JUN N-terminal pathway. Phosphorylates SMAD1 on Thr-322; Belongs to the protein kinase superfamily. STE Ser/Thr protein kinase family. STE20 subfamily.
Synonyms: MAP4K4, MAP4K4p, hMAP4K4, C9J840, E7EN19 ...