MAP4K3 (also known as GLK) is a member of the STE20 family of serine/threonine protein kinases and contains N-terminal catalytic domain and C-terminal regulatory domain. MAP4K3 is upstream of the MEKK1 target and is stimulated by UV radiation and TNF-alpha and can lead to the activation of the JNK signaling pathway. MAP4K3 can directly activate PKC-Θ, during TCR signaling and people with systemic lupus erythematosus show considerable enhanced MAP4K3 expression and activation of PKC-Θ, and the kinase IKK in T cells. MAP4K3 can act as a pro-apoptotic kinase which orchestrates activation of BAX via the concerted posttranscriptional modulation of PUMA, BAD, and BIM. Recombinant human MAP4K3 (1-380) was expressed by baculovirus in Sf9 insect cells using an N-terminal GST tag.
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