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MEKK2 is a Ser/Thr protein kinase belonging to the MEKK/STE11 subgroup of the MAP/ERK kinase kinase family (1). Closely related to MEKK3, MEKK2 is expressed in a multitude of tissues. MEKK2 directly phosphorylates and activates Ikappa B kinases and has been found to bind and activate protein kinase C-related kinase 2 (2). MEKK2 has also been known to activate JNK1/2, ERK1/2, p38, and ERK5 MAPK in vitro (3). MEKK2 interacting protein (Mip1) regulates MEKK2 expression (4).