MAP2K4(redirected from MAPKK 4)
MAP2K4A gene on chromosome 17q11.2 that encodes a MAPK kinase belonging to a protein kinase signal transduction cascade. MAP2K4 is a dual-specificity kinase and an essential component of the MAP kinase signal transduction pathway. It is also an essential component of the stress-activated protein kinase/c-Jun N-terminal kinase (SAP/JNK) signalling pathway, which is involved in the mitochondrial death signalling pathway, including the release cytochrome c, leading to apoptosis. With MAP2K7/MKK7, it is the only known kinase to directly activate the SAP/JNKs MAPK8/JNK1, MAPK9/JNK2 and MAPK10/JNK3; whereas MAP2K7/MKK7 exclusively activates JNKs, MAP2K4/MKK4 also activates the p38 MAPKs MAPK11, MAPK12, MAPK13 and MAPK14. MAP2K4 is required for maintaining peripheral lymphoid homeostasis. It is widely expressed in tissues, especially in skeletal muscle.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.