Enables ATP binding activity; JUN kinase kinase activity; and mitogen-activated protein kinase kinase kinase binding activity. Involved in several processes, including cellular response to sorbitol; positive regulation of JNK cascade; and positive regulation of macromolecule metabolic process. Located in several cellular components, including axon; dendrite cytoplasm; and perikaryon. Used to study transient cerebral ischemia. Human ortholog(s) of this gene implicated in colorectal cancer; ovarian serous carcinoma; pancreatic cancer; respiratory system cancer (multiple); and urinary bladder cancer. Orthologous to human MAP2K4 (mitogen-activated protein kinase kinase 4). [provided by Alliance of Genome Resources, Apr 2022]