Enables several functions, including DNA-binding transcription factor activity, RNA polymerase II-specific; enzyme binding activity; and phosphatidylinositol 3-kinase regulatory subunit binding activity. Involved in several processes, including cellular response to hexose stimulus; lipid homeostasis; and positive regulation of macromolecule metabolic process. Acts upstream of or within several processes, including cellular response to leukemia inhibitory factor; exocrine system development; and positive regulation of proteasomal protein catabolic process. Located in cytoplasm and nucleus. Is expressed in several structures, including alimentary system; brain; genitourinary system; sensory organ; and skeleton. Used to study inflammatory bowel disease. Orthologous to human XBP1 (X-box binding protein 1). [provided by Alliance of Genome Resources, Apr 2022]