Enables enzyme binding activity. Contributes to transcription coactivator activity. Involved in cellular response to transforming growth factor beta stimulus; positive regulation of extrinsic apoptotic signaling pathway; and positive regulation of transcription by RNA polymerase II. Acts upstream of or within several processes, including apoptotic signaling pathway; osteoblast differentiation; and positive regulation of extrinsic apoptotic signaling pathway in absence of ligand. Located in mitochondrion and nucleus. Part of RNA polymerase II transcription regulator complex. Is expressed in several structures, including central nervous system; head mesenchyme derived from neural crest; musculoskeletal system; sensory organ; and spinal ganglion. Human ortholog(s) of this gene implicated in autosomal recessive spinocerebellar ataxia 12; developmental and epileptic encephalopathy 28; esophageal cancer; esophagus squamous cell carcinoma; and squamous cell carcinoma. Orthologous to human WWOX (WW domain containing oxidoreductase). [provided by Alliance of Genome Resources, Apr 2022]