Enables DNA-binding transcription factor activity, RNA polymerase II-specific. Involved in positive regulation of gene expression and positive regulation of transcription by RNA polymerase II. Acts upstream of or within negative regulation of transcription by RNA polymerase II. Located in nucleus. Orthologous to human POU3F3 (POU class 3 homeobox 3). [provided by Alliance of Genome Resources, Apr 2022]