Enables DNA-binding transcription activator activity, RNA polymerase II-specific and RNA polymerase II cis-regulatory region sequence-specific DNA binding activity. Involved in positive regulation of transcription by RNA polymerase II. Predicted to be located in cytoplasm and nucleus. Orthologous to human TSC22D1 (TSC22 domain family member 1). [provided by Alliance of Genome Resources, Apr 2022]