Enables transcription cis-regulatory region binding activity. Involved in positive regulation of transcription by RNA polymerase II; postsynapse to nucleus signaling pathway; and regulation of nervous system development. Located in nucleus. Is active in glutamatergic synapse. Is extrinsic component of postsynaptic density membrane. Orthologous to human RNF10 (ring finger protein 10). [provided by Alliance of Genome Resources, Apr 2022]