GO:0001226

Interacting selectively and non-covalently with an RNA polymerase II transcription corepressor, any protein involved in negative regulation of transcription by RNA polymerase II via protein-protein interactions with transcription factors and other proteins that negatively regulate transcription. Transcription corepressors do not bind DNA directly, but rather mediate protein-protein interactions between repressing transcription factors and the basal transcription machinery of RNA polymerase II. [GOC:krc]