Transcriptional repressor that binds E-box motif CAGGTG. Can modulate the action of basic helix-loop-helix (bHLH) transcription factors, critical for neuronal differentiation. Interacts (via SNAG domain) with LIMD1 (via LIM domains), WTIP (via LIM domains) and AJUBA (via LIM domains). Brain specific. The N-terminal non zinc-finger region mediates the repressor activity. Belongs to the snail C2H2-type zinc-finger protein family.