Nab1 and Nab2 are co-repressors that specifically interact with and repress transcription mediated by the three members of the NGFI-A (Egr-1, Krox24, zif/268) family of transcription factors [1]. This C-terminal region is found only in the Nab1 subfamily.

1: Nab1, a corepressor of NGFI-A (Egr-1), contains an active transcriptional repression domain. Swirnoff AH, Apel ED, Svaren J, Sevetson BR, Zimonjic DB, Popescu NC, Milbrandt J; Mol Cell Biol 1998;18:512-524. PMID:9418898