Transcription repressor that specifically binds the 5'-GGAG[GA]A[GA]A-3' consensus sequence. Represses transcription by recruiting the chromatin multiprotein complex NuRD to target promoters. Negatively regulates expression of EGFR, a gene involved in cell proliferation, survival and migration. Its ability to repress genes of the EGFR pathway suggest it may act as a tumor suppressor. Able to suppress breast carcinogenesis. Antagonizes the transcription repression by isoform 1 by competing for the binding of the NuRD complex. Does not bind DNA. Interacts with CHD4/Mi-2; the interaction is direct. Widely expressed. Down-regulated in breast carcinomas. Ubiquitinated in case of infection by HIV-1, leading to its degradation. Ubiquitination is mediated by the CUL4A-RBX1-DDB1-DCAF1/VPRBP complex that is hijacked by HIV-1 via interaction between HIV-1 Vpr and DCAF1/VPRBP. Extended N-terminus.