Histone-binding protein, which is part of various corepressor complexes. Mediates the recruitment of corepressor complexes to target genes, followed by chromatin compaction and repression of transcription. Plays a role during myogenesis: required for the maintenance of undifferentiated states of myogenic progenitor cells via interaction with MYOD1. Interaction with MYOD1 leads to the recruitment of associated corepressors and silencing of MYOD1 target genes. Part of the SLC complex in germ cells, where it may play a role during spermatogenesis (By similarity). Interacts with MYOD1 (By similarity). Component of the SLC (SFMBT1-LSD1-CoREST) corepressor complex, which also contains KDM1A/LSD1 and RCOR1/CoREST. Interacts with KDM1A/LSD1 and RCOR1/CoREST. Interacts with MYOD1 (By similarity). Highly expressed in the testis, low expression was detected in brain, kidney, heart and lung. The MBT repeats mediate binding to histones tails; however, in contrast to other MBT repeats, does not bind specific histone lysine modifications. The MBT repeats lack the conserved Asp and aromatic cage at conserved positions (By similarity).