Myb-binding protein 1A (MYBBP1A)

May activate or repress transcription through connections with sequence specific DNA-binding proteins (By similarity). Repression could be mediated at least in part by histone deacetylase activity (HDAC activity) (By similarity).

Acts as a corepressor and in concert with CRY1, represses the transcription of the core circadian clock component PER2 (By similarity). Preferentially binds to dimethylated histone H3 'Lys-9' (H3K9me2) on the PER2 promoter (By similarity).