Isoform 3 lacks active site residues and therefore is catalytically inactive. Represses MEF2-dependent transcription by recruiting HDAC1 and/or HDAC3. Seems to inhibit skeletal myogenesis and to be involved in heart development. Protects neurons from apoptosis, both by inhibiting JUN phosphorylation by MAPK10 and by repressing JUN transcription via HDAC1 recruitment to JUN promoter.
Specificity
Natural and recombinant Human Histone deacetylase 9
Homodimer. Interacts with CTBP1. The phosphorylated form interacts with 14-3-3 (By similarity). Interacts with HDAC1 and HDAC3, and probably with HDAC4 and HDAC5. Interacts with MEF2, MAPK10, ETV6, NCOR1 and BCL6.