Enables chromatin binding activity. Involved in negative regulation of transcription, DNA-templated and white fat cell differentiation. Acts upstream of or within negative regulation of transcription by RNA polymerase II. Located in nucleus. Part of transcription repressor complex. Is active in GABA-ergic synapse; glutamatergic synapse; and presynaptic active zone cytoplasmic component. Is expressed in several structures, including central nervous system; genitourinary system; limb; lung; and neural retina. Orthologous to human CTBP1 (C-terminal binding protein 1). [provided by Alliance of Genome Resources, Apr 2022]