Enables chromatin binding activity and transcription corepressor activity. Involved in cardiac muscle tissue development; negative regulation of transcription, DNA-templated; and skeletal muscle tissue development. Located in several cellular components, including autosome; nucleus; and sex chromosome. Is expressed in several structures, including central nervous system; dorsal root ganglion; eye; genitourinary system; and paraxial mesenchyme. Orthologous to human SIN3B (SIN3 transcription regulator family member B). [provided by Alliance of Genome Resources, Apr 2022]