Predicted to enable chromatin DNA binding activity; histone H3-methyl-lysine-9 demethylase activity; and transcription coregulator activity. Predicted to be involved in histone H3-K9 demethylation and regulation of transcription by RNA polymerase II. Predicted to act upstream of or within chromatin organization. Predicted to be located in nucleoplasm. Predicted to be part of histone deacetylase complex. Predicted to be active in chromatin. Is expressed in central nervous system; early conceptus; oocyte; and retina nuclear layer. Orthologous to human KDM3B (lysine demethylase 3B).