Predicted to enable methylated histone binding activity and transcription cis-regulatory region binding activity. Predicted to contribute to histone methyltransferase activity (H3-K4 specific). Predicted to be involved in histone H3-K4 methylation and response to estrogen. Predicted to act upstream of or within cellular response to DNA damage stimulus. Predicted to be located in nucleolus and nucleoplasm. Predicted to be part of MLL1 complex; MLL3/4 complex; and Set1C/COMPASS complex. Orthologous to human RBBP5 (RB binding protein 5, histone lysine methyltransferase complex subunit). [provided by Alliance of Genome Resources, Apr 2022]