Predicted to enable peptide antigen binding activity; protein kinase binding activity; and transcription coactivator activity. Predicted to be involved in several processes, including atrioventricular node cell development; positive regulation of myotube differentiation; and positive regulation of transcription of Notch receptor target. Predicted to act upstream of or within Notch signaling pathway; myoblast differentiation; and positive regulation of transcription by RNA polymerase II. Predicted to be located in nucleus. Predicted to be part of MAML1-RBP-Jkappa- ICN1 complex. Predicted to be active in nucleoplasm. Orthologous to human MAML1 (mastermind like transcriptional coactivator 1). [provided by Alliance of Genome Resources, Apr 2022]