Acts as a transcriptional coactivator for NOTCH proteins. Has been shown to amplify NOTCH-induced transcription of HES1. Enhances phosphorylation and proteolytic turnover of the NOTCH intracellular domain in the nucleus through interaction with CDK8. Binds to CREBBP/CBP which promotes nucleosome acetylation at NOTCH enhancers and activates transcription. Induces phosphorylation and localization of CREBBP to nuclear foci. Plays a role in hematopoietic development by regulating NOTCH-mediated lymphoid cell fate decisions. Interacts (via N-terminus) with NOTCH1, NOTCH2, NOTCH3 and NOTCH4 (via ankyrin repeat region). Interacts (via N-terminus) with p53 (via DNA-binding region). Forms a DNA-binding complex with Notch proteins and RBPSUH/RBP-J kappa/CBF1. Also binds CREBBP/CBP and CDK8. Widely expressed with highest levels in heart, pancreas, peripheral blood leukocytes and spleen. Belongs to the mastermind family. Note: This description may include information from UniProtKB.
Protein type: Transcription, coactivator/corepressor
Molecular Function: protein binding; peptide antigen binding; transcription coactivator activity; protein kinase binding
Biological Process: myoblast differentiation; transcription initiation from RNA polymerase II promoter; Notch signaling pathway; positive regulation of transcription from RNA polymerase II promoter; gene expression; protein amino acid phosphorylation
SS: The number of records in which this modification site was determined using site-specific methods. SS methods include amino acid sequencing, site-directed mutagenesis, modification site-specific antibodies, specific MS strategies, etc.