Transcription factor that binds to the immunoglobulin enchancer Mu-E5/KE5-motif. Involved in the initiation of neuronal differentiation. Activates transcription by binding to the E box (5'-CANNTG-3'). Isoform 2 inhibits MYOD1 activation of the cardiac alpha-actin promoter. Binds to the E-box present in the somatostatin receptor 2 initiator element (SSTR2-INR) to activate transcription. May have a regulatory function in developmental processes as well as during neuronal plasticity.
Specificity
Natural and recombinant Mouse Transcription factor 4
Efficient DNA binding requires dimerization with another bHLH protein. Isoform 2 seems to form inactive heterodimers with MYOD1. Interacts with HIVEP2. Interacts with NEUROD2.