Transcriptional regulator. Involved in the initiation of neuronal differentiation. Heterodimers between TCF3 and tissue-specific basic helix-loop-helix (bHLH) proteins play major roles in determining tissue-specific cell fate during embryogenesis, like muscle or early B-cell differentiation. Dimers bind DNA on E-box motifs: 5'-CANNTG-3'. Binds to the kappa-E2 site in the kappa immunoglobulin gene enhancer. Binds to IEB1 and IEB2, which are short DNA sequences in the insulin gene transcription control region.
Specificity
Natural and recombinant Mouse Transcription factor E2-alpha
Forms a heterodimer with TWIST2. Forms a heterodimer with NEUROD1; the heterodimer is inhibited in presence of ID2, but not NR0B2, to E-box element. Isoform E12 interacts with RALGAPA1 and FIGLA. Interacts with EP300. Efficient DNA binding requires dimerization with another bHLH protein (By similarity). Homodimer. Heterodimer. Interacts with PTF1A, TGFB1I1 and UBE2I. Component of a nuclear TAL-1 complex composed at least of CBFA2T3, LDB1, TAL1 and TCF3. Interacts with NEUROD2.