This is the N-terminal domain found in Zmiz1 proteins (Zinc finger MIZ domain-containing protein 1). Zmiz1 is a direct Notch1 cofactor that heterogeneously regulates Notch target genes. Zmiz1 directly interacts with the RAM1 domain of Notch1 through this N-terminal tetratricopeptide repeat (TPR) domain. Furthermore, it has been shown that Zmiz1 and Notch1 cooperatively recruit each other to chromatin through direct interaction via the N-terminal TPR domain resulting in a slight increase in activating histone marks and decrease of repressive histone marks. Functional analysis indicate that the N-Terminal Domain of Zmiz1 is important for driving Myc transcription and proliferation indirectly [1].

1: The PIAS-like Coactivator Zmiz1 Is a Direct and Selective Cofactor of Notch1 in T Cell Development and Leukemia. Pinnell N, Yan R, Cho HJ, Keeley T, Murai MJ, Liu Y, Alarcon AS, Qin J, Wang Q, Kuick R, Elenitoba-Johnson KS, Maillard I, Samuelson LC, Cierpicki T, Chiang MY; Immunity. 2015;43:870-883. PMID:26522984