This is the N-terminal domain of DNTTIP1, a protein that forms part of a novel histone deacetylase complex present in Homo sapiens. Histone deacetylase complexes comprise DNTTIP1, histone deacetylase (HDAC) and the repressor protein MIDEAS. The acetylation of histone tails plays a critical role in determining the accessibility of chromatin to transcriptional regulators and RNA polymerase complexes. This N-terminal domain is responsible for dimerization of histone deacetylase 1(HDAC1). The N-terminal domain also interacts and mediates the assembly of the HDAC1- MIDEAS complex [1].

1: Structural and functional characterization of a cell cycle associated HDAC1/2 complex reveals the structural basis for complex assembly and nucleosome targeting. Itoh T, Fairall L, Muskett FW, Milano CP, Watson PJ, Arnaudo N, Saleh A, Millard CJ, El-Mezgueldi M, Martino F, Schwabe JW; Nucleic Acids Res. 2015;43:2033-2044. PMID:25653165