2rc4 | pdb_00002rc4
Crystal Structure of the HAT domain of the human MOZ protein
Structural highlights
Disease[KAT6A_HUMAN] Note=Chromosomal aberrations involving KAT6A may be a cause of acute myeloid leukemias. Translocation t(8;16)(p11;p13) with CREBBP; translocation t(8;22)(p11;q13) with EP300. KAT6A-CREBBP may induce leukemia by inhibiting RUNX1-mediated transcription. Inversion inv(8)(p11;q13) generates the KAT6A-NCOA2 oncogene, which consists of the N-terminal part of KAT6A and the C-terminal part of NCOA2/TIF2. KAT6A-NCOA2 binds to CREBBP and disrupts its function in transcription activation. Note=A chromosomal aberration involving KAT6A is a cause of therapy-related myelodysplastic syndrome. Translocation t(2;8)(p23;p11.2) with ASXL2 generates a KAT6A-ASXL2 fusion protein. Function[KAT6A_HUMAN] Histone acetyltransferase that acetylates lysine residues in histone H3 and histone H4 (in vitro). Component of the MOZ/MORF complex which has a histone H3 acetyltransferase activity. May act as a transcriptional coactivator for RUNX1 and RUNX2.[1] [2] [3] [4] [5] Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedThe human monocytic leukemia zinc finger (MOZ) protein is an essential transcriptional coactivator and histone acetyltransferase (HAT) that plays a primary role in the differentiation of erythroid and myeloid cells and is required to maintain hematopoietic stem cells. Chromosomal translocations involving the HAT-encoded region are also associated with acute myeloid leukemia. Here we present the x-ray crystal structure of the MOZ HAT domain and related biochemical studies. We find that the HAT domain contains a central region that is structurally and functionally conserved with the yeast MYST HAT protein Esa1, but contains more divergent N- and C-terminal regions harboring a TFIIIA-type zinc finger and helix-turn-helix DNA-binding motifs. Solution DNA-binding and acetyltransferase activity assays, in concert with mutagenesis, confirm that the MOZ HAT domain binds strongly to DNA through the zinc finger and helix-turn-helix motifs and that DNA binding and catalysis are not mutually exclusive. Consistent with the DNA-binding properties of MOZ, we also show that MOZ is able to acetylate nucleosomes and free histones equally well, whereas other HATs prefer free histones. Our results reveal, for the first time, that enzymatic and DNA-targeting activities can be contained within the same chromatin regulatory domain. The human monocytic leukemia zinc finger histone acetyltransferase domain contains DNA-binding activity implicated in chromatin targeting.,Holbert MA, Sikorski T, Carten J, Snowflack D, Hodawadekar S, Marmorstein R J Biol Chem. 2007 Dec 14;282(50):36603-13. Epub 2007 Oct 9. PMID:17925393[6] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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