7ubu | pdb_00007ubu

Crystal structure of ZMET2 in complex with hemimethylated CAG DNA and a histone H3Kc9me2 peptide

spinqualitylabelsall models 7ubu, resolution 2.39Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 7ubu is a 5 chain structure with sequence from Zea mays. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.39Å Ligands: 5MC, C49, M2L, SAH Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function CMT1_MAIZE Publication Abstract from PubMed DNA methylation is an evolutionarily conserved epigenetic mechanism essential for transposon silencing and heterochromatin assembly. In plants, DNA methylation widely occurs in the CG, CHG, and CHH (H = A, C, or T) contexts, with the maintenance of CHG methylation mediated by CMT3 chromomethylase. However, how CMT3 interacts with the chromatin environment for faithful maintenance of CHG methylation is unclear. Here we report structure-function characterization of the H3K9me2-directed maintenance of CHG methylation by CMT3 and its Zea mays ortholog ZMET2. Base-specific interactions and DNA deformation coordinately underpin the substrate specificity of CMT3 and ZMET2, while a bivalent readout of H3K9me2 and H3K18 allosterically stimulates substrate binding. Disruption of the interaction with DNA or H3K9me2/H3K18 led to loss of CMT3/ZMET2 activity in vitro and impairment of genome-wide CHG methylation in vivo. Together, our study uncovers how the intricate interplay of CMT3, repressive histone marks, and DNA sequence mediates heterochromatic CHG methylation. Mechanistic basis for maintenance of CHG DNA methylation in plants.,Fang J, Jiang J, Leichter SM, Liu J, Biswal M, Khudaverdyan N, Zhong X, Song J Nat Commun. 2022 Jul 5;13(1):3877. doi: 10.1038/s41467-022-31627-3. PMID:35790763 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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