383d | pdb_0000383d

Hydration and recognition of methylated CPG steps in DNA

spinqualitylabelsall models 383d, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 383d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: MG NonStd Res: 5CM Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed The analysis of the hydration pattern around methylated CpG steps in three high resolution (1.7, 2.15 and 2.2 A) crystal structures of A-DNA decamers reveals that the methyl groups of cytosine residues are well hydrated. In comparing the native structure with two structurally distinct forms of the decamer d(CCGCCGGCGG) fully methylated at its CpG steps, this study shows also that in certain structural and sequence contexts, the methylated cytosine base can be more hydrated that the unmodified one. These water molecules seem to be stabilized in front of the methyl group through the formation C-H...O interactions. In addition, these structures provide the first observation of magnesium cations bound to the major groove of A-DNA and reveal two distinct modes of metal binding in methylated and native duplexes. These findings suggest that methylated cytosine bases could be recognized by protein or DNA polar residues through their tightly bound water molecules. Hydration and recognition of methylated CpG steps in DNA.,Mayer-Jung C, Moras D, Timsit Y EMBO J. 1998 May 1;17(9):2709-18. PMID:9564052 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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