6aqx

Crystal Structure of Z-DNA with 6-fold Twinning_Z4B

spinqualitylabelsall models 6aqx, resolution 1.55Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 6aqx is a 8 chain structure with sequence from Synthetic construct. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.55Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed DNA oligomer duplexes containing alternating cytosines and guanines in their sequences tend to form left-handed helices of the Z-DNA type, with the sugar and phosphate backbone in a zigzag conformation and a helical repeat of two successive nucleotides. Z-DNA duplexes usually crystallize as hexagonally arranged parallel helical tubes, with various relative orientations and translation of neighboring duplexes. Four novel high-resolution crystal structures of d(CGCGCG)2 duplexes are described here. They are characterized by a high degree of pseudosymmetry and/or twinning, with three or four independent duplexes differently oriented in a monoclinic P21 lattice of hexagonal metric. The various twinning criteria give somewhat conflicting indications in these complicated cases of crystal pathology. The details of molecular packing in these crystal structures are compared with other known crystal forms of Z-DNA. Four highly pseudosymmetric and/or twinned structures of d(CGCGCG)2 extend the repertoire of crystal structures of Z-DNA.,Luo Z, Dauter Z, Gilski M Acta Crystallogr D Struct Biol. 2017 Nov 1;73(Pt 11):940-951. doi:, 10.1107/S2059798317014954. Epub 2017 Oct 30. PMID:29095165 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Z-DNA

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