5fhj

Extensive amphimorphism in DNA: Three stable conformations for the decadeoxynucleotide d(GCATGCATGC)

spinqualitylabelsall models 5fhj, resolution 1.68Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5fhj is a 4 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 1.68Å Ligands: CO Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed High-resolution structures of DNA fragments determined using X-ray crystallography or NMR have provided descriptions of a veritable alphabet of conformations. They have also shown that DNA is a flexible molecule, with some sequences capable of adopting two different structures. Here, the first example is presented of a DNA fragment that can assume three different and distinct conformations in crystals. The decanucleotide d(GCATGCATGC) was previously reported to assume a single-stranded double-fold structure. In one of the two crystal structures described here the decamer assumes both the double-fold conformation and, simultaneously, the more conventional B-type double-helical structure. In the other crystal the sequence assumes the A-type double-helical conformation. These results, taken together with CD spectra, which were recorded as the decamer was titrated against four metal ions and spermine, indicate that the molecule may exist as a mixed population of structures in solution. Small differences in the environmental conditions, such as the concentration of metal ion, may decide which of these crystallizes out. The results also support the idea that it may be possible for DNA to change its structure to suit the binding requirements of proteins or drugs. DNA polymorphism in crystals: three stable conformations for the decadeoxynucleotide d(GCATGCATGC).,Thirugnanasambandam A, Karthik S, Artheswari G, Gautham N Acta Crystallogr D Struct Biol. 2016 Jun 1;72(Pt 6):780-8. doi:, 10.1107/S2059798316006306. Epub 2016 May 25. PMID:27303798 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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