1gqu

Crystal structure of an alternating A-T oligonucleotide fragment with Hoogsteen base pairing

spinqualitylabelsall models 1gqu, resolution 2.50Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1gqu is a 4 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2.5Å Ligands: BRU Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed We report here an alternative double-helical structure of the DNA molecule. It has been found in the d(ATA(Br)UAT) and d(ATATAT) sequences by single-crystal x-ray crystallography. This sequence is found not only in TATA boxes, but also in other regulatory regions of DNA. Bases of the two antiparallel strands form Hoogsteen pairs, with adenines in the syn conformation. The structure is related neither to those found in triple helices nor to parallel DNA duplexes. Its conformational parameters are very similar to those of duplex DNA in the B form. Both forms may coexist under physiological conditions, although the Hoogsteen pairing greatly influences the recognition sites on DNA. Our results demonstrate that an alternative to the classical B-DNA double helix is possible. Crystal structure of an antiparallel DNA fragment with Hoogsteen base pairing.,Abrescia NG, Thompson A, Huynh-Dinh T, Subirana JA Proc Natl Acad Sci U S A. 2002 Mar 5;99(5):2806-11. PMID:11880632 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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