200d | pdb_0000200d

STABLE LOOP IN THE CRYSTAL STRUCTURE OF THE INTERCALATED FOUR-STRANDED CYTOSINE-RICH METAZOAN TELOMERE

spinqualitylabelsall models 200d, resolution 1.85Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 200d is a 2 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed In most metazoans, the telomeric cytosine-rich strand repeating sequence is d(TAACCC). The crystal structure of this sequence was solved to 1.9-A resolution. Four strands associate via the cytosine-containing parts to form a four-stranded intercalated structure held together by C.C+ hydrogen bonds. The base-paired strands are parallel to each other, and the two duplexes are intercalated into each other in opposite orientations. One TAA end forms a highly stabilized loop with the 5' thymine Hoogsteen-base-paired to the third adenine. The 5' end of this loop is in close proximity to the 3' end of one of the other intercalated cytosine strands. Instead of being entirely in a DNA duplex, this structure suggests the possibility of an alternative conformation for the cytosine-rich telomere strands. Stable loop in the crystal structure of the intercalated four-stranded cytosine-rich metazoan telomere.,Kang C, Berger I, Lockshin C, Ratliff R, Moyzis R, Rich A Proc Natl Acad Sci U S A. 1995 Apr 25;92(9):3874-8. PMID:7731999 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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