1d93

STRUCTURAL VARIATION IN D(CTCTAGAG). IMPLICATIONS FOR PROTEIN-DNA INTERACTIONS

spinqualitylabelsall models 1d93, resolution 2.15Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1d93 is a 1 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Single-crystal X-ray diffraction techniques have been used to characterize the structure of the self-complementary DNA oligomer d(CTCTAGAG). The structure was refined to an R factor of 14.7% using data to 2.15-A resolution. The tetragonal unit cell, space group P4(3)2(1)2, has dimensions a = 42.53 and c = 24.33 A. The asymmetric unit consists of a single strand or four base pairs. Two strands, related by a crystallographic dyad axis, coil about each other to form a right-handed duplex. This octamer duplex has a mean helix rotation of 32 degrees, 11.3 base pairs per turn, an average rise of 3.1 A, C3'-endo furanose conformations, a shallow minor groove, and a deep major groove. Such averaged parameters suggest classification of the octamer as a member of the A-DNA family. However, the global parameters tend to mask variations in conformational parameters observed at the level of the base pairs. In particular, the central TpA (= TpA) step displays extensive interstrand purine-purine overlap and an unusual sugar-phosphate backbone conformation. These structural features may be directly related to certain sequence-specific protein-DNA interactions involving nucleases and repressors. Structural variation in d(CTCTAGAG). Implications for protein-DNA interactions.,Hunter WN, D'Estaintot BL, Kennard O Biochemistry. 1989 Mar 21;28(6):2444-51. PMID:2730875 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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