1mis

STRUCTURE OF RNA (5'-R(GP*CP*GP*GP*AP*CP*GP*C)-3') ANTI-PARALLEL RNA DUPLEX WITH TANDEM G:A MISMATCHES, NMR, MINIMIZED AVERAGE STRUCTURE

spinqualitylabelsall models 1mis, 1 NMR models Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 1mis is a 2 chain structure. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, RCSB, PDBsum Publication Abstract from PubMed The three-dimensional solution structure of the RNA self-complementary duplex [sequence: see text] was derived from two-dimensional NMR and the iterative relaxation matrix approach. Each GA mismatch forms two hydrogen bonds: A-NH6 to G-O6 and A-N1 to G-NH1 (imino). This is the first three-dimensional RNA structure with imino hydrogen-bonded tandem GA mismatches. This GA structure is totally different from the sheared tandem GA structure in [sequence: see text] which also has two hydrogen bonds: A-N7 to G-NH2 and A-NH6 to G-N3 [SantaLucia, J., Jr., & Turner, D. H. (1993) Biochemistry 32, 12612-12623]. In particular, the sheared and imino GA mismatches produce a narrowing and widening of the backbone, respectively. The results show that substitutions of Watson-Crick base pairs can have dramatic effects on the three-dimensional structures of adjacent non-Watson-Crick paired regions; i.e., the structure depends on sequence context. Thus compensating substitutions in site-directed mutagenesis experiments may not always restore biological activities. Solution structure of (rGCGGACGC)2 by two-dimensional NMR and the iterative relaxation matrix approach.,Wu M, Turner DH Biochemistry. 1996 Jul 30;35(30):9677-89. PMID:8703939 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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