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| | {{STRUCTURE_315d| PDB=315d | SCENE= }} | | {{STRUCTURE_315d| PDB=315d | SCENE= }} |
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| - | '''CRYSTAL STRUCTURE OF AN ALTERNATING OCTAMER R(GUAUGUA)D(C) WITH ADJACENT G-U WOBBLE PAIRS'''
| + | ===CRYSTAL STRUCTURE OF AN ALTERNATING OCTAMER R(GUAUGUA)D(C) WITH ADJACENT G-U WOBBLE PAIRS=== |
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| - | ==Overview==
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| - | The crystal structure of the RNA duplex, r(GUAUGUA)dC, with a 3'-terminal deoxy C residue, has been determined at 1.38 A resolution. The r(GUAUGU) hexameric consensus sequence is present at the exon-intron junction in pre-mRNAs of yeast and higher eukaryotic organisms. The crystal belongs to the rhombohedral space group R3. The hexagonal unit cell dimensions are a = b = 39.71 A, c = 68.15 A and gamma = 120 degrees with one duplex in the asymmetric unit. The structure was solved using the molecular replacement method. The final model contains 332 atoms of the duplex and 67 solvent molecules. The R-factor is 17.6% (Rfree of 23.1%) for 4035 reflections with F > or = 1.5sigma(F) in the resolution range 10.0 to 1.38 A. The duplex is of the A-type with a pseudodyad relating the two strands. The RNA helix is slightly distorted, in spite of the presence of two adjacent G x U wobble base-pairs located at the center of the helix. The twist angle between the wobble pairs, 38.1 degrees, is above the average value and those between the wobble base-pairs and the flanking Watson-Crick base-pairs, 26.7 degrees and 26.3 degrees, respectively, are lower than the average values. The twist between the junction base-pairs are about 24 degrees. The G x U wobble pairs are bridged by water molecules and solvated in the grooves. G x U base-pairs are as stable as the Watson-Crick A x U pairs and only slightly less stable than the G x C pairs accounting for their frequent occurrence in RNA. | + | The line below this paragraph, {{ABSTRACT_PUBMED_9150403}}, adds the Publication Abstract to the page |
| | + | (as it appears on PubMed at http://www.pubmed.gov), where 9150403 is the PubMed ID number. |
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| | + | {{ABSTRACT_PUBMED_9150403}} |
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| | ==About this Structure== | | ==About this Structure== |
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| | [[Category: A-dna/rna]] | | [[Category: A-dna/rna]] |
| | [[Category: Double helix]] | | [[Category: Double helix]] |
| - | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun May 4 20:15:21 2008'' | + | |
| | + | ''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 04:57:12 2008'' |
Revision as of 01:57, 28 July 2008
Template:STRUCTURE 315d
CRYSTAL STRUCTURE OF AN ALTERNATING OCTAMER R(GUAUGUA)D(C) WITH ADJACENT G-U WOBBLE PAIRS
Template:ABSTRACT PUBMED 9150403
About this Structure
Full crystallographic information is available from OCA.
Reference
Crystal structure of an alternating octamer r(GUAUGUA)dC with adjacent G x U wobble pairs., Biswas R, Wahl MC, Ban C, Sundaralingam M, J Mol Biol. 1997 Apr 18;267(5):1149-56. PMID:9150403
Page seeded by OCA on Mon Jul 28 04:57:12 2008
