205D image
Deposition Date 1995-04-14
Release Date 1995-09-15
Last Version Date 2024-02-14
Entry Detail
PDB ID:
205D
Keywords:
RNA
Title:
STRUCTURE OF AN RNA DOUBLE HELIX INCLUDING URACIL-URACIL BASE PAIRS IN AN INTERNAL LOOP
Biological Source:
Source Organism:
Method Details:
Experimental Method:
X-RAY DIFFRACTION
Resolution:
2.64 Å
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 41
205D validation report
Macromolecular Entities
Polymer Type:polyribonucleotide
Molecule:RNA (5'-R(*GP*GP*AP*CP*UP*UP*UP*GP*GP*UP*CP*C)-3')
Chain IDs:A, B
Chain Length:12
Number of Molecules:2
Biological Source:
Primary Citation
Structure of an RNA double helix including uracil-uracil base pairs in an internal loop.
Nat.Struct.Biol. 2 56 62 (1995)
PMID: 7719854 DOI: 10.1038/nsb0195-56

Abstact

The crystal structure of the RNA dodecamer 5'-GGACUUUGGUCC-3' has been determined from X-ray diffraction data to 2.6 A resolution. This oligomer forms an asymmetric double helix in the crystal. Four consecutive non-Watson-Crick base-pairs are formed in the middle of the duplex including the first intrahelical U-U (or T-T) pairs observed in an oligonucleotide crystal structure. Two different conformations of U-U pairs are observed in the context of the surrounding sequence. One of these pairs is highly twisted, allowing a bound water to bridge across strands in the major groove. The crystal packing illustrates a new form of RNA helix-helix interaction.

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Primary Citation of related structures
205D