1efo

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{{STRUCTURE_1efo| PDB=1efo | SCENE= }}
{{STRUCTURE_1efo| PDB=1efo | SCENE= }}
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'''CRYSTAL STRUCTURE OF AN ADENINE BULGE IN THE RNA CHAIN OF A DNA/RNA HYBRID, D(CTCCTCTTC)/R(GAAGAGAGAG)'''
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===CRYSTAL STRUCTURE OF AN ADENINE BULGE IN THE RNA CHAIN OF A DNA/RNA HYBRID, D(CTCCTCTTC)/R(GAAGAGAGAG)===
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==Overview==
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Crystal structure of a DNA.RNA hybrid, d(CTCCTCTTC).r(gaagagagag), with an adenine bulge in the polypurine RNA strand was determined at 2.3 A resolution. The structure was solved by the molecular replacement method and refined to a final R-factor of 19.9% (Rfree 22.2%). The hybrid duplex crystallized in the space group I222 with unit cell dimensions, a = 46.66 A, b = 47.61 A and c = 54.05 A, and adopts the A-form conformation. All RNA and DNA sugars are in the C3'-endo conformation, the glycosyl angles in anti conformation and the majority of the C4'-C5' torsion angles in g+ except two trans angles, in conformity with the C3'-endo rigid nucleotide hypothesis. The adenine bulge is looped out and it is also in the anti C3'-endo conformation. The bulge is involved in a base-triple (C.g)*a interaction with the end base-pair (C9.g10) in the minor groove of a symmetry-related molecule. The 2' hydroxyl group of g15 is hydrogen bonded to O2P and O5' of g17, skipping the bulged adenine a16 and stabilizing the sugar-phosphate backbone of the hybrid. The hydrogen bonding and the backbone conformation at the bulged adenine site is very similar to that found in the crystal structure of a protein-RNA complex.
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{{ABSTRACT_PUBMED_10860725}}
==About this Structure==
==About this Structure==
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[[Category: Looped out]]
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Revision as of 21:37, 30 June 2008

Image:1efo.png

Template:STRUCTURE 1efo

CRYSTAL STRUCTURE OF AN ADENINE BULGE IN THE RNA CHAIN OF A DNA/RNA HYBRID, D(CTCCTCTTC)/R(GAAGAGAGAG)

Template:ABSTRACT PUBMED 10860725

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structure of an adenine bulge in the RNA chain of a DNA.RNA hybrid, d(CTCCTCTTC).r(gaagagagag)., Sudarsanakumar C, Xiong Y, Sundaralingam M, J Mol Biol. 2000 May 26;299(1):103-12. PMID:10860725

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