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1mf5

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{{STRUCTURE_1mf5| PDB=1mf5 | SCENE= }}
{{STRUCTURE_1mf5| PDB=1mf5 | SCENE= }}
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'''GCATGCT Quadruplex'''
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===GCATGCT Quadruplex===
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==Overview==
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Here we report the crystal structure of the DNA heptanucleotide sequence d(GCATGCT) determined to a resolution of 1.1 A. The sequence folds into a complementary loop structure generating several unusual base pairings and is stabilised through cobalt hexammine and highly defined water sites. The single stranded loop is bound together through the G(N2)-C(O2) intra-strand H-bonds for the available G/C residues, which form further Watson-Crick pairings to a complementary sequence, through 2-fold symmetry, generating a pair of non-planar quadruplexes at the heart of the structure. Further, four adenine residues stack in pairs at one end, H-bonding through their N7-N6 positions, and are additionally stabilised through two highly conserved water positions at the structural terminus. This conformation is achieved through the rotation of the central thymine base at the pinnacle of the loop structure, where it stacks with an adjacent thymine residue within the lattice. The crystal packing yields two halved biological units, each related across a 2-fold symmetry axis spanning a cobalt hexammine residue between them, which stabilises the quadruplex structure through H-bonds to the phosphate oxygens and localised hydration.
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(as it appears on PubMed at http://www.pubmed.gov), where 12560479 is the PubMed ID number.
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{{ABSTRACT_PUBMED_12560479}}
==About this Structure==
==About this Structure==
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[[Category: Atomic resolution]]
[[Category: Atomic resolution]]
[[Category: Quadruplex]]
[[Category: Quadruplex]]
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Revision as of 20:50, 2 July 2008

Image:1mf5.png

Template:STRUCTURE 1mf5

GCATGCT Quadruplex

Template:ABSTRACT PUBMED 12560479

About this Structure

Full crystallographic information is available from OCA.

Reference

Crystal structure of the complementary quadruplex formed by d(GCATGCT) at atomic resolution., Thorpe JH, Teixeira SC, Gale BC, Cardin CJ, Nucleic Acids Res. 2003 Feb 1;31(3):844-9. PMID:12560479

Page seeded by OCA on Wed Jul 2 23:50:07 2008

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