244d: Difference between revisions

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{{STRUCTURE_244d|  PDB=244d  |  SCENE=  }}  
{{STRUCTURE_244d|  PDB=244d  |  SCENE=  }}  


'''THE HIGH-RESOLUTION CRYSTAL STRUCTURE OF A PARALLEL-STRANDED GUANINE TETRAPLEX'''
===THE HIGH-RESOLUTION CRYSTAL STRUCTURE OF A PARALLEL-STRANDED GUANINE TETRAPLEX===




==Overview==
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Repeat tracts of guanine bases found in DNA and RNA can form tetraplex structures in the presence of a variety of monovalent cations. Evidence suggests that guanine tetraplexes assume important functions within chromosomal telomeres, immunoglobulin switch regions, and the human immunodeficiency virus genome. The structure of a parallel-stranded tetraplex formed by the hexanucleotide d(TG4T) and stabilized by sodium cations was determined by x-ray crystallography to 1.2 angstroms resolution. Sharply resolved sodium cations were found between and within planes of hydrogen-bonded guanine quartets, and an ordered groove hydration was observed. Distinct intra- and intermolecular stacking arrangements were adopted by the guanine quartets. Thymine bases were exclusively involved in making extensive lattice contacts.
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{{ABSTRACT_PUBMED_8036494}}


==About this Structure==
==About this Structure==
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[[Category: Quadruple helix]]
[[Category: Quadruple helix]]
[[Category: Unusual dna]]
[[Category: Unusual dna]]
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May  3 18:22:27 2008''
 
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Revision as of 23:09, 27 July 2008

File:244d.png

Template:STRUCTURE 244d

THE HIGH-RESOLUTION CRYSTAL STRUCTURE OF A PARALLEL-STRANDED GUANINE TETRAPLEX

Template:ABSTRACT PUBMED 8036494

About this Structure

Full crystallographic information is available from OCA.

Reference

The high-resolution crystal structure of a parallel-stranded guanine tetraplex., Laughlan G, Murchie AI, Norman DG, Moore MH, Moody PC, Lilley DM, Luisi B, Science. 1994 Jul 22;265(5171):520-4. PMID:8036494

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