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156d

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{{STRUCTURE_156d| PDB=156d | SCENE= }}
{{STRUCTURE_156d| PDB=156d | SCENE= }}
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'''REFINED SOLUTION STRUCTURE OF THE DIMERIC QUADRUPLEX FORMED FROM THE OXYTRICHA TELOMERIC OLIGONUCLEOTIDE D(GGGGTTTTGGGG)'''
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===REFINED SOLUTION STRUCTURE OF THE DIMERIC QUADRUPLEX FORMED FROM THE OXYTRICHA TELOMERIC OLIGONUCLEOTIDE D(GGGGTTTTGGGG)===
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==Overview==
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BACKGROUND: Telomeres, the structures at the ends of linear eukaryotic chromosomes, are essential for chromosome replication and stability. The telomeres of the unicellular ciliate Oxytricha contain a 3' single strand overhang composed of two repeats of the telomere repeat sequence d(TTTTGGGG). It has been proposed that oligonucleotides containing this repeat can form DNA quadruplexes via hydrogen bonding of the guanines into quartets. Such structures may be relevant to the biological function of the telomere, and in G-rich sequences elsewhere in the genome. RESULTS: We have previously determined from solution NMR data that the Oxy-1.5 Oxytricha repeat oligonucleotide d(GGGGTTTTGGGG) dimerizes to form an intermolecular quadruplex composed of four guanine quartets and with the thymines in loops across the diagonal at opposite ends of the quadruplex. We report here the refined solution structure of Oxy-1.5. This structure is compared with the previously published crystal structure of the same oligonucleotide. CONCLUSIONS: Oxy-1.5 forms a well-defined, symmetrical structure with ordered thymine loops. Both the solution and crystal structures of Oxy-1.5 are quadruplexes with alternating syn and anti glycosyl conformation of guanines along each strand of the helix and have thymine loops at opposite ends. However, the topology of the two structures is fundamentally different, leading to significant structural differences. A topological pathway for the formation and interconversion of the two structures is proposed.
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(as it appears on PubMed at http://www.pubmed.gov), where 8069635 is the PubMed ID number.
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{{ABSTRACT_PUBMED_8069635}}
==About this Structure==
==About this Structure==
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Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=156D OCA].
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Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=156D OCA].
==Reference==
==Reference==
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[[Category: Nmr]]
[[Category: Nmr]]
[[Category: Quadruplex]]
[[Category: Quadruplex]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Fri May 2 09:31:20 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jun 30 15:32:19 2008''

Revision as of 12:32, 30 June 2008

Image:156d.png

Template:STRUCTURE 156d

REFINED SOLUTION STRUCTURE OF THE DIMERIC QUADRUPLEX FORMED FROM THE OXYTRICHA TELOMERIC OLIGONUCLEOTIDE D(GGGGTTTTGGGG)

Template:ABSTRACT PUBMED 8069635

About this Structure

Full experimental information is available from OCA.

Reference

Refined solution structure of the dimeric quadruplex formed from the Oxytricha telomeric oligonucleotide d(GGGGTTTTGGGG)., Schultze P, Smith FW, Feigon J, Structure. 1994 Mar 15;2(3):221-33. PMID:8069635

Page seeded by OCA on Mon Jun 30 15:32:19 2008

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