ISDA: 2KM3

Deposition Date 2009-07-17

Release Date 2009-11-03

Last Version Date 2024-05-01

Entry Detail

PDB ID:

2KM3

Keywords:

DNA

Title:

Structure of an intramolecular G-quadruplex containing a G.C.G.C tetrad formed by human telomeric variant CTAGGG repeats

Biological Source:

Source Organism:

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Calculated:

100

Conformers Submitted:

Selection Criteria:

back calculated data agree with experimental NOESY spectrum

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Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*AP*GP*GP*GP*CP*TP*AP*GP*GP*GP*CP*TP*AP*GP*GP*GP*CP*TP*AP*GP*GP*G)-3')
Chain IDs:A
Chain Length:22
Number of Molecules:1
Biological Source:

Ligand Molecules

Primary Citation

Sequence variant (CTAGGG)n in the human telomere favors a G-quadruplex structure containing a G.C.G.C tetrad

Lim, K.W, Alberti, P, Guedin, A, Lacroix, L, Riou, J.F, Royle, N.J, Mergny, J.L, Phan, A.T.Show

Nucleic Acids Res. 37 6239 6248 (2009)

PMID: 19692585 DOI: 10.1093/nar/gkp630

Abstact

Short contiguous arrays of variant CTAGGG repeats in the human telomere are unstable in the male germline and somatic cells, suggesting formation of unusual structures by this repeat type. Here, we report on the structure of an intramolecular G-quadruplex formed by DNA sequences containing four human telomeric variant CTAGGG repeats in potassium solution. Our results reveal a new robust antiparallel G-quadruplex fold involving two G-tetrads sandwiched between a G.C base pair and a G.C.G.C tetrad, which could represent a new platform for drug design targeted to human telomeric DNA.

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Primary Citation of related structures