ISDA: 2M1G

Deposition Date 2012-11-27

Release Date 2013-05-08

Last Version Date 2024-05-01

Entry Detail

PDB ID:

2M1G

Keywords:

DNA

Title:

Parallel human telomeric quadruplex containing 2'F-ANA substitutions

Biological Source:

Source Organism:

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Calculated:

Conformers Submitted:

Selection Criteria:

structures with the lowest energy

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Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Molecule:5'-D(*TP*AP*GP*GP*GP*TP*TP*AP*(GFL)P*GP*GP*T)-3'
Chain IDs:A, B
Chain Length:12
Number of Molecules:2
Biological Source:

Modified Residue

Compound ID	Chain ID	Parent Comp ID	Details	2D Image
GFL	A	DG	?

Ligand Molecules

Primary Citation

Dramatic effect of furanose c2' substitution on structure and stability: directing the folding of the human telomeric quadruplex with a single fluorine atom.

Martin-Pintado, N, Yahyaee-Anzahaee, M, Deleavey, G.F, Portella, G, Orozco, M, Damha, M.J, Gonzalez, C.Show

J.Am.Chem.Soc. 135 5344 5347 (2013)

PMID: 23521511 DOI: 10.1021/ja401954t

Abstact

Human telomeric DNA quadruplexes can adopt different conformations in solution. We have found that arabinose, 2'F-arabinose, and ribose substitutions stabilize the propeller parallel G-quadruplex form over competing conformers, allowing NMR structural determination of this particularly significant nucleic acid structure. 2'F-arabinose substitution provides the greatest stabilization as a result of electrostatic (F-CH---O4') and pseudo-hydrogen-bond (F---H8) stabilizing interactions. In contrast, 2'F-rG substitution provokes a dramatic destabilization of the quadruplex structure due to unfavorable electrostatic repulsion between the phosphate and the 2'-F.

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Protein

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Primary Citation of related structures