ISDA: 1EVO

Deposition Date 2000-04-20

Release Date 2000-05-01

Last Version Date 2024-05-22

Entry Detail

PDB ID:

1EVO

Keywords:

DNA

Title:

NMR OBSERVATION OF A NOVEL C-TETRAD

Biological Source:

Source Organism:

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Calculated:

Conformers Submitted:

Selection Criteria:

all calculated structures submitted

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Macromolecular Entities

Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*TP*GP*GP*GP*CP*GP*GP*T)-3')
Chain IDs:A (auth: O), B (auth: P), C (auth: Q), D (auth: R)
Chain Length:8
Number of Molecules:4
Biological Source:

Ligand Molecules

Primary Citation

NMR observation of a novel C-tetrad in the structure of the SV40 repeat sequence GGGCGG.

Patel, P.K, Bhavesh, N.S, Hosur, R.V.Show

Biochem.Biophys.Res.Commun. 270 967 971 (2000)

PMID: 10772934 DOI: 10.1006/bbrc.2000.2479

Abstact

We report the NMR structure of the DNA sequence d-TGGGCGGT in Na(+) solutions at neutral pH, containing a repeat sequence from SV40 viral genome. The structure is a novel quadruplex incorporating the C-tetrad formed by symmetrical pairing of four Cs via NH(2)&bond;O(2) H-bonds in a plane. The C-tetrad has a wider cavity compared to G-tetrads and stacks well over the adjacent G4-tetrad, but poorly on the G6 tetrad. The quadruplex helix is largely underwound by 8-10 degrees compared to B-DNA except at the C5-G6 step. To our knowledge this is the first report of C-tetrad formation in DNA structures, and would be of significance from the point of view of both structural diversity and specific recognition.

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Primary Citation of related structures