103D image
Deposition Date 1994-12-16
Release Date 1995-03-31
Last Version Date 2024-05-22
Entry Detail
PDB ID:
103D
Keywords:
DNA
Title:
THE UNUSUAL STRUCTURE OF THE HUMAN CENTROMERE (GGA)2 MOTIF: UNPAIRED GUANOSINE RESIDUES STACKED BETWEEN SHEARED G(DOT)A PAIRS
Biological Source:
Source Organism:
(Taxon ID: )
Method Details:
Experimental Method:
SOLUTION NMR
Conformers Submitted:
1
103D validation report
Macromolecular Entities
Polymer Type:polydeoxyribonucleotide
Molecule:DNA (5'-D(*GP*TP*GP*GP*AP*AP*TP*GP*GP*AP*AP*C)-3')
Chain IDs:A, B
Chain Length:12
Number of Molecules:2
Biological Source:
Ligand Molecules
NA
Primary Citation
The unusual structure of the human centromere (GGA)2 motif. Unpaired guanosine residues stacked between sheared G.A pairs.
J.Mol.Biol. 244 259 268 (1994)
PMID: 7966337 DOI: 10.1006/jmbi.1994.1727

Abstact

The centromere of human chromosomes contains multiple repeats of the DNA sequence d(TGGAA)n. This sequence has the interesting property of pairing with itself to form stable duplexes. We have determined the solution structure of the unusual DNA duplex 5'-TGGAATGGAA:TGGAATGGAA-3' at atomic resolution. The duplex contains unpaired staggered guanosine residues, which co-stack by intercalation between sheared G.A and A.G base-pairs to form an interesting new structural motif, the GA-bracketed G-stack. The TGGAA repeat unit contains six "steps", four of which are not Watson-Crick base-pairs.

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Disease

Primary Citation of related structures
103D