1BAE

STRUCTURE OF DNA (5'-D 5MCCTTTACC-3')2, NMR, 1 STRUCTURE

• PDB DOI: https://doi.org/10.2210/pdb1BAE/pdb
• NAKB: 1BAE

• Classification: DNA
• Organism(s): synthetic construct
• Mutation(s): No 


• Deposited: 1997-07-28 Released: 1998-01-14 
• Deposition Author(s): Nonin, S., Tuan, A.P., Leroy, J.L.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 1 
• Selection Criteria: structures with the least restraint violations 

Literature

Solution structure and base pair opening kinetics of the i-motif dimer of d(5mCCTTTACC): a noncanonical structure with possible roles in chromosome stability.

Nonin, S., Phan, A.T., Leroy, J.L.

(1997) Structure 5: 1231-1246

• PubMed: 9331414 
• DOI: https://doi.org/10.1016/s0969-2126(97)00273-6
• Primary Citation of Related Structures:  
  1BAE


• PubMed Abstract: 
  

  Repetitive cytosine-rich DNA sequences have been identified in telomeres and centromeres of eukaryotic chromosomes. These sequences play a role in maintaining chromosome stability during replication and may be involved in chromosome pairing during meiosis. The C-rich repeats can fold into an 'i-motif' structure, in which two parallel-stranded duplexes with hemiprotonated C.C+ pairs are intercalated. Previous NMR studies of naturally occurring repeats have produced poor NMR spectra. This led us to investigate oligonucleotides, based on natural sequences, to produce higher quality spectra and thus provide further information as to the structure and possible biological function of the i-motif.

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Organizational Affiliation: 

Groupe de Biophysique, de l'Ecole Polytechnique et de l'URA, CNRS, Palaiseau, France.

Biological Assembly 1  

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 4.54 kDa 
• Atom Count: 310 
• Modelled Residue Count: 16 
• Deposited Residue Count: 16 
• Unique nucleic acid chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Length	Organism	Image
DNA (5'-D(*MCYP*CP*TP*TP*TP*AP*CP*C)-3')	A, B	8	synthetic construct

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 1 
• Selection Criteria: structures with the least restraint violations 

Structure Validation

Entry History 

Deposition Data

• Released Date: 1998-01-14 
Deposition Author(s): Nonin, S., Tuan, A.P., Leroy, J.L.

Revision History  

• Version 1.0: 1998-01-14
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance
• Version 1.3: 2018-03-14
  Changes: Data collection, Database references, Derived calculations, Experimental preparation, Other, Source and taxonomy
• Version 1.4: 2024-04-10
  Changes: Data collection, Database references, Derived calculations