5VXQ

X-Ray crystallography structure of the parallel stranded duplex formed by 5-rA5-dA-rA5

PDB DOI: https://doi.org/10.2210/pdb5VXQ/pdb
NAKB: 5VXQ

Classification: RNA, DNA
Organism(s): synthetic construct
Mutation(s): No

Deposited: 2017-05-23 Released: 2017-08-16
Deposition Author(s): Xie, J., Chen, Y., Wei, X., Kozlov, G., Gehring, K.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.00 Å
R-Value Free: 0.160
R-Value Work: 0.129

wwPDB Validation 3D Report Full Report

This is version 1.3 of the entry. See complete history.

Literature

Influence of nucleotide modifications at the C2' position on the Hoogsteen base-paired parallel-stranded duplex of poly(A) RNA.

Copp, W., Denisov, A.Y., Xie, J., Noronha, A.M., Liczner, C., Safaee, N., Wilds, C.J., Gehring, K.

(2017) Nucleic Acids Res 45: 10321-10331

PubMed: 28973475 Search on PubMedSearch on PubMed Central
DOI: https://doi.org/10.1093/nar/gkx713
Primary Citation of Related Structures:
5TGG, 5VXQ

PubMed Abstract:
Polyadenylate (poly(A)) has the ability to form a parallel duplex with Hoogsteen adenine:adenine base pairs at low pH or in the presence of ammonium ions. In order to evaluate the potential of this structural motif for nucleic acid-based nanodevices, we characterized the effects on duplex stability of substitutions of the ribose sugar with 2'-deoxyribose, 2'-O-methyl-ribose, 2'-deoxy-2'-fluoro-ribose, arabinose and 2'-deoxy-2'-fluoro-arabinose. Deoxyribose substitutions destabilized the poly(A) duplex both at low pH and in the presence of ammonium ions: no duplex formation could be detected with poly(A) DNA oligomers. Other sugar C2' modifications gave a variety of effects. Arabinose and 2'-deoxy-2'-fluoro-arabinose nucleotides strongly destabilized poly(A) duplex formation. In contrast, 2'-O-methyl and 2'-deoxy-2'-fluoro-ribo modifications were stabilizing either at pH 4 or in the presence of ammonium ions. The differential effect suggests they could be used to design molecules selectively responsive to pH or ammonium ions. To understand the destabilization by deoxyribose, we determined the structures of poly(A) duplexes with a single DNA residue by nuclear magnetic resonance spectroscopy and X-ray crystallography. The structures revealed minor structural perturbations suggesting that the combination of sugar pucker propensity, hydrogen bonding, pKa shifts and changes in hydration determine duplex stability.

Organizational Affiliation

Department of Chemistry and Biochemistry, Concordia University, Montréal, Québec H4B 1R6, Canada.

Macromolecule Content

Total Structure Weight: 7.45 kDa
Atom Count: 565
Modelled Residue Count: 22
Deposited Residue Count: 22
Unique hybrid chains: 1

Macromolecules

Find similar nucleic acids by: Sequence | 3D Structure

Entity ID: 1
Molecule	Chains	Length	Organism	Image
DNA/RNA (5'-R(APAPAPAPA)-D(PA)-R(PAPAPAPAP*A)-3')	A, B	11	synthetic construct
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
NH4 Query on NH4 Download Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain D [auth A] SDF format, chain E [auth A] SDF format, chain F [auth A] SDF format, chain G [auth A] SDF format, chain H [auth A] SDF format, chain I [auth A] SDF format, chain J [auth A] SDF format, chain K [auth A] SDF format, chain L [auth A] SDF format, chain M [auth A] SDF format, chain N [auth A] SDF format, chain O [auth B] SDF format, chain P [auth B] SDF format, chain Q [auth B] SDF format, chain R [auth B] SDF format, chain S [auth B] SDF format, chain T [auth B] MOL2 format, chain C [auth A] MOL2 format, chain D [auth A] MOL2 format, chain E [auth A] MOL2 format, chain F [auth A] MOL2 format, chain G [auth A] MOL2 format, chain H [auth A] MOL2 format, chain I [auth A] MOL2 format, chain J [auth A] MOL2 format, chain K [auth A] MOL2 format, chain L [auth A] MOL2 format, chain M [auth A] MOL2 format, chain N [auth A] MOL2 format, chain O [auth B] MOL2 format, chain P [auth B] MOL2 format, chain Q [auth B] MOL2 format, chain R [auth B] MOL2 format, chain S [auth B] MOL2 format, chain T [auth B]	C [auth A] D [auth A] E [auth A] F [auth A] G [auth A] C [auth A], D [auth A], E [auth A], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth A], O [auth B], P [auth B], Q [auth B], R [auth B], S [auth B], T [auth B]	AMMONIUM ION H₄ N QGZKDVFQNNGYKY-UHFFFAOYSA-O		Interactions Focus chain C [auth A] Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A] Focus chain M [auth A] Focus chain N [auth A] Focus chain O [auth B] Focus chain P [auth B] Focus chain Q [auth B] Focus chain R [auth B] Focus chain S [auth B] Focus chain T [auth B] Interactions & Density Focus chain C [auth A] Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A] Focus chain M [auth A] Focus chain N [auth A] Focus chain O [auth B] Focus chain P [auth B] Focus chain Q [auth B] Focus chain R [auth B] Focus chain S [auth B] Focus chain T [auth B]