2OOM

NMR structure of a kissing complex formed between the TAR RNA element of HIV-1 and a LNA/RNA aptamer


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 12 
  • Selection Criteria: The submitted structures are the 12 structures with zero violation on NOE distance, dihedral and with the lowest energy. 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

NMR structure of a kissing complex formed between the TAR RNA element of HIV-1 and a LNA-modified aptamer

Lebars, I.Richard, T.Di Primo, C.Toulme, J.J.

(2007) Nucleic Acids Res. 35: 6103-6114

  • DOI: 10.1093/nar/gkm655
  • Primary Citation of Related Structures:  2PN9

  • PubMed Abstract: 
  • The trans-activating responsive (TAR) RNA element located in the 5' untranslated region of the HIV-1 genome is a 57-nt imperfect stem-loop essential for the viral replication. TAR regulates transcription by interacting with both viral and cellular pr ...

    The trans-activating responsive (TAR) RNA element located in the 5' untranslated region of the HIV-1 genome is a 57-nt imperfect stem-loop essential for the viral replication. TAR regulates transcription by interacting with both viral and cellular proteins. RNA hairpin aptamers specific for TAR were previously identified by in vitro selection [Ducongé,F. and Toulmé,J.J. (1999) In vitro selection identifies key determinants for loop-loop interactions: RNA aptamers selective for the TAR RNA element of HIV-1. RNA, 5, 1605-1614]. These aptamers display a 5'-GUCCCAGA-3' consensus apical loop, partially complementary to the TAR one, leading to the formation of a TAR-aptamer kissing complex. The conserved GA combination (underlined in the consensus sequence) has been shown to be crucial for the formation of a highly stable complex. To improve the nuclease resistance of the aptamer and to increase its affinity for TAR, locked nucleic acid (LNA) nucleotides were introduced in the aptamer apical loop. LNA are nucleic acids analogues that contain a 2'-O,4'-C methylene linkage and that raise the thermostablity of duplexes. We solved the NMR solution structure of the TAR-LNA-modified aptamer kissing complex. Structural analysis revealed the formation of a non-canonical G*A pair leading to increased stacking at the stem-loop junction. Our data also showed that the introduction of LNA residues provides an enhanced stability while maintaining a normal Watson-Crick base pairing with a loop-loop conformation close to an A-type.


    Organizational Affiliation

    CNRS-Université Bordeaux 1-ENITAB, UMR 5248 CBMN, Institut Européen de Chimie et Biologie, Pessac, F-33607, France. i.lebars@iecb.u-bordeaux.fr




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
RNA 16-merA16N/A
Entity ID: 2
MoleculeChainsLengthOrganism
TAR RNA element of HIV-1B16N/A
Small Molecules
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
LCA
Query on LCA
B
RNA LINKINGC11 H14 N5 O7 PA
10C
Query on 10C
B
RNA LINKINGC10 H14 N3 O8 PC
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 12 
  • Selection Criteria: The submitted structures are the 12 structures with zero violation on NOE distance, dihedral and with the lowest energy. 

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-01-29
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance