3SSF

Crystal structure of RNA:DNA dodecamer corresponding to HIV-1 polypurine tract, at 1.6 A resolution.


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.181 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

Structure of an RNA/DNA dodecamer corresponding to the HIV-1 polypurine tract at 1.6 Angstrom resolution

Drozdzal, P.Michalska, K.Kierzek, R.Lomozik, L.Jaskolski, M.

(2012) Acta Crystallogr.,Sect.D 68: 169-175

  • DOI: 10.1107/S0907444911053327

  • PubMed Abstract: 
  • The crystal structure of an RNA/DNA hybrid dodecamer, r(5'-uaaaagaaaagg):d(5'-CCTTTTCTTTTA), which contains three-quarters of the polypurine tract (PPT) sequence of the HIV RNA genome is reported. The hybrid structure was determined at 1.6 Å resoluti ...

    The crystal structure of an RNA/DNA hybrid dodecamer, r(5'-uaaaagaaaagg):d(5'-CCTTTTCTTTTA), which contains three-quarters of the polypurine tract (PPT) sequence of the HIV RNA genome is reported. The hybrid structure was determined at 1.6 Å resolution and was found to have the A-form conformation. However, the presence of alternate conformations along the RNA template strand indicated increased flexibility of the PPT sequence. Two segments (at nucleotides 1-2 and 6-8) of the RNA chain have two conformations exhibiting differences in torsion and pseudorotation angles. For conformation I((1-2), (6-8)), 25% of the RNA sugars have the C2'-exo pucker and the rest have the expected C3'-endo pucker. The II(1-2) and II(6-8) conformations of the RNA strand have one sugar with the C2'-exo pucker. None of the ribose rings exist in the C2'-endo form, in contrast to a previous report which postulated a C2'-endo ribose as a key structural element of the PPT. The widths of the minor groove for conformations I((1-2), (6-8)) and II((1-2), (6-8)) of the RNA strand are 9.2-10.5 and 9.4-10.7 Å, respectively. Both ranges are very close to the intervals accepted for A-form RNA duplexes. On the opposing DNA primer strand most of the sugars are C3'-endo, except for the 3'-terminal sugars, which are C2'-endo (T22) or O4'-endo (T23 and A24). The duplex includes a noncanonical u1(anti)·A24(syn) base interaction with only one hydrogen bond between the bases. This noncanonical base interaction at the 5'-end of the template distorts the values of the helical parameters of the adjacent base pair.


    Related Citations: 
    • An unusual sugar conformation in the structure of an RNA/DNA decamer of the polypurine tract may affect recognition by RNase H.
      Kopka, M.L.,Lavelle, L.,Han, G.W.,Ng, H.-L.,Dickerson, R.E.
      (2003) J.Mol.Biol. 334: 653
    • Crystal structure of an RNA.DNA hybrid reveals intermolecular intercalation: dimer formation by base-pair swapping.
      Han, G.W.,Kopka, M.L.,Langs, D.,Sawaya, M.R.,Dickerson, R.E.
      (2003) Proc.Natl.Acad.Sci.USA 100: 9214
    • Crystal structure of HIV-1 reverse transcriptase in complex with a polypurine tract RNA:DNA
      G Sarafianos, S.,Das, K.,Tantillo, C.,Clark Jr., A.D.,Ding, J.,Whitcomb, J.M.,Boyer, P.L.,Hughes, S.H.,Arnold, E.
      (2001) Embo J. 20: 1449


    Organizational Affiliation

    Faculty of Chemistry, A. Mickiewicz University, 60-780 Poznan, Poland.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsLengthOrganism
5'-R(*UP*AP*AP*AP*AP*GP*AP*AP*AP*AP*GP*G)-3'A12N/A
Entity ID: 2
MoleculeChainsLengthOrganism
5'-D(*CP*CP*TP*TP*TP*TP*CP*TP*TP*TP*TP*A)-3'B12N/A
Small Molecules
Ligands 1 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MG
Query on MG

Download SDF File 
Download CCD File 
A, B
MAGNESIUM ION
Mg
JLVVSXFLKOJNIY-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.6 Å
  • R-Value Free: 0.229 
  • R-Value Work: 0.181 
  • Space Group: P 32 2 1
Unit Cell:
Length (Å)Angle (°)
a = 41.904α = 90.00
b = 41.904β = 90.00
c = 57.240γ = 120.00
Software Package:
Software NamePurpose
PHASERphasing
REFMACrefinement
SCALEPACKdata scaling
DENZOdata reduction
MAR345dtbdata collection

Structure Validation

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Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2012-02-08
    Type: Initial release
  • Version 1.1: 2012-03-28
    Type: Database references