Molecular Biology

, Volume 38, Issue 5, pp 718–727 | Cite as

Interactions of HIV-1 DNA Heterocyclic Bases with Viral Integrase

  • J. J. Agapkina
  • V. N. Tashlitskii
  • E. Deprez
  • J.-C. Brochon
  • A. V. Shugalii
  • J.-F. Mouscadet
  • M. B. Gottikh


Integrase (IN) is responsible for one of the key stages in the replication cycle of human immunodeficiency virus type 1, namely, integration of a DNA copy of the viral RNA into the infected cell genome. IN recognizes the nucleotide sequences located at the ends of the U3 and U5 regions of long terminal repeats (LTRs) of the viral DNA and sequentially catalyzes the 3′-end processing and strand transfer reactions. Analogs of U5 regions containing non-nucleoside insertions have been used to study the interaction between IN and viral DNA. Substrate modification has been demonstrated to have almost no effect on the rate of DNA binding by IN. However, the removal of heterocyclic bases from positions 5 and 6 of the substrate molecule and from position 3 of the processed strand almost completely inhibits IN enzymatic activity, which indicates the importance of these bases for the formation of an active enzyme–substrate complex. By contrast, modification of the third base of the nonprocessed strand stimulates 3′-processing. Since the base removal disturbs the complementary and stacking interactions in DNA, these results indicate that double-helix destabilization near the cleaved bond promotes 3′-end processing.

human immunodeficiency virus type 1 integrase DNA modification the fluorescence polarization method 3′-end processing 


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Copyright information

© MAIK “Nauka/Interperiodica” 2004

Authors and Affiliations

  • J. J. Agapkina
    • 1
  • V. N. Tashlitskii
    • 1
  • E. Deprez
    • 2
  • J.-C. Brochon
    • 2
  • A. V. Shugalii
    • 1
  • J.-F. Mouscadet
    • 2
  • M. B. Gottikh
    • 3
  1. 1.Institute of the Problems of Chemical PhysicsRussian Academy of SciencesMoscowRussia
  2. 2.LBPA, UMR 8113 CNRS, IFR121, École Normale Supérieure de CachanCachan CedexFrance
  3. 3.Faculty of Chemistry and Belozersky Institute of Physico-Chemical BiologyMoscow State UniversityMoscowRussia

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