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Related Experiment Videos

Target DNA capture by HIV-1 integration complexes

M D Miller1, Y C Bor, F Bushman

  • 1Infectious Disease Laboratory, Salk Institute for Biological Studies, La Jolla, California 92024, USA.

Current Biology : CB
|September 1, 1995
PubMed
Summary
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Human immunodeficiency virus 1 (HIV-1) integrase complexes bind target DNA without sliding. Cellular factors in vivo may reverse target-site capture by HIV-1 preintegration complexes.

Area of Science:

  • Molecular Biology
  • Virology

Background:

  • Human immunodeficiency virus 1 (HIV-1) replication involves reverse transcription and cDNA integration into host DNA.
  • The preintegration complex binds target DNA before strand transfer, with capture mechanisms including binding/release, sliding, or initial site integration.
  • Understanding target-DNA capture is crucial for gene therapy design and interpreting in vivo integration site selection.

Purpose of the Study:

  • To investigate the mechanism of target-DNA capture by HIV-1 integrase complexes.
  • To differentiate between possible pathways of target-DNA capture: binding/release, facilitated diffusion (sliding), or integration at the initial capture site.

Main Methods:

  • Developed new in vitro conditions to assemble HIV-1 integrase with viral DNA and trap complexes bound to target DNA.

Related Experiment Videos

  • Utilized a hybrid protein of HIV-1 integrase and a sequence-specific DNA-binding domain to analyze target capture.
  • Monitored target-DNA capture by HIV-1 preintegration complexes purified from infected cells and in crude cytoplasmic extracts.

    • Main Results:

    • HIV-1 integrase-viral DNA complexes do not exhibit significant sliding along target DNA after binding under the new in vitro conditions.
    • The integrase domain in a hybrid protein binds rapidly and tightly, hindering the DNA-binding domain.
    • Partially purified preintegration complexes commit quickly and stably to target DNA, while those in crude extracts do not, and cellular extracts inhibit this commitment.

    Conclusions:

    • HIV-1 integrase complexes bind target DNA quickly and stably without subsequent sliding in vitro.
    • In vivo target-site capture by HIV-1 preintegration complexes appears reversible, influenced by cellular factors.