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Related Experiment Video

Updated: Jun 25, 2026

Measurement of In Vitro Integration Activity of HIV-1 Preintegration Complexes
10:34

Measurement of In Vitro Integration Activity of HIV-1 Preintegration Complexes

Published on: February 22, 2017

Quantitative analysis of HIV-1 preintegration complexes.

Alan Engelman1, Ilker Oztop, Nick Vandegraaff

  • 1Department of Cancer Immunology and AIDS, Dana-Farber Cancer Institute and Division of AIDS, Harvard Medical School, 44 Binney Street, CLSB-1010, Boston, MA 02115, USA. alan_engelman@dfci.harvard.edu

Methods (San Diego, Calif.)
|February 24, 2009
PubMed
Summary
This summary is machine-generated.

This study quantifies HIV-1 integrase activities, specifically 3' processing and DNA strand transfer, essential for provirus formation. These analyses were performed on preintegration complexes (PICs) during acute infection.

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Amplification, Next-generation Sequencing, and Genomic DNA Mapping of Retroviral Integration Sites

Published on: March 22, 2016

Area of Science:

  • Molecular Biology
  • Virology
  • Biochemistry

Background:

  • Retroviral replication requires provirus formation, where viral RNA is converted to DNA and integrated into the host genome.
  • Integrase enzyme mediates provirus formation through two key activities: 3' processing and DNA strand transfer.
  • These integrase activities occur within a large nucleoprotein complex known as the preintegration complex (PIC).

Purpose of the Study:

  • To quantitatively analyze the levels of integrase 3' processing and DNA strand transfer activities during acute HIV-1 infection.
  • To detail the methods for HIV-1 preintegration complex (PIC) extraction, partial purification, and subsequent functional assays.

Main Methods:

  • Indirect end-labeling was used to monitor denatured cDNA end regions and measure the extent of integrase 3' processing.
  • In vitro integration assays using native PICs and exogenous target DNA, quantified by Southern blotting or nested PCR, assessed DNA strand transfer activity.

Main Results:

  • The study successfully extracted and partially purified HIV-1 preintegration complexes (PICs).
  • Quantitative analyses determined the levels of both integrase 3' processing and DNA strand transfer activities occurring during acute infection.

Conclusions:

  • The methods described allow for the quantitative assessment of critical HIV-1 integrase functions within the PIC.
  • Understanding these activities is crucial for comprehending the early stages of retroviral replication and for developing antiviral strategies.