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Related Experiment Video

Updated: Mar 28, 2026

Alternative In Vitro Methods for the Determination of Viral Capsid Structural Integrity
12:57

Alternative In Vitro Methods for the Determination of Viral Capsid Structural Integrity

Published on: November 16, 2017

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HIV-1 Capsid Stabilization Assay.

Thomas Fricke1, Felipe Diaz-Griffero2

  • 1Department of Microbiology and Immunology, Albert Einstein College of Medicine, 1301 Morris Park-Price Center 501, Bronx, NY, 10461, USA.

Methods in Molecular Biology (Clifton, N.J.)
|December 31, 2015
PubMed
Summary

The HIV-1 core

Keywords:
CapsidCoreHIV-1StabilityUncoating

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Area of Science:

  • Virology
  • Molecular Biology
  • Drug Discovery

Background:

  • HIV-1 core stability is essential for viral replication.
  • Cytosolic factors influence HIV-1 capsid integrity.
  • Previous studies linked core stability to reverse transcription and infection defects.

Purpose of the Study:

  • To detail a novel assay for measuring HIV-1 capsid stability in vitro.
  • To demonstrate the assay's utility in assessing drug effects on capsid stability.
  • To validate the role of CPSF6 protein in stabilizing HIV-1 cores.

Main Methods:

  • Development of a simple in vitro assay for HIV-1 CA-NC complex stability.
  • Testing the assay with various small molecules (PF74, CAP-1, IXN-053, cyclosporine A, Bi2, CAI).
  • Assessment of purified CPSF6 (1-321) protein's effect on capsid stability.

Main Results:

  • Cytosolic extracts were shown to significantly stabilize HIV-1 cores.
  • The assay successfully measured the impact of tested drugs on capsid stability.
  • Purified CPSF6 (1-321) protein demonstrated a stabilizing effect on HIV-1 CA-NC complexes.

Conclusions:

  • The developed assay is a powerful tool for assessing HIV-1 capsid stability in vitro.
  • This assay can be used to screen for drugs that modulate HIV-1 core stability.
  • CPSF6 is identified as a host factor that stabilizes the HIV-1 core.