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Related Experiment Video

Updated: Jun 4, 2026

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers

Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers

Published on: March 8, 2012

Interplay between HIV entry and transportin-SR2 dependency.

Wannes Thys¹, Stéphanie De Houwer, Jonas Demeulemeester

¹Laboratory of Molecular Virology and Gene Therapy, Katholieke Universiteit Leuven, Kapucijnenvoer 33, VCTB+5, B-3000 Leuven, Flanders, Belgium.

|February 1, 2011

Summary

This summary is machine-generated.

Transportin-SR2 (TRN-SR2) is crucial for HIV-1 replication, with its requirement influenced by viral entry mechanisms. Capsid mutations affect TRN-SR2 dependency, especially with specific viral envelopes, impacting HIV nuclear import.

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Area of Science:

Virology
Molecular Biology
Cell Biology

Background:

Transportin-SR2 (TRN-SR2) is a nuclear import factor identified as an interaction partner of HIV-1 integrase.
Previous studies suggested a role for the HIV-1 capsid in TRN-SR2-mediated nuclear import, based on chimeric viruses and capsid mutants.

Purpose of the Study:

To investigate the specificity of TRN-SR2 usage by lentiviruses.
To determine the role of the HIV-1 capsid and viral entry pathways in TRN-SR2 dependency.

Main Methods:

Analysis of viral specificity for TRN-SR2.
Re-analysis of HIV-1 N74D capsid mutant in TRN-SR2-depleted cells.
Pseudotyping viruses with various envelopes mediating pH-dependent or independent uptake.

Main Results:

TRN-SR2 dependency varies among lentiviruses and is not determined by the DNA flap.
The HIV-1 N74D capsid mutant shows reduced TRN-SR2 dependency, particularly when pseudotyped with VSV-G.
Dependency on TRN-SR2 for the N74D mutant is retained with HIV-1, measles, and amphotropic MLV envelopes but lost with VSV-G and Ebola virus envelopes.

Conclusions:

A link exists between HIV viral entry and TRN-SR2 interaction.
TRN-SR2 is important for HIV-1 replication.
Results highlight the need for careful interpretation of studies using VSV-G pseudotyped viruses in early HIV replication research.