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Related Concept Videos

Inhibitors of Virion Maturation and Assembly01:19

Inhibitors of Virion Maturation and Assembly

As part of their replication cycle, certain viruses synthesize long precursor proteins called polyproteins within infected host cells. In human immunodeficiency virus (HIV), two major polyproteins are produced: Gag and Gag-Pol. The Gag polyprotein supplies the structural components of the virus, while Gag-Pol includes essential viral enzymes such as reverse transcriptase, integrase, and protease. After synthesis, these polyproteins move to the host cell membrane, where they assemble into an...
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Certain biochemical processes, such as embryonic development and cell growth regulation, depend on the repression of specific genes. DNA binding proteins known as eukaryotic transcription inhibitors regulate the repression of gene expression in eukaryotes. The presence of these inhibitors at the required location and time in the cell is triggered by the presence of hormones and additional signals from other cells.
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Heterochromatin02:38

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The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
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Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Spreading of Chromatin Modifications02:25

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The histone proteins in the nucleosomes are post-translationally modified (PTM) to increase or decrease access to DNA. The commonly observed PTMs are methylation, acetylation, phosphorylation, and ubiquitination of lysine amino acids in the histone H3 tail region. These histone modifications have specific meaning for the cell. Hence, they are called "histone code". The protein complex involved in histone modification is termed as "reader-writer" complex.
Writers
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Human Polycomb group EED protein negatively affects HIV-1 assembly and release.

Dina Rakotobe1, Jean-Claude Tardy, Patrice André

  • 1Laboratoire de Virologie & Pathologie Humaine, Université Lyon I & CNRS FRE-3011, Faculté de Médecine Laennec, Lyon Cedex 08, France. dinaraktb@yahoo.fr

Retrovirology
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PubMed
Summary

The EED protein inhibits HIV-1 replication by affecting viral assembly and RNA packaging. Nef protein counteracts this effect by altering the cellular localization of both EED and Nef.

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Area of Science:

  • Virology
  • Molecular Biology
  • Cell Biology

Background:

  • The human EED protein, a Polycomb group (PcG) protein, interacts with HIV-1 Gag, Integrase, and Nef.
  • Understanding EED's role in HIV-1 replication is crucial for developing antiviral strategies.

Purpose of the Study:

  • To investigate the biological role of the EED protein in HIV-1 replication.
  • To analyze the interaction between EED and HIV-1 components, particularly Nef.

Main Methods:

  • HIV-1-based vector (HIV-Luc) and EED expression in 293T cells.
  • Virus infectivity, production assays (CAp24, genomic RNA), and protein synthesis analysis.
  • Cell fractionation, confocal imaging, and electron microscopy.

Main Results:

  • EED expression reduced HIV-1 production at late stages (20-80 fold decrease), impacting RNA packaging and virus assembly.
  • Nef (WT and NefG2A) restored virus yields by promoting EED relocalization into an insoluble fraction with Nef.
  • EED mislocalized from lipid rafts in the absence of Nef; Nef co-expression induced EED redistribution.

Conclusions:

  • EED exhibits antiviral activity against HIV-1 late-stage replication, potentially by disrupting gRNA or gRNA/Gag complex trafficking.
  • Nef antagonizes EED's antiviral effect, requiring an intact N-terminal domain but not N-myristoylation.
  • Nef-mediated reversal of EED's effect involves coordinated cellular redistribution of both proteins.