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Related Concept Videos

Viral Structure00:56

Viral Structure

Viruses are extraordinarily diverse in shape and size, but they all have several structural features in common. All viruses have a core that contains a DNA- or RNA-based genome. The core is surrounded by a protective coat of proteins called the capsid. The capsid is composed of subunits called capsomeres. The capsid and genome-containing core are together known as the nucleocapsid.
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...
Introduction to Virus01:28

Introduction to Virus

Viruses are unique biological entities that blur the boundary between living and non-living systems. Although they lack cellular structure and metabolic processes, they can exhibit characteristics of life when infecting a host. Their defining feature is a nucleic acid core, composed of either DNA or RNA, encapsulated within a protein coat called a capsid. This simple structure allows them to invade host cells and use their machinery for replication efficiently.Viral Structure and...
Inhibitors Of Virion Release01:25

Inhibitors Of Virion Release

Viral replication and dissemination rely on efficient mechanisms for host cell entry, genome replication, assembly, and release. Influenza viruses, such as types A and B, are negative-sense single-stranded RNA viruses with a segmented genome, that depend on two critical surface glycoproteins to carry out these processes: hemagglutinin (HA) and neuraminidase (NA). HA initiates infection by binding to sialic acid residues on the surface of host epithelial cells, facilitating receptor-mediated...
Leaky Scanning02:28

Leaky Scanning

During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA.  Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
Immune Response Against Viral Pathogens01:29

Immune Response Against Viral Pathogens

The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...

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Related Experiment Video

Updated: Jul 7, 2026

Nucleocapsid Annealing-Mediated Electrophoresis (NAME) Assay Allows the Rapid Identification of HIV-1 Nucleocapsid Inhibitors
08:33

Nucleocapsid Annealing-Mediated Electrophoresis (NAME) Assay Allows the Rapid Identification of HIV-1 Nucleocapsid Inhibitors

Published on: January 19, 2015

Nucleocapsid protein function in early infection processes.

James A Thomas1, Robert J Gorelick

  • 1AIDS Vaccine Program, Basic Sciences Program, SAIC-Frederick, Inc., NCI-Frederick, P.O. Box B, Building 535, Room 410, Frederick, MD 21702-1201, USA.

Virus Research
|February 19, 2008
PubMed
Summary
This summary is machine-generated.

Nucleocapsid protein (NC) acts as a nucleic acid chaperone, enhancing essential steps in retroviral replication like reverse transcription and integration. While not strictly required, NC significantly boosts infection efficiency, improving retroviral survival.

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Temporal Analysis of the Nuclear-to-cytoplasmic Translocation of a Herpes Simplex Virus 1 Protein by Immunofluorescent Confocal Microscopy

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

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Last Updated: Jul 7, 2026

Nucleocapsid Annealing-Mediated Electrophoresis (NAME) Assay Allows the Rapid Identification of HIV-1 Nucleocapsid Inhibitors
08:33

Nucleocapsid Annealing-Mediated Electrophoresis (NAME) Assay Allows the Rapid Identification of HIV-1 Nucleocapsid Inhibitors

Published on: January 19, 2015

Temporal Analysis of the Nuclear-to-cytoplasmic Translocation of a Herpes Simplex Virus 1 Protein by Immunofluorescent Confocal Microscopy
06:40

Temporal Analysis of the Nuclear-to-cytoplasmic Translocation of a Herpes Simplex Virus 1 Protein by Immunofluorescent Confocal Microscopy

Published on: November 4, 2018

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

Area of Science:

  • Virology
  • Molecular Biology
  • Biochemistry

Background:

  • Retroviral replication involves complex steps including reverse transcription and integration.
  • Nucleocapsid protein (NC) is a key component of retroviral cores, known to interact with nucleic acids.

Purpose of the Study:

  • To investigate the role and necessity of nucleocapsid protein (NC) in facilitating early retroviral replication steps.
  • To determine if NC is essential or merely enhancing for processes like reverse transcription and integration.

Main Methods:

  • Utilized various cell-free assay systems to study mature NC proteins (e.g., HIV-1 p7(NC), MLV p10(NC)).
  • Assessed the effect of NC on multiple nucleic acid-related reactions including tRNA annealing, reverse transcription initiation and processivity, strand transfers, and integrase-mediated DNA processing.

Main Results:

  • Key replication steps such as reverse transcription initiation, strand transfers, and integration can occur to varying degrees without NC.
  • Some of these reactions are facilitated by other viral or non-viral proteins and peptides.
  • NC was observed to enhance the efficiency of these individual steps.

Conclusions:

  • Nucleocapsid protein (NC) is not strictly required for early retroviral replication but acts as a crucial facilitator.
  • NC significantly enhances the efficiency of reverse transcription and integration, thereby increasing the overall productivity of retroviral infection.
  • The enhancing role of NC ultimately increases the probability of productive replication and contributes to retroviral survival.