Related Experiment Video

Updated: Mar 29, 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

8.1K

Mechanisms of APOBEC3 Packaging into HIV-1

Mirriam Nzivo1,2, Christoph G W Gertzen3,4, Tom Luedde1

  • 1Clinic of Gastroenterology, Hepatology and Infectious Diseases, Medical Faculty, Heinrich Heine University Düsseldorf, 40225 Duesseldorf, Germany.

Viruses
|March 28, 2026
PubMed

Insights

Apolipoprotein B mRNA editing enzyme catalytic polypeptides 3s (APOBEC3s) are antiviral proteins crucial for restricting viruses like HIV-1. This review details how APOBEC3s are packaged into viral particles, a key step in their antiviral function.

Area of Science:

  • Virology
  • Molecular Biology
  • Immunology

Background:

  • APOBEC3s are DNA cytidine deaminases with broad antiviral activity.
  • Seven APOBEC3 members exist, with specific members packaged into HIV-1 virions.
  • Efficient packaging of APOBEC3s into virions is essential for viral restriction but mechanisms are not fully understood.

Purpose of the Study:

  • To synthesize current knowledge on APOBEC3 packaging into viral particles.
  • To highlight the factors influencing APOBEC3 virion incorporation.
  • To emphasize the interplay of protein, RNA, and membrane determinants in APOBEC3 packaging.

Main Methods:

  • Literature review and synthesis of existing research on APOBEC3 packaging.
  • Analysis of protein-RNA interactions and cellular localization in virion incorporation.
  • Focus on HIV-1 as a model system for APOBEC3 packaging.

Main Results:

  • APOBEC3 packaging requires interaction with HIV-1 GAG polyprotein domains (MA, NC) and RNA binding.
  • Specific amino acid residues in APOBEC3s mediate interactions for packaging.
  • Cellular localization, such as lipid raft association for A3G, influences packaging efficiency.
  • Mechanisms for A3F and A3G packaging are well-studied, but less is known for other APOBEC3s.

Conclusions:

  • APOBEC3 packaging is a complex process involving viral proteins, nucleic acids, and host cell factors.
  • Understanding these mechanisms is critical for developing antiviral strategies targeting viral replication.
  • Further research is needed to fully elucidate the packaging mechanisms of all APOBEC3 family members.
Keywords:
APOBEC3sGAGHIV-1RNAspackaging

More Related Videos

Nucleocapsid Annealing-Mediated Electrophoresis NAME Assay Allows the Rapid Identification of HIV-1 Nucleocapsid Inhibitors08:33

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

Published on: January 19, 2015

9.4K
Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells13:07

Determining 3'-Termini and Sequences of Nascent Single-Stranded Viral DNA Molecules during HIV-1 Reverse Transcription in Infected Cells

Published on: January 30, 2019

10.0K

Related Concept Videos

Intralumenal Vesicles and Multivesicular Bodies01:38

Intralumenal Vesicles and Multivesicular Bodies

Intraluminal vesicles (ILVs) are small vesicles 50-80 nm in diameter formed during the maturation of early endosomes. A specialized endosome containing numerous ILVs is called a multivesicular body (MVB). ILVs contain internalized molecules such as antigens, nucleic acids, proteins, and metabolites. Some of these molecules are released from the MVBs inside exosomes and are transported to other cells. Other MVBs contain molecules that are retained in the ILVs and are later degraded within the...
5.2K
Retrovirus Life Cycles01:10

Retrovirus Life Cycles

Retroviruses have a single-stranded RNA genome that undergoes a special form of replication. Once the retrovirus has entered the host cell, an enzyme called reverse transcriptase synthesizes double-stranded DNA from the retroviral RNA genome. This DNA copy of the genome is then integrated into the host’s genome inside the nucleus via an enzyme called integrase. Consequently, the retroviral genome is transcribed into RNA whenever the host’s genome is transcribed, allowing the...
50.6K
Protein Complex Assembly02:41

Protein Complex Assembly

Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types.  Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
17.1K
Size and Structure of Viral Genomes01:26

Size and Structure of Viral Genomes

Viral genomes exhibit remarkable diversity in size, structure, and composition, influencing their replication strategies and interactions with host cells. These genomes consist of either DNA or RNA and may be linear or circular. Additionally, they can be single-stranded or double-stranded, with each configuration affecting how the virus propagates within a host. RNA viruses, for instance, generally have smaller genomes than DNA viruses, a factor that contributes to their high mutation rates and...
1.1K
Coat Assembly and GTPases01:33

Coat Assembly and GTPases

Vesicles incorporate different coat protein subunits in different cell locations, which changes the properties of the coat, such as the shape and geometry of the transport vesicles. Thus, vesicle coat proteins also play a significant role in cargo selection.
Coat assembly depends on the local availability of phosphatidylinositol phosphates or PIPs and GTP-binding proteins. Adaptor proteins, which link the coat proteins to the membrane, bind to these PIPs and play a crucial role in controlling...
4.7K
Receptor-mediated Endocytosis01:38

Receptor-mediated Endocytosis

Overview
113.4K