Related Experiment Video
Updated: May 6, 2026
10:20
Assembly and Purification of Prototype Foamy Virus Intasomes
Published on: March 19, 2018
5.2K
HIV-1 accessory proteins: Vpu and Vif
1Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, USA.
Methods in Molecular Biology (Clifton, N.J.)
|October 26, 2013
Summary
Human immunodeficiency virus type 1 (HIV-1) Vif and Vpu proteins are key factors in viral replication. Techniques are described to study these viral proteins and their interactions with host factors, aiding in understanding HIV-1 infection.
Area of Science:
- Virology
- Molecular Biology
- Immunology
Background:
- HIV-1 Vif and Vpu are accessory viral proteins crucial for late-stage replication.
- Vif inhibits APOBEC3G incorporation, impacting viral infectivity.
- Vpu degrades CD4 and antagonizes BST-2, aiding virus release.
Purpose of the Study:
- To describe methods for characterizing HIV-1 Vif and Vpu.
- To detail techniques for analyzing their functional interactions with host factors.
- To highlight the broader applicability of these methods for other viral proteins.
Main Methods:
- Biochemical assays for protein characterization.
- Functional assays to study protein-host factor interactions.
- Techniques applicable to diverse viral protein analyses.
Main Results:
- Established methods for Vif and Vpu characterization.
- Demonstrated techniques for analyzing Vif-APOBEC3G and Vpu-BST-2 interactions.
- Validated the utility of these methods for broader viral protein research.
Conclusions:
- The described techniques provide a framework for studying HIV-1 Vif and Vpu.
- These methods facilitate understanding of viral replication mechanisms.
- The techniques are adaptable for analyzing other viral proteins and host interactions.
Related Concept Videos
01:26Size and Structure of Viral Genomes
1.2K
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...
1.2K
02:33Retroviruses
12.3K
Retroviruses and retrotransposons both insert copies of their genetic elements into the genome of the host cell. Thus, the viral genes are passed on when the host genome is replicated or translated. A typical retroviral DNA sequence contains 3-4 genes that encode the different proteins required for its structural assembly and function as a molecular parasite. This DNA is transcribed into a single mRNA, which is very similar in structure to conventional mRNAs, i.e., it is capped at the 5’...
12.3K
02:28Leaky Scanning
4.5K
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...
4.5K
02:36RNA Polymerase II Accessory Proteins
3.0K
3.0K
02:36RNA Polymerase II Accessory Proteins
8.9K
Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...
8.9K
01:38Intralumenal Vesicles and Multivesicular Bodies
4.0K
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...
4.0K