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Related Concept Videos

Retroviruses02:33

Retroviruses

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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’...
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Retroviruses are RNA viruses that have been shown to cause cancers in diverse species, including chickens, mice, cats, and monkeys. The RNA genomes of these viruses are first reverse-transcribed into single and then double-stranded DNA (dsDNA) copies. This dsDNA called proviral DNA then integrates into the host genome. Subsequently, the host cell transcribes the proviral DNA in concert with the chromosomal DNA. This leads to the production of viral RNA and proteins that assemble at the host...
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Several cytokine receptors have tightly bound Janus kinase or JAK proteins attached at their cytosolic tail. Small signaling molecules such as cytokines, growth hormones, or prolactins bind to the cytokine receptors and initiate their dimerization. The dimerization brings the cytosolic JAKs together that trans-phosphorylate and activates each other. The activated JAKs now phosphorylate cytosolic tails of the cytokine receptors, which serve as binding sites for adaptor proteins such as  SH2...
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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.
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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...
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Viral Structure00:56

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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.
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Chemokine-binding proteins encoded by herpesviruses.

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    Viruses use viral chemokine-binding proteins (vCKBPs) to evade immune responses. Understanding herpesvirus vCKBPs offers potential for treating inflammatory diseases by modulating chemokine activity.

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    Area of Science:

    • Immunology
    • Virology
    • Molecular Biology

    Background:

    • Pathogens, including viruses, employ strategies to evade host immune systems.
    • Viruses interact with the host chemokine network to disrupt immune surveillance and promote infection.
    • Viral immunomodulators, such as viral chemokine-binding proteins (vCKBPs), mimic or bind host chemokines.

    Purpose of the Study:

    • To investigate viral chemokine-binding proteins (vCKBPs) encoded by herpesviruses.
    • To explore the potential of vCKBPs in modulating chemokine-mediated immune responses.
    • To identify therapeutic applications of vCKBPs in treating viral infections and inflammatory diseases.

    Main Methods:

    • Focus on vCKBPs encoded by alpha-, beta-, and gamma-herpesviruses.
    • Review of experimental data on vCKBP function and application in animal models.
    • Analysis of vCKBP mechanisms in sequestering host chemokines and inhibiting chemotaxis.

    Main Results:

    • Herpesviruses and Poxviruses encode vCKBPs that can sequester host chemokines.
    • vCKBPs interfere with chemokine gradient formation and ligand-receptor interactions.
    • Several herpesvirus vCKBPs have demonstrated anti-inflammatory and anti-immune properties in vivo.

    Conclusions:

    • vCKBPs offer a mechanism for viruses to evade immune detection and control.
    • Herpesvirus vCKBPs can be leveraged to regulate chemokine and chemokine receptor activity.
    • Targeting vCKBPs presents a promising therapeutic strategy for inflammatory diseases and infections.