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Retrovirus Life Cycles01:10

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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 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...
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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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LTR retrotransposons are class I transposable elements with long terminal repeats flanking an internal coding region. These elements are less abundant in mammals compared to other class I transposable elements. About 8 percent of human genomic DNA comprises LTR retrotransposons. Some of the common examples of LTR retrotransposons are Ty elements in yeast and Copia elements in Drosophila.
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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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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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Retrovirus maturation-an extraordinary structural transformation.

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Area of Science:

  • Virology
  • Structural Biology
  • Molecular Biology

Background:

  • Retroviruses, including Human Immunodeficiency Virus type 1 (HIV-1), are initially released from host cells in an immature, non-infectious state.
  • Viral maturation is a critical post-assembly process essential for infectivity, involving significant structural and architectural transformations of the viral particle.

Purpose of the Study:

  • To elucidate the structural differences between immature and mature retroviral particles.
  • To describe the molecular mechanisms underlying the retroviral maturation process.
  • To highlight the role of viral protease in mediating these structural changes.

Main Methods:

  • Analysis of structural data from immature and mature retroviral particles.
  • Review of existing literature on retroviral assembly, budding, and maturation pathways.
  • Examination of the function and regulation of viral protease activity in maturation.

Main Results:

  • Maturation involves extensive proteolytic cleavages by the viral protease, restructuring protein domains and their interactions.
  • The viral particle undergoes a dramatic architectural rearrangement, transitioning from an immature to a mature, infectious form.
  • Specific cleavage events are precisely controlled, dictating the timing and extent of maturation.

Conclusions:

  • Retroviral maturation is a complex, protease-dependent process vital for viral infectivity.
  • Despite significant progress, fundamental questions regarding the precise molecular events and regulation of maturation persist.
  • Targeting the viral protease and maturation pathway remains a crucial strategy for antiretroviral drug development.