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Subviral Agents

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Subviral agents are infectious entities that resemble viruses but lack one or more viral components, such as a capsid or essential replication machinery. These agents include viroids, prions, and satellites, each possessing distinct structural and functional characteristics that influence their mode of infection and replication.Viroids are the simplest subviral agents, consisting of circular, single-stranded RNA molecules without a protein coat. They exclusively infect plants, relying entirely...
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RNA viruses are categorized into positive-strand, negative-strand, or double-stranded groups based on their genomic structure and replication mechanisms. This classification dictates how they exploit host cellular machinery for protein synthesis and replication. Some RNA viruses also utilize reverse transcription as part of their life cycle, further diversifying their replication strategies.Positive-Strand RNA VirusesPositive-strand RNA viruses have genomes that function directly as messenger...
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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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A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...
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The term ribozyme is used for RNA that can act as an enzyme. Ribozymes are mainly found in selected viruses, bacteria, plant organelles, and lower eukaryotes. Ribozymes were first discovered in 1982 when Tom Cech’s laboratory observed Group I introns acting as enzymes. This was shortly followed by the discovery of another ribozyme, Ribonulcease P, by Sid Altman’s laboratory. Both Cech and Altman received the Nobel Prize in chemistry in 1989 for their work on ribozymes.
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Bacteriophages, or phages, are viruses that specifically infect bacteria. Among them, T-even bacteriophages, such as T4, exhibit a well-characterized lytic replication cycle in Escherichia coli (E. coli). This process ensures the rapid proliferation of the virus while ultimately leading to the destruction of the bacterial host.Attachment and DNA InjectionThe infection process begins with the recognition and binding of the T4 phage to the E. coli cell surface. Tail fibers of the phage...
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Viral Nucleases.

Zhengqiang Wang1, Robert J Geraghty1

  • 1Center for Drug Design, College of Pharmacy, University of Minnesota, Minneapolis, MN 55455, USA.

Viruses
|March 30, 2023
PubMed
Summary
This summary is machine-generated.

Nucleases are enzymes that break down DNA and RNA. These essential biomolecules play critical roles in cellular processes and biotechnology applications.

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Area of Science:

  • Biochemistry and Molecular Biology
  • Enzymology

Background:

  • Nucleases are vital hydrolytic enzymes involved in nucleic acid metabolism.
  • They function by cleaving phosphodiester bonds in DNA and RNA.
  • Classified as DNases, RNases, or phosphodiesterases, and by cleavage site as endonucleases or exonucleases.

Discussion:

  • The diverse mechanisms of nucleases are central to genetic research and therapeutic development.
  • Understanding nuclease activity is crucial for manipulating genetic material.
  • Their roles extend from DNA repair to RNA degradation pathways.

Key Insights:

  • Nucleases catalyze the hydrolysis of phosphodiester bonds in nucleic acids.
  • Enzymatic specificity determines whether DNA, RNA, or both are targeted.
  • Substrate specificity and cleavage patterns define nuclease function.

Outlook:

  • Exploring novel nuclease applications in gene editing technologies.
  • Investigating nuclease roles in disease pathogenesis and therapeutic interventions.
  • Developing engineered nucleases with tailored specificities for biotechnological advancements.