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Related Concept Videos

What are Viruses?00:50

What are Viruses?

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Overview
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Translation01:31

Translation

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Lesson: Translation
Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
Translation Produces the Building Blocks of...
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Translation01:31

Translation

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Translation is the process of synthesizing proteins from the genetic information carried by messenger RNA (mRNA). Following transcription, it constitutes the final step in the expression of genes. This process is carried out by ribosomes, complexes of protein and specialized RNA molecules. Ribosomes, transfer RNA (tRNA), and other proteins produce a chain of amino acids—the polypeptide—as the end product of translation.
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Proteins are...
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Initiation of Translation02:33

Initiation of Translation

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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Termination of Translation01:44

Termination of Translation

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The large ribosomal subunit has several important structures essential to translation. These include the peptidyl transferase center (PTC) - which is the site where the peptide bond is formed - and a large, internal, water-filled tube through which the nascent polypeptide moves. This latter structure is called the Peptide Exit Tunnel, and it begins at the PTC and spans the body of the large ribosomal subunit. During translation, as the nascent polypeptide chain is synthesized, it passes through...
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Improving Translational Accuracy02:07

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Base complementarity between the three base pairs of mRNA codon and the tRNA anticodon is not a failsafe mechanism. Inaccuracies can range from a single mismatch to no correct base pairing at all. The free energy difference between the correct and nearly correct base pairs can be as small as 3 kcal/ mol. With complementarity being the only proofreading step, the estimated error frequency would be one wrong amino acid in every 100 amino acids incorporated. However, error frequencies observed in...
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Translational Control in Virus-Infected Cells.

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Viruses hijack host cell machinery for replication by controlling protein synthesis and evading immune responses. Understanding these viral tactics reveals fundamental insights into cellular control of protein production in health and disease.

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Area of Science:

  • Virology
  • Molecular Biology
  • Cellular Biology

Background:

  • Viruses are obligate intracellular parasites reliant on host cell machinery for replication.
  • Host cells possess complex signaling networks and immune defenses to regulate protein synthesis and restrict viral infections.

Purpose of the Study:

  • To review viral strategies for commandeering host ribosomes and subverting cellular defenses.
  • To explore how viruses dominate the infected cell's translational landscape.
  • To highlight the implications for understanding virus reproduction and cellular protein synthesis.

Main Methods:

  • Literature review of viral tactics and mechanisms.
  • Analysis of host-virus interactions at the translational level.
  • Synthesis of current knowledge on ribosome control and immune evasion.

Main Results:

  • Viruses employ diverse strategies to control host ribosomes and protein synthesis.
  • Effective subversion of host defenses is critical for viral replication.
  • Viral manipulation of translation impacts fundamental cellular processes.

Conclusions:

  • Viral appropriation of host translation machinery is essential for reproduction.
  • Studying viral strategies advances our understanding of cellular protein synthesis regulation.
  • These mechanisms are crucial in both viral infections and cellular health/disease contexts.