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Related Concept Videos

Initiation of Translation02:33

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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.
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Translocation of Proteins into the Mitochondria01:19

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Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
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Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death.  Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
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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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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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Author Spotlight: Advancing Techniques and Discoveries in Protein Synthesis and Assembly Through Innovative Mitochondrial Research
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Structural Basis of TACO1-Mediated Efficient Mitochondrial Translation.

Shuhui Wang1, Michele Brischigliaro2, Yuekang Zhang1

  • 1Department of Molecular Biophysics and Biochemistry, Yale University, New Haven, CT 06511, USA.

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Summary

The mitochondrial translation accelerator TACO1 enhances protein synthesis on human mitoribosomes, especially during difficult polyproline sequences. TACO1 prevents ribosome stalling by stabilizing tRNA and promoting efficient elongation.

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Genetics

Background:

  • Protein synthesis elongation is crucial and conserved across species.
  • Elongation factors interact with the ribosomal L7/L12 stalk.
  • Mitochondrial translation requires specific factors and mechanisms.

Purpose of the Study:

  • To elucidate the role and mechanism of TACO1 in human mitochondrial translation.
  • To understand how TACO1 promotes efficient elongation on mitoribosomes.

Main Methods:

  • *In organello* cryo-electron microscopy.
  • Structural analysis of TACO1-mitoribosome complex.
  • Biochemical assays to assess elongation factor function.

Main Results:

  • TACO1 binds to a unique mitoribosomal site, bridging subunits and interacting with rRNA and proteins.
  • TACO1 is essential for efficient translation of polyproline motifs, preventing ribosome stalling.
  • TACO1 stabilizes A-site tRNA and enhances peptidyl transfer, distinct from other known factors.

Conclusions:

  • TACO1 acts as a mitochondrial translation accelerator, crucial for overcoming challenging sequences.
  • TACO1's mechanism involves stabilizing key translation intermediates and promoting efficient factor turnover.
  • Bacterial TACO1 orthologs may perform similar conserved functions in maintaining translation efficiency.