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Related Concept Videos

Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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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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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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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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Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

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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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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.
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Author Spotlight: Advancing Techniques and Discoveries in Protein Synthesis and Assembly Through Innovative Mitochondrial Research
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Synchronized mitochondrial and cytosolic translation programs.

Mary T Couvillion1, Iliana C Soto1, Gergana Shipkovenska1

  • 1Department of Genetics, Harvard Medical School, Boston, Massachusetts 02115, USA.

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|May 27, 2016
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Summary

Mitochondrial energy production requires coordinating nuclear and mitochondrial genes. This study reveals the nuclear genome directs mitochondrial and cytosolic translation for efficient oxidative phosphorylation complex synthesis.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genomics

Background:

  • Oxidative phosphorylation (OXPHOS) is crucial for cellular energy production.
  • OXPHOS complexes are encoded by both nuclear and mitochondrial genomes, posing a co-regulation challenge.
  • Previous genomic studies have largely overlooked mitochondrial gene co-regulation.

Purpose of the Study:

  • To investigate the co-regulation of nuclear and mitochondrial gene expression during mitochondrial biogenesis.
  • To explore how Saccharomyces cerevisiae coordinates the synthesis of OXPHOS complexes.
  • To establish a foundation for studying global gene regulation in mitochondria.

Main Methods:

  • Monitoring mitochondrial and nuclear gene expression in Saccharomyces cerevisiae.
  • Utilizing whole-cell genomic profiling during mitochondrial biogenesis.
  • Analyzing transcript levels of OXPHOS genes.

Main Results:

  • Nuclear and mitochondrial-encoded OXPHOS transcript levels are not concordantly regulated.
  • Mitochondrial and cytosolic translation are regulated rapidly, dynamically, and synchronously.
  • Cytosolic translation unidirectionally controls mitochondrial translation.

Conclusions:

  • The nuclear genome orchestrates mitochondrial and cytosolic translation for timely OXPHOS complex synthesis.
  • This represents an unappreciated regulatory layer in shaping the mitochondrial proteome.
  • The study provides a genomic approach for mitochondrial gene regulation studies.