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Related Concept Videos

Improving Translational Accuracy02:07

Improving Translational Accuracy

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...
Mitochondrial Protein Sorting01:39

Mitochondrial Protein Sorting

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.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...
Translocation of Proteins into the Mitochondria01:19

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...
Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

Porins are beta-barrel proteins translocated to the mitochondrial outer membrane through the TOM complex into the intermembrane space. Porin precursors bind TIM chaperones within the intermembrane space and are guided to the Sorting and Assembly Machinery complex or SAM complex on the outer mitochondrial membrane.
Three models describe the assembly of porins by the SAM complex and their insertion into the outer membrane. Model 1 suggests that porins are assembled outside the SAM channel as the...
Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70  chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial precursors...
ATP Synthase: Mechanism01:48

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased ATP...

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Related Experiment Video

Updated: May 17, 2026

Rapid Isolation of the Mitoribosome from HEK Cells
09:33

Rapid Isolation of the Mitoribosome from HEK Cells

Published on: October 4, 2018

Mitochondrial protein synthesis: efficiency and accuracy.

Kirsten Kehrein1, Nathalie Bonnefoy, Martin Ott

  • 11 Center for Biomembrane Research, Department of Biochemistry and Biophysics, Stockholm University , Stockholm, Sweden .

Antioxidants & Redox Signaling
|October 24, 2012
PubMed
Summary
This summary is machine-generated.

Mitochondrial protein synthesis is crucial for cellular energy production and aging. Enhancing the efficiency and accuracy of this process is key to understanding mitochondrial function and developing new therapeutic strategies.

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Last Updated: May 17, 2026

Rapid Isolation of the Mitoribosome from HEK Cells
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Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae
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Labelling and Visualization of Mitochondrial Genome Expression Products in Baker's Yeast Saccharomyces cerevisiae

Published on: April 11, 2021

Area of Science:

  • Cellular Biology
  • Molecular Genetics
  • Biochemistry

Background:

  • Mitochondrial gene expression evolved from bacterial ancestors, with unique features in genome organization, transcription, and translation.
  • Mitochondrial ribosomes possess unique proteins, suggesting adaptation to organelle-specific needs.
  • Post-transcriptional regulation by mRNA-specific activators fine-tunes protein synthesis for oxidative phosphorylation (OXPHOS) complex assembly.

Purpose of the Study:

  • To summarize recent advances in understanding mitochondrial protein synthesis.
  • To compare knowledge from various model systems used in mitochondrial biogenesis research.
  • To highlight areas requiring further mechanistic understanding and innovative research approaches.

Main Methods:

  • Comparative analysis of mitochondrial biogenesis research across different model systems.
  • Review of recent findings on mitochondrial gene expression, regulation, and ribosome architecture.
  • Integration of knowledge on translational control and its impact on OXPHOS complex assembly.

Main Results:

  • Mitochondrial protein synthesis is essential for producing core subunits of OXPHOS complexes like the respiratory chain and ATP synthase.
  • The efficiency and accuracy of mitochondrial translation directly impact the assembly of functional OXPHOS complexes.
  • Emerging evidence links mitochondrial gene expression efficiency to the aging process in eukaryotes.

Conclusions:

  • Mitochondrial protein synthesis is a critical determinant of cellular energy production and aging.
  • While significant progress has been made, many mechanistic details of mitochondrial gene expression remain elusive.
  • Further innovative biochemical and genetic studies are necessary to fully elucidate these vital processes.