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Related Concept Videos

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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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,...
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Mitochondrial Protein Sorting01:39

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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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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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Protein Transport into the Inner Mitochondrial Membrane01:34

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Nuclear encoded mitochondrial precursors are imported to the inner membrane in a multistep process involving two separate translocons, TIM22 and TIM23. TIM23 is a cation-selective pore that remains closed by the N terminal segment of the protein. Negative charges on the TIM23 act as a receptor for the incoming precursor, pulling the positively charged matrix-targeting sequence for peptide insertion and translocation.
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Energy to Drive Translocation01:37

Energy to Drive Translocation

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Mitochondrial protein import is powered by two distinct energy sources: ATP hydrolysis and electrochemical potential across the inner membrane. Newly synthesized precursors are bound by cytosolic chaperones of the Hsp70 family, which guide them to the import receptors on the mitochondrial surface. Utilizing the energy of ATP hydrolysis, Hsp70 chaperones transfer these precursors to the TOM receptors on the mitochondrial outer membrane.
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Mitochondrial Precursor Proteins01:39

Mitochondrial Precursor Proteins

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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.
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Related Experiment Video

Updated: Jun 25, 2025

Author Spotlight: Advancing Techniques and Discoveries in Protein Synthesis and Assembly Through Innovative Mitochondrial Research
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Author Spotlight: Advancing Techniques and Discoveries in Protein Synthesis and Assembly Through Innovative Mitochondrial Research

Published on: June 7, 2024

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Decoding the Enigma: Translation Termination in Human Mitochondria.

Annika Krüger1, Daria Kovalchuk1, Dmitrii Shiriaev1

  • 1Department of Medical Biochemistry and Biophysics, Division of Molecular Metabolism, Karolinska Institutet, Solnavägen 9, Solna 171 65, Sweden.

Human Molecular Genetics
|May 23, 2024
PubMed
Summary
This summary is machine-generated.

Mitochondrial translation termination relies on factors like mtRF1 and mtRF1a for accurate protein synthesis. This review details their structures and functions in human mitochondria.

Keywords:
Mitochondrial translationmitochondrial translation termination factorsmitoribosomes

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Area of Science:

  • Mitochondrial biology
  • Molecular genetics
  • Protein synthesis

Background:

  • Mitochondrial translation synthesizes key oxidative phosphorylation proteins.
  • Accurate protein production requires precise translation termination.
  • Dedicated factors control mitochondrial translation termination.

Purpose of the Study:

  • To review current knowledge on mitochondrial translation termination in humans.
  • To emphasize the structural and functional aspects of mtRF1 and mtRF1a.
  • To provide a comprehensive overview of these critical termination factors.

Main Methods:

  • Literature review of mitochondrial translation termination.
  • Analysis of structural data for termination factors.
  • Examination of molecular functions of mtRF1 and mtRF1a.

Main Results:

  • Mitochondrial translation termination involves specific factors.
  • mtRF1 and mtRF1a are key players in this process.
  • Their structures and functions are crucial for accuracy.

Conclusions:

  • Understanding mtRF1 and mtRF1a is vital for mitochondrial health.
  • These factors ensure efficient and correct protein synthesis.
  • Further research can elucidate their roles in disease.