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Related Concept Videos

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,...
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...
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...
Proteomics01:33

Proteomics

A proteome is the entire set of proteins that a cell type produces. We can study proteomes using the knowledge of genomes because genes code for mRNAs, and the mRNAs encode proteins. Although mRNA analysis is a step in the right direction, not all mRNAs are translated into proteins.
Proteomics is the study of proteomes' function. It involves the large-scale systematic study of the proteome to denote the protein complement expressed by a genome. Scientist Mark Wilkins coined the term proteomics...
Mitochondrial Membranes01:45

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...

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Related Experiment Video

Updated: Jun 12, 2026

Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification
09:04

Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification

Published on: June 2, 2023

The approaches for manipulating mitochondrial proteome.

Inna N Shokolenko1, Mikhail F Alexeyev, Susan P LeDoux

  • 1University of South Alabama, Mobile, Alabama, USA.

Environmental and Molecular Mutagenesis
|June 15, 2010
PubMed
Summary
This summary is machine-generated.

This review explores methods for introducing proteins into mitochondria, crucial for cellular function and disease. Understanding these protein delivery strategies is key for developing new mitochondrial therapies.

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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
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A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

Published on: March 13, 2014

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples
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Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples

Published on: May 3, 2024

Related Experiment Videos

Last Updated: Jun 12, 2026

Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification
09:04

Two-Step Tag-Free Isolation of Mitochondria for Improved Protein Discovery and Quantification

Published on: June 2, 2023

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry
08:04

A New Approach for the Comparative Analysis of Multiprotein Complexes Based on 15N Metabolic Labeling and Quantitative Mass Spectrometry

Published on: March 13, 2014

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples
05:45

Isolation of Mitochondria for Mitochondrial Supercomplex Analysis from Small Tissue and Cell Culture Samples

Published on: May 3, 2024

Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Medicine

Background:

  • Mitochondria are vital for cellular energy, metabolism, and programmed cell death.
  • Mitochondrial dysfunction is linked to numerous diseases, including metabolic disorders, neurodegeneration, and cancer.
  • Modulating mitochondrial function via protein manipulation offers therapeutic potential.

Purpose of the Study:

  • To review current strategies for introducing proteins into mitochondria.
  • To discuss the challenges and complexities of mitochondrial protein targeting.

Main Methods:

  • Nuclear expression strategies: overexpression, allotopic expression, and xenotopic expression.
  • Antigenomic and progenomic approaches for mtDNA maintenance proteins.
  • Direct delivery of purified proteins to mitochondria.

Main Results:

  • Multiple methods exist for nuclear gene expression and subsequent mitochondrial targeting.
  • Specific strategies are being developed for delivering nuclear-encoded and even xenotopic proteins.
  • Challenges remain in efficient and accurate targeting of exogenous proteins.

Conclusions:

  • Developing effective protein delivery systems for mitochondria is critical for therapeutic advancements.
  • Targeting mitochondrial proteins offers a promising avenue for treating various pathologies.
  • Further research into protein targeting mechanisms is essential.