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Related Concept Videos

Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
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,...
Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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.
Transport of mitochondrial precursors across the TIM23 channel is driven by...
Protein Translocation Machinery on the ER Membrane01:28

Protein Translocation Machinery on the ER Membrane

The translocon complex situated on the ER membrane is the main gateway for the protein secretory pathway. It facilitates the transport of nascent peptides into the ER lumen and their insertion into the ER membrane.
Sec61 protein conducting channel
In eukaryotes, the translocon complex comprises a core heterotrimeric translocator channel called the Sec61 complex. This channel includes three transmembrane proteins, Sec61α, Sec61β, and Sec61γ, and is the largest subunit of the translocon complex.
Peroxisomes01:30

Peroxisomes

Peroxisomes and mitochondria are two important oxygen-utilizing organelles in eukaryotic cells. Mitochondria carry out cellular respiration—the process that converts energy from food into ATP. Peroxisomes carry out a variety of functions, primarily breaking down different substances, such as fatty acids.The peroxisome is a single membrane-bound cellular organelle that can perform several different functions, including lipid metabolism and chemical detoxification. The enzymes within peroxisomes...
Peroxisomes01:24

Peroxisomes

Peroxisomes are specialized organelles present in fungi, plant, and animal cells. It can vary in number, size, morphology, and activity depending on the type of tissue and the nutritional state of the cell. For example, cells with active lipid metabolism, such as adipocytes, neurons, and hepatocytes, have more peroxisomes than other cells in the body. Besides their primary role in breaking down complex organic molecules, peroxisomes can also synthesize specific macromolecules and participate in...

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Peroxisomal interactome mapping enables network-based modelling of function and disease.

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Evolutionary remodeling of a remnant GET pathway factor into PEX38, an essential peroxin.

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Related Experiment Video

Updated: Jun 17, 2026

Monitoring Stub1-Mediated Pexophagy
08:26

Monitoring Stub1-Mediated Pexophagy

Published on: May 12, 2023

Peroxisomal protein translocation.

Wolfgang Girzalsky1, Delia Saffian, Ralf Erdmann

  • 1Abteilung für Systembiochemie, Medizinische Fakultät der Ruhr-Universität Bochum, D-44780 Bochum, Germany.

Biochimica Et Biophysica Acta
|January 19, 2010
PubMed
Summary

Peroxisome biogenesis involves membrane formation, matrix enzyme import, and organelle proliferation. This review details the topogenesis of peroxisomal membrane proteins and matrix protein import mechanisms.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Peroxisomes are vital organelles in eukaryotic cells, executing diverse metabolic functions.
  • Defects in peroxisome biogenesis lead to severe, often fatal, peroxisome biogenesis disorders.
  • Peroxisome formation requires coordinated processes including membrane synthesis, protein import, and proliferation.

Purpose of the Study:

  • To review the current understanding of peroxisome biogenesis.
  • To focus on the mechanisms of peroxisomal membrane protein topogenesis.
  • To elucidate the pathways for matrix protein import into peroxisomes.

Main Methods:

  • Review of existing literature on peroxisome biogenesis.
  • Analysis of protein targeting signals and pathways.

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Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

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Reconstitution of Msp1 Extraction Activity with Fully Purified Components
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Reconstitution of Msp1 Extraction Activity with Fully Purified Components

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Monitoring Stub1-Mediated Pexophagy
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Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes
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Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

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  • Discussion of the roles of known peroxins (PEX-genes).

    • Main Results:

    • Identified 32 known peroxins involved in conserved biogenesis pathways from yeast to humans.
    • Detailed the distinct mechanisms for targeting membrane proteins versus matrix enzymes.
    • Highlighted the complexity and conservation of peroxisome assembly.

    Conclusions:

    • Peroxisome biogenesis is a complex, multi-step process essential for cellular function.
    • Understanding protein topogenesis and import is crucial for addressing peroxisome-related disorders.
    • Continued research into peroxins and their functions will advance cell biology and medicine.