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Related Concept Videos

Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

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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...
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Structure of Porins01:21

Structure of Porins

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Mitochondria, chloroplasts, and gram-negative bacteria have transmembrane, beta-barrel proteins called porins to mediate the free diffusion of ions and metabolites across the membrane. Mitochondrial porin precursors contain conserved amino acid sequences called beta signals at their C-terminal. Beta signals have a  motif of PoXGXXHyXHy (Po-Polar, X-Any amino acid, G-Glycine, Hy-LargeHydrophobic), which are crucial for precursor recognition to initiate precursor assembly. Beta-barrel...
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Protein Transport into the Inner Mitochondrial Membrane01:34

Protein Transport into the Inner Mitochondrial Membrane

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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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Porin Insertion in the Outer Mitochondrial Membrane01:12

Porin Insertion in the Outer Mitochondrial Membrane

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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.
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Peroxisomes01:24

Peroxisomes

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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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Peroxisomes01:24

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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

Published on: December 19, 2025

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Peroxisomal protein import pores.

Michael Meinecke1, Philipp Bartsch2, Richard Wagner2

  • 1Department of Cellular Biochemistry, University Medical Centre Göttingen, 37073 Göttingen, Germany; European Neuroscience Institute Göttingen, 37073 Göttingen, Germany.

Biochimica Et Biophysica Acta
|October 27, 2015
PubMed
Summary

Peroxisomal protein import utilizes a unique, water-filled pore formed by Pex5 and Pex14. This review details the discovery and features of this protein translocation channel.

Keywords:
ChannelsPeroxisomesProtein importProtein traffickingTranslocation pores

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Peroxisomal protein import differs significantly from other organelle protein translocation pathways.
  • The mechanisms for importing folded or oligomerized proteins across the peroxisomal membrane are not fully understood.

Purpose of the Study:

  • To review the research leading to the identification of the peroxisomal protein import pore.
  • To discuss the biophysical characteristics of this pore and compare it to other protein translocation channels.

Main Methods:

  • Literature review of studies on peroxisomal protein import.
  • Analysis of the composition and proposed structure of the peroxisomal translocation pore.
  • Comparative analysis of the peroxisomal pore with other known protein channels.

Main Results:

  • Identification of a water-filled pore primarily composed of Pex5 and Pex14.
  • Evidence suggests this pore acts as a large, potentially transient, protein-conducting channel.
  • The pore exhibits distinct biophysical features compared to other translocation channels.

Conclusions:

  • The Pex5/Pex14 pore represents a novel mechanism for protein translocation across the peroxisomal membrane.
  • Further research is needed to fully elucidate the dynamics and regulation of this import pathway.