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Protein Import into the Peroxisomes

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 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,...

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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Nuclear Localization Signals and Import

Nuclear Localization Signals and Import

Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of 2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...

Protein Transport into the Inner Mitochondrial Membrane

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Related Experiment Video

Updated: Mar 30, 2026

Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

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Published on: December 19, 2025

Covalent Label Transfer between Peroxisomal Importomer Components Reveals Export-driven Import Interactions.

Moninder S Bhogal¹, Thomas Lanyon-Hogg², Katherine A Johnston¹

¹From the Centre for Plant Sciences and School of Molecular and Cellular Biology and.

The Journal of Biological Chemistry

|November 15, 2015

Summary

A new covalent biotin label transfer method analyzes peroxisomal protein import. This technique revealed the PEX5 receptor interacts with import machinery in an ATP-dependent manner, independent of cargo.

Keywords:

Arabidopsis PEX14 PEX5 biotinylation peroxisome protein chemical modification protein import protein-protein interaction

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Published on: October 20, 2023

Area of Science:

Cell Biology
Biochemistry
Molecular Biology

Background:

Peroxisomes are essential organelles in eukaryotic cells, requiring protein import from the cytosol.
In vitro import studies are crucial for understanding peroxisomal protein targeting.
Traditional methods like protease protection have limitations in studying specific protein interactions during import.

Purpose of the Study:

To develop and apply a novel covalent biotin label transfer method for analyzing peroxisomal protein import.
To investigate the import mechanism of an N-terminally truncated PEX5 (PEX5C) receptor construct into sunflower peroxisomes.
To elucidate the nature of interactions between PEX5C and the peroxisomal import machinery.

Main Methods:

Development of a covalent biotin label transfer assay for in vitro peroxisomal import.
Utilizing the assay to study the import of PEX5C and its interactions.
Employing competition experiments to identify specific protein-protein interactions during import.

Main Results:

The label transfer method confirmed PEX5C is monomeric during import assays.
It identified the PEX5-PEX14 interaction as an early step in the import process.
PEX5C interaction with the import machinery is ATP-dependent and independent of cargo protein.

Conclusions:

Covalent biotin label transfer is a powerful technique for studying protein interactions in peroxisomal import.
The PEX5-PEX14 interaction is a key early event in peroxisomal import.
The interaction between PEX5C and the import machinery is regulated by ATP and cargo presence.