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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...

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Updated: Sep 17, 2025

Translating Ribosome Affinity Purification TRAP to Investigate Arabidopsis thaliana Root Development at a Cell Type-Specific Scale

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Identifying and characterizing a missing peroxin-PEX8-in Arabidopsis thaliana.

Gabrielle C Buck¹, Ashley D Weeks¹, Niamh E Ordner¹

¹Department of Biosciences, Rice University, Houston, TX77005, USA.

|June 27, 2025

Summary

Scientists found that Arabidopsis PEX8 protein is functionally equivalent to yeast Pex8, revealing conserved peroxisomal protein import machinery across eukaryotes. This suggests other yeast-specific peroxins may exist in plants and mammals with low sequence conservation.

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Published on: May 14, 2020

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Fluorescence-microscopy Screening and Next-generation Sequencing: Useful Tools for the Identification of Genes Involved in Organelle Integrity

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Published on: April 13, 2012

Area of Science:

Cell Biology
Plant Biology
Biochemistry

Background:

Peroxisomes are vital organelles involved in various metabolic processes.
Protein import into peroxisomes relies on peroxins (PEX proteins), largely conserved across species.
Yeast Pex8, crucial for lumenal protein import, was previously thought to be fungi-specific.

Purpose of the Study:

To investigate the function of an uncharacterized Arabidopsis thaliana protein with structural similarity to yeast Pex8.
To determine if the peroxisomal protein import machinery is conserved between yeast and plants.

Main Methods:

Bioinformatic analysis to predict structural similarity and targeting signals.
Generation of pex8 mutant and artificial microRNA lines in Arabidopsis.
Assessing lumenal protein import and physiological defects in peroxisome-deficient plants.
Fluorescent reporter localization studies within peroxisomes.

Main Results:

Arabidopsis PEX8 shares structural features with yeast Pex8, including HEAT repeats and targeting signals.
pex8 mutations were lethal, and PEX8 knockdown impaired lumenal protein import and caused peroxisome dysfunction.
Fluorescently tagged PEX8 localized to peroxisomal membranes.

Conclusions:

Arabidopsis PEX8 is functionally equivalent to yeast Pex8, demonstrating conservation of a key peroxisomal protein import factor.
This finding highlights the conservation of peroxisomal protein import machinery across eukaryotes.
It suggests that other "yeast-specific" peroxins might be present in plants and mammals but have evaded detection due to low sequence homology.