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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...

Peroxisomes

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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...

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Related Experiment Video

Updated: Jun 18, 2026

Monitoring Stub1-Mediated Pexophagy

Monitoring Stub1-Mediated Pexophagy

Published on: May 12, 2023

A dual function for Pex3p in peroxisome formation and inheritance.

Joanne M Munck¹, Alison M Motley, James M Nuttall

¹Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, England, UK.

The Journal of Cell Biology

|December 2, 2009

Summary

Saccharomyces cerevisiae Pex3p protein has two roles: peroxisome formation and segregation. It anchors Inp1p at the peroxisomal membrane for segregation, independent of its ER function in biogenesis.

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Area of Science:

Cell Biology
Molecular Biology
Biochemistry

Background:

Pex3p in Saccharomyces cerevisiae is known to function in de novo peroxisome formation at the endoplasmic reticulum (ER).
The steady-state localization and precise function of Pex3p at the peroxisomal membrane remain subjects of debate.

Purpose of the Study:

To elucidate the dual functions of Pex3p in peroxisome biogenesis and segregation.
To investigate the interaction between Pex3p and the peroxisome retention factor Inp1p.

Main Methods:

In vitro and in vivo interaction studies between Pex3p and Inp1p.
Split-green fluorescent protein (GFP) analysis to determine the site of protein interaction.
Generation and analysis of PEX3 alleles with defects in Inp1p recruitment and peroxisome segregation.

Main Results:

Pex3p exhibits a dual function in both peroxisome formation and peroxisome segregation.
Physical interaction between Pex3p and Inp1p was confirmed at the peroxisomal membrane.
Mutant PEX3 alleles impaired in Inp1p recruitment also showed defects in peroxisome segregation.

Conclusions:

Pex3p acts as a crucial anchor for Inp1p at the peroxisomal membrane, facilitating peroxisome segregation.
This anchoring function of Pex3p is distinct and independent from its role in ER-mediated peroxisome biogenesis.