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Peroxisomes

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...

Peroxisomes

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...

Peroxisomes

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...

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...

Autoxidation of Ethers to Peroxides and Hydroperoxides

Autoxidation of Ethers to Peroxides and Hydroperoxides

Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.

Pyruvate Oxidation

Pyruvate Oxidation

After glycolysis, the charged pyruvate molecules enter the mitochondria via active transport and undergo three enzymatic reactions. These reactions ensure that pyruvate can enter the next metabolic pathway so that energy stored in the pyruvate molecules can be harnessed by the cells.
First, the enzyme pyruvate dehydrogenase removes the carboxyl group from pyruvate and releases it as carbon dioxide. The stripped molecule is then oxidized and releases electrons, which are then picked up by NAD+...

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Related Experiment Video

Updated: Jun 22, 2026

Monitoring Stub1-Mediated Pexophagy

Monitoring Stub1-Mediated Pexophagy

Published on: May 12, 2023

How peroxisomes multiply.

Ewald H Hettema¹, Alison M Motley

¹Department of Molecular Biology and Biotechnology, University of Sheffield, Firth Court, Western Bank, Sheffield S10 2TN, UK. e.hettema@sheffield.ac.uk

Journal of Cell Science

|July 3, 2009

Summary

This summary is machine-generated.

Peroxisomes duplicate during cell division using various mechanisms. Recent findings link them to the endoplasmic reticulum and coordinated biogenesis with mitochondria, revealing new cellular organization insights.

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Area of Science:

Cell Biology
Organelle Biogenesis
Endomembrane System Dynamics

Background:

Peroxisomes are essential organelles involved in cellular metabolism.
Their duplication and segregation occur during cell division.
Historically, peroxisome biogenesis was less understood compared to other organelles.

Purpose of the Study:

To review the diverse mechanisms of peroxisome multiplication.
To highlight the molecular machinery governing peroxisome duplication.
To discuss the integration of peroxisomes within the broader cellular context, including their relationship with the endoplasmic reticulum and mitochondria.

Main Methods:

Literature review of peroxisome biogenesis and function.
Analysis of recent findings on peroxisome membrane acquisition.
Comparison of peroxisome and mitochondrial multiplication factors.

Main Results:

Peroxisomes multiply through distinct pathways.
Membrane constituents are sourced from the endoplasmic reticulum, integrating peroxisomes into the endomembrane system.
Coordinated biogenesis between peroxisomes and mitochondria is observed, with shared multiplication factors.

Conclusions:

Peroxisome multiplication involves multiple, specific mechanisms.
Peroxisomes are now recognized as a dynamic component of the endomembrane system.
Inter-organelle communication and coordination in biogenesis, particularly with mitochondria, are crucial for cellular organization.