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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...

Oxidation of Phenols to Quinones

Oxidation of Phenols to Quinones

In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox property is crucial in...

Radical Autoxidation

Radical Autoxidation

The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...

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...

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Related Experiment Video

Updated: Jul 19, 2026

Measurement of Fatty Acid β-Oxidation in a Suspension of Freshly Isolated Mouse Hepatocytes

Measurement of Fatty Acid β-Oxidation in a Suspension of Freshly Isolated Mouse Hepatocytes

Published on: September 9, 2021

Pathophysiology of peroxisomal beta-oxidation.

J Vamecq¹, J P Draye

¹Laboratoire de Chimie Physiologique, International Institute of Cellular and Molecular Pathology, Brussels, Belgium.

Essays in Biochemistry

|January 1, 1989

Summary

Mammalian peroxisomes are vital organelles for metabolism, including hydrogen peroxide breakdown and lipid synthesis. Studying peroxisomal disorders has revealed novel enzymes and pathways, advancing our understanding of cell biology.

Area of Science:

Cell Biology
Biochemistry
Genetics

Background:

Mammalian peroxisomes are crucial subcellular organelles.
They are involved in diverse metabolic processes like hydrogen peroxide metabolism and lipid biosynthesis.
Unlike mitochondria, peroxisomes lack DNA and replicate via division.

Purpose of the Study:

To elucidate the multifaceted functions of mammalian peroxisomes.
To highlight the methodologies employed in studying peroxisomal physiology.
To underscore the impact of genetic disorders and molecular biology on peroxisome research.

Main Methods:

Biochemical assays for enzyme activity.
Morphological analysis using specialized techniques.
Isolation of peroxisomes through specific procedures.

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Monitoring Stub1-Mediated Pexophagy

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Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

Published on: December 19, 2025

Related Experiment Videos

Last Updated: Jul 19, 2026

Measurement of Fatty Acid β-Oxidation in a Suspension of Freshly Isolated Mouse Hepatocytes

Measurement of Fatty Acid β-Oxidation in a Suspension of Freshly Isolated Mouse Hepatocytes

Published on: September 9, 2021

Monitoring Stub1-Mediated Pexophagy

Monitoring Stub1-Mediated Pexophagy

Published on: May 12, 2023

Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

Peroxisome Staining in Mammalian Cells Using Peroxisome-Specific Probes

Published on: December 19, 2025

Study of inborn errors of metabolism.

Main Results:

Peroxisomes play key roles in hydrogen peroxide metabolism, lipid metabolism, and intermediary metabolism.
Novel enzymes and metabolic pathways within peroxisomes have been identified.
Human genetic disorders affecting peroxisomal functions have been recognized.

Conclusions:

The study of peroxisomal physiology has significantly advanced through combined isolation, enzyme assays, and morphological analysis.
Molecular biology and the study of metabolic disorders have been instrumental in uncovering new peroxisomal functions.
Research continues to reveal the complexity and importance of peroxisomes in cellular health and disease.